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class="offcanvas__section-toggle" id="Shortcuts_25_control" type="button" aria-label="Shortcuts submenu" aria-controls="Shortcuts_25_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Shortcuts_25_section" class="offcanvas__list" data-level="5" aria-labelledby="Shortcuts_25_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/acs/documentation/instrument-science-reports-isrs' class="offcanvas__section-link" target='_parent' >ACS ISRs</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/documentation/stsci-analysis-newsletter-stan' class="offcanvas__section-link" target='_parent' >ACS STANs</a></li><li class="offcanvas__item noChildren"><a href='http://etc.stsci.edu/etc/input/acs/imaging/' class="offcanvas__section-link" target='_blank' >ACS Imaging ETC</a></li><li class="offcanvas__item noChildren"><a href='http://etc.stsci.edu/etc/input/acs/spectroscopic/' class="offcanvas__section-link" target='_blank' >ACS Spectroscopic ETC</a></li><li class="offcanvas__item noChildren"><a href='http://etc.stsci.edu/etc/input/acs/rampfilter/' class="offcanvas__section-link" target='_blank' >ACS Ramp Filter ETC</a></li><li class="offcanvas__item noChildren"><a href='/hst/proposing' class="offcanvas__section-link" target='_self' >HST Proposing</a></li><li class="offcanvas__item noChildren"><a href='/hst/proposing/phase-i' class="offcanvas__section-link" target='_blank' >Phase I Proposals</a></li><li class="offcanvas__item noChildren"><a href='/hst/proposing/phase-ii' class="offcanvas__section-link" target='_self' >Phase II Proposal</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='https://hst-docs.stsci.edu/display/HSP/The+Hubble+Space+Telescope+Primer+for+Cycle+32' class="offcanvas__section-link" target='_blank' >HST Cycle 32 Primer</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/cos' class="offcanvas__section-link" >Cosmic Origins Spectrograph</a><button class="offcanvas__section-toggle" id="Cosmic_Origins_Spectrograph_26_control" type="button" aria-label="Cosmic Origins Spectrograph submenu" aria-controls="Cosmic_Origins_Spectrograph_26_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Cosmic_Origins_Spectrograph_26_section" class="offcanvas__list" data-level="4" aria-labelledby="Cosmic_Origins_Spectrograph_26_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/cos/instrument-design' class="offcanvas__section-link" >Instrument Design</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/cos/performance' class="offcanvas__section-link" >Performance</a><button class="offcanvas__section-toggle" id="Performance_27_control" type="button" aria-label="Performance submenu" aria-controls="Performance_27_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Performance_27_section" class="offcanvas__list" data-level="5" aria-labelledby="Performance_27_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/cos/performance/monitoring' class="offcanvas__section-link" >Monitoring</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/performance/sensitivity' class="offcanvas__section-link" >Sensitivity</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/cos/performance/spectral-resolution' class="offcanvas__section-link" >Spectral Resolution and Line Spread Functions</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/cos/proposing' class="offcanvas__section-link" >Proposing</a><button class="offcanvas__section-toggle" id="Proposing_28_control" type="button" aria-label="Proposing submenu" aria-controls="Proposing_28_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Proposing_28_section" class="offcanvas__list" data-level="5" aria-labelledby="Proposing_28_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/cos/proposing/cos2025-policies' class="offcanvas__section-link" >COS2025 Policies</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/proposing/observing-strategies' class="offcanvas__section-link" >Observing Strategies</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/cos/proposing/wavelength-tool' class="offcanvas__section-link" >Wavelength Tool</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/data-analysis--software-tools' class="offcanvas__section-link" >Data Analysis & Software Tools</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/cos/calibration' class="offcanvas__section-link" >Calibration</a><button class="offcanvas__section-toggle" 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class="offcanvas__section-link" >Cycle 30 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-29-calibration-plan' class="offcanvas__section-link" >Cycle 29 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-28-calibration-plan' class="offcanvas__section-link" >Cycle 28 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-27-calibration-plan' class="offcanvas__section-link" >Cycle 27 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-26-calibration-plan' class="offcanvas__section-link" >Cycle 26 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-25-calibration-plan' class="offcanvas__section-link" >Cycle 25 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-24-calibration-plan' class="offcanvas__section-link" >Cycle 24 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-23-calibration-plan' class="offcanvas__section-link" >Cycle 23 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-22-calibration-plan' class="offcanvas__section-link" >Cycle 22 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-21-calibration-plan' class="offcanvas__section-link" >Cycle 21 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-20-calibration-plan' class="offcanvas__section-link" >Cycle 20 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-19-calibration-plan' class="offcanvas__section-link" >Cycle 19 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-18-calibration-plan' class="offcanvas__section-link" >Cycle 18 Calibration Plan</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/cos/calibration/cycle-17-calibration-plan' class="offcanvas__section-link" >Cycle 17 Calibration Plan</a></li></ul></li><li class="offcanvas__item hasChildren lastInLevel"><a href='/hst/instrumentation/cos/documentation' class="offcanvas__section-link" >Documentation</a><button class="offcanvas__section-toggle" id="Documentation_30_control" type="button" aria-label="Documentation submenu" aria-controls="Documentation_30_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Documentation_30_section" class="offcanvas__list" data-level="5" aria-labelledby="Documentation_30_control"><li class="offcanvas__item noChildren firstInLevel"><a href='https://hst-docs.stsci.edu/display/COSIHB' class="offcanvas__section-link" target='_blank' >COS Instrument Handbook</a></li><li class="offcanvas__item noChildren"><a href='https://hst-docs.stsci.edu/display/COSDHB' class="offcanvas__section-link" target='_blank' >COS Data Handbook</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/documentation/instrument-science-reports-isrs' class="offcanvas__section-link" >Instrument Science Reports (ISRs)</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/documentation/stsci-analysis-newsletter-stan' class="offcanvas__section-link" >STScI Analysis Newsletter (STAN)</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/documentation/exception-report-instructions' class="offcanvas__section-link" >Exception Report Instructions</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/documentation/conference-posters' class="offcanvas__section-link" >Conference Posters</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/documentation/calcos-release-notes' class="offcanvas__section-link" >CalCOS Release Notes</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/cos/documentation/notebooks' class="offcanvas__section-link" >Notebooks</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/fgs' class="offcanvas__section-link" >Fine Guidance Sensors</a><button class="offcanvas__section-toggle" id="Fine_Guidance_Sensors_31_control" type="button" aria-label="Fine Guidance Sensors submenu" aria-controls="Fine_Guidance_Sensors_31_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Fine_Guidance_Sensors_31_section" class="offcanvas__list" data-level="4" aria-labelledby="Fine_Guidance_Sensors_31_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/fgs/history' class="offcanvas__section-link" >History</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/fgs/instrument-design' class="offcanvas__section-link" >Instrument Design</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/fgs/performance' class="offcanvas__section-link" >Performance</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/fgs/proposing' class="offcanvas__section-link" >Proposing</a></li><li 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href='/hst/instrumentation/fgs/documentation' class="offcanvas__section-link" >Documentation</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/stis' class="offcanvas__section-link" >Space Telescope Imaging Spectrograph</a><button class="offcanvas__section-toggle" id="Space_Telescope_Imaging_Spectrograph_33_control" type="button" aria-label="Space Telescope Imaging Spectrograph submenu" aria-controls="Space_Telescope_Imaging_Spectrograph_33_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Space_Telescope_Imaging_Spectrograph_33_section" class="offcanvas__list" data-level="4" aria-labelledby="Space_Telescope_Imaging_Spectrograph_33_control"><li class="offcanvas__item hasChildren firstInLevel"><a href='/hst/instrumentation/stis/instrument-design' class="offcanvas__section-link" >Instrument Design</a><button class="offcanvas__section-toggle" id="Instrument_Design_34_control" type="button" aria-label="Instrument Design submenu" aria-controls="Instrument_Design_34_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Instrument_Design_34_section" class="offcanvas__list" data-level="5" aria-labelledby="Instrument_Design_34_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/stis/instrument-design/apertures' class="offcanvas__section-link" >Apertures</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/instrument-design/detectors' class="offcanvas__section-link" >Detectors</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/instrument-design/filters' class="offcanvas__section-link" >Filters</a></li><li class="offcanvas__item hasChildren lastInLevel"><a href='/hst/instrumentation/stis/instrument-design/gratings--prism' class="offcanvas__section-link" >Gratings / Prism</a><button class="offcanvas__section-toggle" id="Gratings_-_Prism_35_control" type="button" aria-label="Gratings / Prism submenu" aria-controls="Gratings_-_Prism_35_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Gratings_-_Prism_35_section" class="offcanvas__list" data-level="6" aria-labelledby="Gratings_-_Prism_35_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/hst/instrumentation/stis/instrument-design/gratings--prism/spectral-format-plots' class="offcanvas__section-link" >Spectral Format Plots</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/stis/performance' class="offcanvas__section-link" >Performance</a><button class="offcanvas__section-toggle" id="Performance_36_control" type="button" aria-label="Performance submenu" aria-controls="Performance_36_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Performance_36_section" class="offcanvas__list" data-level="5" aria-labelledby="Performance_36_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/stis/performance/anomalies' class="offcanvas__section-link" >Anomalies</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/performance/image-quality' class="offcanvas__section-link" >Image Quality</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/performance/monitoring' class="offcanvas__section-link" >Monitoring</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/performance/sensitivity' class="offcanvas__section-link" >Sensitivity</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/performance/spectral-resolution' class="offcanvas__section-link" >Spectral Resolution</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/performance/throughput' class="offcanvas__section-link" >Throughput</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/stis/performance/background-noise' class="offcanvas__section-link" >Background Noise</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/stis/proposing' class="offcanvas__section-link" >Proposing</a><button class="offcanvas__section-toggle" id="Proposing_37_control" type="button" aria-label="Proposing submenu" aria-controls="Proposing_37_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Proposing_37_section" class="offcanvas__list" data-level="5" aria-labelledby="Proposing_37_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/stis/proposing/go-wavecal-aperture-selection' class="offcanvas__section-link" >GO Wavecal Aperture Selection</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/stis/proposing/exception-reports' class="offcanvas__section-link" >Exception Reports</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/stis/observing-strategies' class="offcanvas__section-link" >Observing Strategies</a><button class="offcanvas__section-toggle" id="Observing_Strategies_38_control" type="button" aria-label="Observing Strategies submenu" aria-controls="Observing_Strategies_38_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Observing_Strategies_38_section" class="offcanvas__list" data-level="5" aria-labelledby="Observing_Strategies_38_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/stis/observing-strategies/target-acquisition' class="offcanvas__section-link" >Target Acquisition</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/observing-strategies/spectroscopy' class="offcanvas__section-link" >Spectroscopy</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/observing-strategies/imaging' class="offcanvas__section-link" >Imaging</a></li><li class="offcanvas__item hasChildren lastInLevel"><a href='/hst/instrumentation/stis/observing-strategies/available-modes' class="offcanvas__section-link" >Available Modes</a><button class="offcanvas__section-toggle" id="Available_Modes_39_control" type="button" aria-label="Available Modes submenu" aria-controls="Available_Modes_39_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Available_Modes_39_section" class="offcanvas__list" data-level="6" aria-labelledby="Available_Modes_39_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/stis/observing-strategies/available-modes/high-contrast-coronagraphy-at-small-inner-working-angles-with-bar5' class="offcanvas__section-link" >High Contrast Coronagraphy at Small Inner Working Angles with BAR5</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/stis/observing-strategies/available-modes/stis-bar5' class="offcanvas__section-link" >STIS BAR5</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/stis/data-analysis-and-software-tools' class="offcanvas__section-link" >Data Analysis and Software Tools</a><button class="offcanvas__section-toggle" id="Data_Analysis_and_Software_Tools_40_control" type="button" aria-label="Data Analysis and Software Tools submenu" aria-controls="Data_Analysis_and_Software_Tools_40_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Data_Analysis_and_Software_Tools_40_section" class="offcanvas__list" data-level="5" aria-labelledby="Data_Analysis_and_Software_Tools_40_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/hst/instrumentation/stis/data-analysis-and-software-tools/pixel-based-cti' class="offcanvas__section-link" >Pixel Based CTI</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/calibration' class="offcanvas__section-link" >Calibration</a></li><li class="offcanvas__item hasChildren"><a 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class="offcanvas__section-link" >STScI Analysis Newsletter (STAN)</a></li><li class="offcanvas__item noChildren"><a href='https://hst-docs.stsci.edu/stisihb' class="offcanvas__section-link" target='_blank' >STIS Instrument Handbook</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='https://hst-docs.stsci.edu/stisdhb' class="offcanvas__section-link" target='_blank' >STIS Data Handbook</a></li></ul></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/stis/flux-recalibration' class="offcanvas__section-link" >Flux Recalibration</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/wfc3' class="offcanvas__section-link" >Wide Field Camera 3</a><button class="offcanvas__section-toggle" id="Wide_Field_Camera_3_42_control" type="button" aria-label="Wide Field Camera 3 submenu" aria-controls="Wide_Field_Camera_3_42_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Wide_Field_Camera_3_42_section" class="offcanvas__list" data-level="4" aria-labelledby="Wide_Field_Camera_3_42_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/wfc3/instrument-design' class="offcanvas__section-link" >Instrument Design</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/wfc3/performance' class="offcanvas__section-link" >Performance</a><button class="offcanvas__section-toggle" id="Performance_43_control" type="button" aria-label="Performance submenu" aria-controls="Performance_43_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Performance_43_section" class="offcanvas__list" data-level="5" aria-labelledby="Performance_43_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/wfc3/performance/usage-statistics' class="offcanvas__section-link" >Usage Statistics</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/performance/anomalies' class="offcanvas__section-link" >Anomalies</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/performance/cte' class="offcanvas__section-link" >CTE</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/performance/ground-testing' class="offcanvas__section-link" >Ground Testing</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/wfc3/performance/monitoring' class="offcanvas__section-link" >Monitoring</a><button 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href='/hst/instrumentation/wfc3/performance/cal-subsystem' class="offcanvas__section-link" >Cal Subsystem</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/wfc3/proposing' class="offcanvas__section-link" >Proposing</a><button class="offcanvas__section-toggle" id="Proposing_45_control" type="button" aria-label="Proposing submenu" aria-controls="Proposing_45_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Proposing_45_section" class="offcanvas__list" data-level="5" aria-labelledby="Proposing_45_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/wfc3/proposing/dithering-strategies' class="offcanvas__section-link" >Dithering Strategies</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/wfc3/proposing/exception-reports' class="offcanvas__section-link" >Exception Reports</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/wfc3/data-analysis' class="offcanvas__section-link" >Data Analysis</a><button class="offcanvas__section-toggle" id="Data_Analysis_46_control" type="button" aria-label="Data Analysis submenu" aria-controls="Data_Analysis_46_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Data_Analysis_46_section" class="offcanvas__list" data-level="5" aria-labelledby="Data_Analysis_46_control"><li class="offcanvas__item noChildren firstInLevel"><a href='https://github.com/spacetelescope/WFC3Library/tree/master/notebooks/filter_transformations' class="offcanvas__section-link" target='_blank' >Color Conversion Notebook</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/data-analysis/full-well-depth' class="offcanvas__section-link" >Full Well Depth</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/documentation/grism-resources' class="offcanvas__section-link" >Grism Spectroscopy</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/wfc3/data-analysis/ir-flats' class="offcanvas__section-link" >IR Flats</a><button class="offcanvas__section-toggle" id="IR_Flats_47_control" type="button" aria-label="IR Flats submenu" aria-controls="IR_Flats_47_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="IR_Flats_47_section" class="offcanvas__list" data-level="6" aria-labelledby="IR_Flats_47_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/hst/instrumentation/wfc3/data-analysis/ir-flats/blob-delta-flats-from-earth-flat-calibration-images' class="offcanvas__section-link" >Blob Delta-flats from Earth Flat Calibration Images</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/data-analysis/ir-persistence' class="offcanvas__section-link" >IR Persistence</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/wfc3/data-analysis/photometric-calibration' class="offcanvas__section-link" >Photometric Calibration</a><button class="offcanvas__section-toggle" id="Photometric_Calibration_48_control" type="button" aria-label="Photometric Calibration submenu" aria-controls="Photometric_Calibration_48_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Photometric_Calibration_48_section" class="offcanvas__list" data-level="6" aria-labelledby="Photometric_Calibration_48_control"><li class="offcanvas__item hasChildren firstInLevel"><a href='/hst/instrumentation/wfc3/data-analysis/photometric-calibration/uvis-photometric-calibration' class="offcanvas__section-link" >UVIS Photometric Calibration</a><button class="offcanvas__section-toggle" id="UVIS_Photometric_Calibration_49_control" type="button" aria-label="UVIS Photometric Calibration submenu" aria-controls="UVIS_Photometric_Calibration_49_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="UVIS_Photometric_Calibration_49_section" class="offcanvas__list" data-level="7" aria-labelledby="UVIS_Photometric_Calibration_49_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/wfc3/data-analysis/photometric-calibration/uvis-photometric-calibration/quad-filter-photometry' class="offcanvas__section-link" >Quad Filter Photometry</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/data-analysis/photometric-calibration/uvis-photometric-calibration/uv-filter-modified-keywords' class="offcanvas__section-link" >UV Filter Modified Keywords</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/wfc3/data-analysis/photometric-calibration/uvis-photometric-calibration/previous-uvis-photometric-calibrations' class="offcanvas__section-link" >Previous UVIS Photometric Calibrations</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/data-analysis/photometric-calibration/uvis-encircled-energy' class="offcanvas__section-link" >UVIS Encircled Energy</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/wfc3/data-analysis/photometric-calibration/ir-photometric-calibration' class="offcanvas__section-link" >IR Photometric Calibration</a><button class="offcanvas__section-toggle" id="IR_Photometric_Calibration_50_control" type="button" aria-label="IR Photometric Calibration submenu" aria-controls="IR_Photometric_Calibration_50_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="IR_Photometric_Calibration_50_section" class="offcanvas__list" data-level="7" aria-labelledby="IR_Photometric_Calibration_50_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/hst/instrumentation/wfc3/data-analysis/photometric-calibration/ir-photometric-calibration/previous-ir-photometric-calibrations' class="offcanvas__section-link" >Previous IR Photometric Calibrations</a></li></ul></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/wfc3/data-analysis/photometric-calibration/ir-encircled-energy' class="offcanvas__section-link" >IR Encircled Energy</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/data-analysis/pixel-area-maps' class="offcanvas__section-link" >Pixel Area Maps</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/wfc3/data-analysis/psf' class="offcanvas__section-link" >PSF</a><button class="offcanvas__section-toggle" id="PSF_51_control" type="button" aria-label="PSF submenu" aria-controls="PSF_51_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="PSF_51_section" class="offcanvas__list" data-level="6" aria-labelledby="PSF_51_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/hst/instrumentation/wfc3/data-analysis/psf/psf-search' class="offcanvas__section-link" >PSF Search</a></li></ul></li><li class="offcanvas__item noChildren"><a href='http://archive.stsci.edu/hst/index.html' class="offcanvas__section-link" target='_blank' >Retrieving Data</a></li><li 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tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Calibration_Plan_52_section" class="offcanvas__list" data-level="5" aria-labelledby="Calibration_Plan_52_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/wfc3/calibration-plan/tv3-results' class="offcanvas__section-link" >TV3 Results</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/calibration-plan/tv2-results' class="offcanvas__section-link" >TV2 Results</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/calibration-plan/tv1-results' class="offcanvas__section-link" >TV1 Results</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/wfc3/calibration-plan/old-versions' class="offcanvas__section-link" >Old Versions</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/wfc3/software-tools' class="offcanvas__section-link" >Software Tools</a><button class="offcanvas__section-toggle" id="Software_Tools_53_control" type="button" aria-label="Software Tools submenu" aria-controls="Software_Tools_53_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Software_Tools_53_section" class="offcanvas__list" data-level="5" aria-labelledby="Software_Tools_53_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/wfc3/software-tools/crosstalk' class="offcanvas__section-link" 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class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Documentation_54_section" class="offcanvas__list" data-level="5" aria-labelledby="Documentation_54_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/wfc3/documentation/instrument-science-reports-isrs' class="offcanvas__section-link" >Instrument Science Reports (ISRs)</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/documentation/stsci-analysis-newsletter-stan' class="offcanvas__section-link" >STScI Analysis Newsletter (STAN)</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/wfc3/documentation/grism-resources' class="offcanvas__section-link" >Grism Resources</a><button class="offcanvas__section-toggle" id="Grism_Resources_55_control" type="button" aria-label="Grism Resources submenu" aria-controls="Grism_Resources_55_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Grism_Resources_55_section" class="offcanvas__list" data-level="6" aria-labelledby="Grism_Resources_55_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/wfc3/documentation/grism-resources/grism-data-analysis' class="offcanvas__section-link" >Grism Data Analysis</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/documentation/grism-resources/wfc3-ir-grism-data-reduction-cookbook' class="offcanvas__section-link" >WFC3 IR Grism Data Reduction Cookbook</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/documentation/grism-resources/grism-frequently-asked-questions' class="offcanvas__section-link" >Grism Frequently Asked Questions</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/documentation/grism-resources/ir-grism-sky-images' class="offcanvas__section-link" >IR Grism Sky Images</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/documentation/grism-resources/wfc3-g141-calibrations' class="offcanvas__section-link" >WFC3 G141 Calibrations</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/documentation/grism-resources/wfc3-g280-calibrations' class="offcanvas__section-link" >WFC3 G280 Calibrations</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/documentation/grism-resources/wfc3-g102-calibrations' class="offcanvas__section-link" >WFC3 G102 Calibrations</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/wfc3/documentation/grism-resources/uvis-grism-sky-images' class="offcanvas__section-link" >UVIS Grism Sky Images</a></li></ul></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/wfc3/documentation/conference-posters' class="offcanvas__section-link" >Conference Posters</a></li></ul></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/wfc3/news' class="offcanvas__section-link" >News</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/focus-and-pointing' class="offcanvas__section-link" >Focus and Pointing</a><button class="offcanvas__section-toggle" id="Focus_and_Pointing_56_control" type="button" aria-label="Focus and Pointing submenu" aria-controls="Focus_and_Pointing_56_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Focus_and_Pointing_56_section" class="offcanvas__list" data-level="4" aria-labelledby="Focus_and_Pointing_56_control"><li class="offcanvas__item hasChildren firstInLevel"><a href='/hst/instrumentation/focus-and-pointing/focus' class="offcanvas__section-link" >Focus</a><button class="offcanvas__section-toggle" id="Focus_57_control" type="button" aria-label="Focus submenu" aria-controls="Focus_57_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Focus_57_section" class="offcanvas__list" data-level="5" aria-labelledby="Focus_57_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/focus-and-pointing/focus/secondary-mirror-moves' class="offcanvas__section-link" >Secondary Mirror Moves</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/focus-and-pointing/focus/hst-focus-model' class="offcanvas__section-link" >HST Focus Model</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/focus-and-pointing/focus/tiny-tim-hst-psf-modeling' class="offcanvas__section-link" >Tiny Tim HST PSF Modeling</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/focus-and-pointing/pointing' class="offcanvas__section-link" >Pointing</a><button class="offcanvas__section-toggle" id="Pointing_58_control" type="button" aria-label="Pointing submenu" aria-controls="Pointing_58_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Pointing_58_section" class="offcanvas__list" data-level="5" aria-labelledby="Pointing_58_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/focus-and-pointing/pointing/jitter-file-format-definition' class="offcanvas__section-link" >Jitter File Format Definition</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/focus-and-pointing/pointing/determining-an-observations-orientation' class="offcanvas__section-link" >Determining an Observation’s Orientation</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/focus-and-pointing/fov-geometry' class="offcanvas__section-link" >FoV Geometry</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/focus-and-pointing/documentation' class="offcanvas__section-link" 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aria-controls="Reference_Data_for_Calibration_and_Tools_62_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Reference_Data_for_Calibration_and_Tools_62_section" class="offcanvas__list" data-level="4" aria-labelledby="Reference_Data_for_Calibration_and_Tools_62_control"><li class="offcanvas__item noChildren firstInLevel"><a href='https://hst-crds.stsci.edu/' class="offcanvas__section-link" target='_blank' >Calibration Reference Data System (CRDS)</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/file-and-table-structures' class="offcanvas__section-link" >File and Table Structures</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/reference-file-retreival-instructions' class="offcanvas__section-link" >Reference File Retrieval Instructions</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/legacy-instrument-reference-files' class="offcanvas__section-link" >Legacy Instrument Reference Files</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/synphot-throughput-tables' class="offcanvas__section-link" >Synphot Throughput Tables</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs' class="offcanvas__section-link" >Astronomical Catalogs</a><button class="offcanvas__section-toggle" id="Astronomical_Catalogs_63_control" type="button" aria-label="Astronomical Catalogs submenu" aria-controls="Astronomical_Catalogs_63_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Astronomical_Catalogs_63_section" class="offcanvas__list" data-level="5" aria-labelledby="Astronomical_Catalogs_63_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/the-agn-atlas' class="offcanvas__section-link" >The AGN Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/atmo-2020-atmosphere-models' class="offcanvas__section-link" >ATMO 2020 Atmosphere Models</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/brown-dwarfs-and-substellar-objects' class="offcanvas__section-link" >Brown Dwarfs and Substellar Objects</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/bruzual-atlas' class="offcanvas__section-link" >Bruzual Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/the-bruzual-charlot-atlas' class="offcanvas__section-link" >The Bruzual-Charlot Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/bruzual-and-charlot-2003' class="offcanvas__section-link" >Bruzual and Charlot 2003</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/bruzual-persson-gunn-stryker-atlas-list' class="offcanvas__section-link" >Bruzual-Persson-Gunn-Stryker Atlas list</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/buser-kurucz-atlas' class="offcanvas__section-link" >Buser-Kurucz Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/calobs' class="offcanvas__section-link" >CALOBS</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/calspec' class="offcanvas__section-link" >CALSPEC</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/castelli-and-kurucz-atlas' class="offcanvas__section-link" >Castelli and Kurucz Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/composite-qso-spectra-for-nir' class="offcanvas__section-link" >Composite QSO Spectra for NIR</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/the-galactic-emission-line-object-atlas' class="offcanvas__section-link" >The Galactic Emission Line Object Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/gunn-stryker-atlas-list' class="offcanvas__section-link" >Gunn-Stryker Atlas list</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/interstellar-extinction-curves' class="offcanvas__section-link" >Interstellar Extinction Curves</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/jacoby-hunter-christian-atlas' class="offcanvas__section-link" >Jacoby-Hunter-Christian Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/the-kinney-calzetti-spetral-atlas' class="offcanvas__section-link" >The Kinney-Calzetti Spectral Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/kinney-models' class="offcanvas__section-link" >Kinney Models</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/kurucz-1993-models' class="offcanvas__section-link" >Kurucz 1993 Models</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/non-stellar-spectra' class="offcanvas__section-link" >Non-Stellar Spectra</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/novae-models' class="offcanvas__section-link" >Novae Models</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/phoenix-models-available-in-synphot' class="offcanvas__section-link" >Phoenix Models available in Synphot</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/planetary-nebula-spectra' class="offcanvas__section-link" >Planetary Nebula Spectra</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/pickles-atlas' class="offcanvas__section-link" >Pickles Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/simple-stellar-population-atlas' class="offcanvas__section-link" >Simple Stellar Population Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/solar-system-objects-spectra' class="offcanvas__section-link" >Solar System Objects Spectra</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/swire-galaxies' class="offcanvas__section-link" >SWIRE Galaxies</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/the-trds-brown-atlas' class="offcanvas__section-link" >The TRDS Brown Atlas</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/trds-brown19-spectra-of-agns' class="offcanvas__section-link" >TRDS Brown19 Spectra of AGNs</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/modewave-data' class="offcanvas__section-link" >Modewave Data</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/documentation' class="offcanvas__section-link" >Documentation</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/documentation' class="offcanvas__section-link" >Documentation</a><button class="offcanvas__section-toggle" id="Documentation_64_control" type="button" aria-label="Documentation submenu" aria-controls="Documentation_64_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use 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class="offcanvas-body"> <section id="top-of-page"> <main id="main-content" class=" " > <h1 id="page-title" class="sr-only home-page-title">Home</h1> <div class="main"> <section id="section-6e0380d2-2013-491d-b5ca-4ba408006773" data-name="section-introduction" class="section-row none" > <h2 id="h2-sr-only-6e0380d2-2013-491d-b5ca-4ba408006773" data-name="h2-sr-only-introduction" class="sr-only" data-include-in-navigation="true"> Introduction</h2> <div class="component-block"> <div class="background-img banner"> <div class="hero-item"> <div class="hero-video" data-module-dynamic="full-screen-video" data-poster="/files/live/sites/www/files/home/_images/hero-items/STSCI-www-2025-02-hero-fallback-1920x1080.jpg" data-video-description="The Space Telescope Science Institute helps humanity explore the universe with advanced space telescopes and ever-growing data archives from its Baltimore, Maryland, headquarters. This video highlights six images from two of its missions, the Hubble and James Webb space telescopes. Each image is momentarily shown before it quickly transforms into slimmed down, cropped versions and moves off screen. The video’s images, in order, are as follows: 1) Webb and Hubble image of two spiral galaxies; NGC 2207 on the right spreads its spiral arms to the edges, and IC 2163 on the left is half the size. Together they take the shape of a colorful beaded mask. 2) Webb's image of Jupiter in enhanced color features the planet’s famous Great Red Spot (pink in this image) and swirling horizontal stripes of green, periwinkle, light pink, and cream. The northern and southern poles glow green with bright red auroras. 3) Hubble image of Galaxy LEDA 1313424, a nearly face-in galaxy nicknamed the Bullseye with several pronounced rings, and a small blue dwarf galaxy with many dots. 4) Webb's image of Galaxy Cluster G165 displays a black background scattered with hundreds of small galaxies of different shapes and colors. Some galaxies appear to be stretched into red arcs or mirror imaged. A cluster of a few white galaxies look like a glowing orb. 5) Hubble's image of the Andromeda galaxy showcases the nearly edge-on spiral galaxy, spread across the width. Its bright yellowish central core is laced with dark, dusty filamentary clouds and bluish outer edges 6) Webbs's image of the Serpens Nebula a young star-forming region filled with wispy orange, red, and blue layers of gas and dust. It features an eye-shaped crevice with a bright star with diffraction spikes at the center, and a bright star that has an hourglass shadow above and below it." data-video-label="Webb and Hubble Space Telescopes Featured Images" data-video-mp4="https://stsci-opo.org/jahia/videos/Hero-STSCI-Feb2025_AD-1920x1080.mp4" > <picture class="stretch-container"><img alt="White text is located in the center of the video and reads “STScI: Space Telescope Science Institute; Expanding the Frontiers of Space Astronomy.” Six colorful images of space appear in thin verticals. From left to right: A colorful beaded mask is two spiral galaxies with pink, white and blue arms. Jupiter in enhanced color with green blue and cream stripes and a pink Great Red Spot. A large face-on galaxy and dwarf galaxy over a landscape of distant galaxies. Groups of white orbs and reddish arc-shapes stand out among a galaxy cluster. Close-up of the yellowish core of a galaxy with dusty filaments and dark bluish edges. Gaseous orange and blue material surround stars with long diffraction spikes." src="/files/live/sites/www/files/home/_images/hero-items/STSCI-www-2025-02-hero-fallback-1920x1080.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/hero-items/STSCI-www-2025-02-hero-fallback-1920x1080.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/hero-items/STSCI-www-2025-02-hero-fallback-1920x1080.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/hero-items/STSCI-www-2025-02-hero-fallback-1920x1080.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/hero-items/STSCI-www-2025-02-hero-fallback-1920x1080.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/hero-items/STSCI-www-2025-02-hero-fallback-1920x1080.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/hero-items/STSCI-www-2025-02-hero-fallback-1920x1080.jpg?t=tn1920 1920w" sizes="100vw" /></picture><noscript><img alt="White text is located in the center of the video and reads “STScI: Space Telescope Science Institute; Expanding the Frontiers of Space Astronomy.” Six colorful images of space appear in thin verticals. From left to right: A colorful beaded mask is two spiral galaxies with pink, white and blue arms. Jupiter in enhanced color with green blue and cream stripes and a pink Great Red Spot. A large face-on galaxy and dwarf galaxy over a landscape of distant galaxies. Groups of white orbs and reddish arc-shapes stand out among a galaxy cluster. Close-up of the yellowish core of a galaxy with dusty filaments and dark bluish edges. Gaseous orange and blue material surround stars with long diffraction spikes." class="noscript-img null" src="/files/live/sites/www/files/home/_images/hero-items/STSCI-www-2025-02-hero-fallback-1920x1080.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/hero-items/STSCI-www-2025-02-hero-fallback-1920x1080.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/hero-items/STSCI-www-2025-02-hero-fallback-1920x1080.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/hero-items/STSCI-www-2025-02-hero-fallback-1920x1080.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/hero-items/STSCI-www-2025-02-hero-fallback-1920x1080.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/hero-items/STSCI-www-2025-02-hero-fallback-1920x1080.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/hero-items/STSCI-www-2025-02-hero-fallback-1920x1080.jpg?t=tn1920 1920w" sizes="100vw" /></noscript></div></div> <div class="hero-flex-container banner-content"> <img alt="STScI Logo" src="/files/live/sites/www/files/home/_images/footer/stsci_pri_combo_mark_white_bkgd.png?t=tn370" srcset="/files/live/sites/www/files/home/_images/footer/stsci_pri_combo_mark_white_bkgd.png?t=tn370 370w, /files/live/sites/www/files/home/_images/footer/stsci_pri_combo_mark_white_bkgd.png?t=tn768 768w, /files/live/sites/www/files/home/_images/footer/stsci_pri_combo_mark_white_bkgd.png?t=tn992 992w" sizes="(max-width: 400px) 100vw, 400px" /><div class="hero-text"> <div class="hero-subheading-text">Expanding the Frontiers of Space Astronomy</div> </div> </div>  </div> </div> <a id="banner-scroll-down" class="scroll-down" aria-label="scroll down to first section" data-module-dynamic="scroll-to" href="#"></a> </section><section id="section-900f1cfc-92d5-47ee-8265-467f01d6eaba" data-name="section-our-mission" class="section-row none" > <h2 id="h2-sr-only-900f1cfc-92d5-47ee-8265-467f01d6eaba" data-name="h2-sr-only-our-mission" class="sr-only" data-include-in-navigation="true"> Our Mission</h2> <div class="component-block flex-container flex-container--collapsed ad-box-container ad-box-container--gradient-overlay text-left" > <ul role="list" class="items-per-row--3"> <li> <div class="card dark-background-" data-module-dynamic="card"> <div class="card__content"> <h3 id="h3-adbox-gradient-overlay-e2ab1cea-6b28-41be-a7fe-bf8bf509d09c"> <a href="/what-we-do" class="card-link arrow-link animate-icon" target="_self"> We Are Multi-Mission</a></h3> <p>We help humanity explore the universe with advanced space telescopes and ever-growing data archives.</p> </div> <div class="card__image-wrapper"> <picture class="stretch-container"><img alt="Collage of artist illustrations of STScI missions" class="text-overlay__img hover-reveal__img lazyload" loading="lazy" src="/files/live/sites/www/files/home/_images/AdBox-Missions-001.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/AdBox-Missions-001.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/AdBox-Missions-001.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/AdBox-Missions-001.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/AdBox-Missions-001.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/AdBox-Missions-001.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/AdBox-Missions-001.jpg?t=tn2400 2400w" sizes="(max-width: 768px) 100vw, (max-width: 992px) 50vw, calc(100vw / 3)" /></picture><noscript><img alt="Collage of artist illustrations of STScI missions" class="noscript-img text-overlay__img " src="/files/live/sites/www/files/home/_images/AdBox-Missions-001.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/AdBox-Missions-001.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/AdBox-Missions-001.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/AdBox-Missions-001.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/AdBox-Missions-001.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/AdBox-Missions-001.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/AdBox-Missions-001.jpg?t=tn2400 2400w" sizes="(max-width: 768px) 100vw, (max-width: 992px) 50vw, calc(100vw / 3)" /></noscript></div> <div class="card__gradient"></div> <div class="card__outline"></div> </div></li> <li> <div class="card dark-background-" data-module-dynamic="card"> <div class="card__content"> <h3 id="h3-adbox-gradient-overlay-186489df-daba-40a1-88d5-8100f3c2d13b"> <a href="/stsci-research" class="card-link arrow-link animate-icon" target="_self"> We Further Scientific Research</a></h3> <p>We envision, define, and operate missions that offer cutting-edge research opportunities for the astronomical community.</p> </div> <div class="card__image-wrapper"> <picture class="stretch-container"><img alt="Helix Nebula (NGC 7293)" class="text-overlay__img hover-reveal__img lazyload" loading="lazy" src="/files/live/sites/www/files/home/_images/AdBox-ScientificResearch-001.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/AdBox-ScientificResearch-001.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/AdBox-ScientificResearch-001.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/AdBox-ScientificResearch-001.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/AdBox-ScientificResearch-001.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/AdBox-ScientificResearch-001.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/AdBox-ScientificResearch-001.jpg?t=tn2400 2400w" sizes="(max-width: 768px) 100vw, (max-width: 992px) 50vw, calc(100vw / 3)" /></picture><noscript><img alt="Helix Nebula (NGC 7293)" class="noscript-img text-overlay__img " src="/files/live/sites/www/files/home/_images/AdBox-ScientificResearch-001.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/AdBox-ScientificResearch-001.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/AdBox-ScientificResearch-001.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/AdBox-ScientificResearch-001.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/AdBox-ScientificResearch-001.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/AdBox-ScientificResearch-001.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/AdBox-ScientificResearch-001.jpg?t=tn2400 2400w" sizes="(max-width: 768px) 100vw, (max-width: 992px) 50vw, calc(100vw / 3)" /></noscript></div> <div class="card__gradient"></div> <div class="card__outline"></div> </div></li> <li> <div class="card dark-background-" data-module-dynamic="card"> <div class="card__content"> <h3 id="h3-adbox-gradient-overlay-d28ba36d-bce2-465b-9206-a04c2864d1ec"> <a href="/communications-and-outreach" class="card-link arrow-link animate-icon" target="_self"> We Inspire Through Outreach</a></h3> <p>We share scientific knowledge of the universe in ways that inspire, excite, challenge, and educate.</p> </div> <div class="card__image-wrapper"> <picture class="stretch-container"><img alt="A group of students looking at the sky through eclipse glasses." class="text-overlay__img hover-reveal__img lazyload" loading="lazy" src="/files/live/sites/www/files/home/_images/adbox-images/Teachable-Moments.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/adbox-images/Teachable-Moments.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/adbox-images/Teachable-Moments.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/adbox-images/Teachable-Moments.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/adbox-images/Teachable-Moments.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/adbox-images/Teachable-Moments.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/adbox-images/Teachable-Moments.jpg?t=tn2400 2400w" sizes="(max-width: 768px) 100vw, (max-width: 992px) 50vw, calc(100vw / 3)" /></picture><noscript><img alt="A group of students looking at the sky through eclipse glasses." class="noscript-img text-overlay__img " src="/files/live/sites/www/files/home/_images/adbox-images/Teachable-Moments.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/adbox-images/Teachable-Moments.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/adbox-images/Teachable-Moments.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/adbox-images/Teachable-Moments.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/adbox-images/Teachable-Moments.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/adbox-images/Teachable-Moments.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/adbox-images/Teachable-Moments.jpg?t=tn2400 2400w" sizes="(max-width: 768px) 100vw, (max-width: 992px) 50vw, calc(100vw / 3)" /></noscript></div> <div class="card__gradient"></div> <div class="card__outline"></div> </div></li> </ul> </div></section><section id="section-e89800d5-f9b0-48c3-abeb-19dff32d972c" data-name="section-recent-news" class="section-row none" > <h2 id="h2-sr-only-fd2d1906-45a3-4771-be41-1226a32d85db" data-name="h2-sr-only-recent-news" class="sr-only" data-include-in-navigation="true"> Recent News</h2> <section id="section-b1605ff4-d50a-4853-bb42-fcb3d45e50d1" data-name="section-institute-announcements" class="section-row none" > <div class="component-block container-fluid"> <div class="row"> <div class="section-header col-xs-12 text-center"> <h2 id="h2-5e0a5a6c-3721-4208-9a8a-28a142d23633" data-name="h2-institute-announcements" class="section-header__title" data-include-in-navigation="false"> Institute Announcements</h2> </div> </div> </div> <div class="component-block container-fluid"> <h3 id=h3-37311385-3431-4d6d-a1c7-fe007a0bd1a2 class="text-center sr-only">Current</h3> <div class="announcements-row"> <ul role="list" aria-describedby="h3-37311385-3431-4d6d-a1c7-fe007a0bd1a2"> <li> <div class="announcement hover-reveal card announcement__wrapper-link" data-module-dynamic="card"> <div class="announcement__right"> <h4 id="h4-announcement-c649fbff-6ec1-4570-8cf7-5401a61c11d5" aria-describedby="card-read-more-c649fbff-6ec1-4570-8cf7-5401a61c11d5"> <a href="/who-we-are/stsci-annual-reports" class="card-link" > 2024 Annual Report</a></h4> <div class="announcement__description"> Last year, Hubble and Webb delivered top-tier science, and preparations for Roman’s launch and operations continued.   <span class="announcement__learn-more arrow-link" id="card-read-more-c649fbff-6ec1-4570-8cf7-5401a61c11d5" aria-hidden="true" data-href="/cms/render/live/en/sites/www/home/who-we-are/stsci-annual-reports.html"> Explore It All!</span> </div> </div> <div class="announcement__left"> <picture class="flex-ratio"><img alt="Graphic in shades of blue with illustrations of a Maryland blue crab and the Baltimore skyline in shades of gray. Text reads: expanding the frontiers of space astronomy, ’24 in review." class="lazyload" loading="lazy" src="/files/live/sites/www/files/home/_images/announcements/AR24-Annoucement.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/announcements/AR24-Annoucement.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/announcements/AR24-Annoucement.jpg?t=tn768 768w" sizes="320px" /></picture><noscript><img alt="Graphic in shades of blue with illustrations of a Maryland blue crab and the Baltimore skyline in shades of gray. Text reads: expanding the frontiers of space astronomy, ’24 in review." class="noscript-img " src="/files/live/sites/www/files/home/_images/announcements/AR24-Annoucement.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/announcements/AR24-Annoucement.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/announcements/AR24-Annoucement.jpg?t=tn768 768w" sizes="320px" /></noscript></div> </div> </li><li> <div class="announcement hover-reveal card announcement__wrapper-link" data-module-dynamic="card"> <div class="announcement__right"> <h4 id="h4-announcement-1a2a1e7f-e868-43c3-9fe0-102de63aaa43" aria-describedby="card-read-more-1a2a1e7f-e868-43c3-9fe0-102de63aaa43"> <a href="/news/newsletters" class="card-link" > STScI Newsletter: Three AAS-Related Articles</a></h4> <div class="announcement__description"> Learn about STScI’s involvement at the 245th AAS Meeting, January 12-16, at National Harbor, MD.   <span class="announcement__learn-more arrow-link" id="card-read-more-1a2a1e7f-e868-43c3-9fe0-102de63aaa43" aria-hidden="true" data-href="/cms/render/live/en/sites/www/home/news/newsletters.html"> Read the Articles</span> </div> </div> <div class="announcement__left"> <picture class="flex-ratio"><img alt="STScI at the 245th AAS meeting" class="lazyload" loading="lazy" src="/files/live/sites/www/files/home/news/newsletters/2025/issue%2001/_images/AAS-Cover.jpg?t=tn370" srcset="/files/live/sites/www/files/home/news/newsletters/2025/issue%2001/_images/AAS-Cover.jpg?t=tn370 370w, /files/live/sites/www/files/home/news/newsletters/2025/issue%2001/_images/AAS-Cover.jpg?t=tn768 768w" sizes="320px" /></picture><noscript><img alt="STScI at the 245th AAS meeting" class="noscript-img " src="/files/live/sites/www/files/home/news/newsletters/2025/issue%2001/_images/AAS-Cover.jpg?t=tn370" srcset="/files/live/sites/www/files/home/news/newsletters/2025/issue%2001/_images/AAS-Cover.jpg?t=tn370 370w, /files/live/sites/www/files/home/news/newsletters/2025/issue%2001/_images/AAS-Cover.jpg?t=tn768 768w" sizes="320px" /></noscript></div> </div> </li><li> <div class="announcement hover-reveal card announcement__wrapper-link" data-module-dynamic="card"> <div class="announcement__right"> <h4 id="h4-announcement-a17ab596-dfbc-49f9-885e-dba2ddaa39f3" aria-describedby="card-read-more-a17ab596-dfbc-49f9-885e-dba2ddaa39f3"> <a href="https://hst-docs.stsci.edu/hsp/hubble-space-telescope-call-for-proposals-for-cycle-33" class="card-link" target="_blank"> HST Cycle 33 Call for Proposals Released</a></h4> <div class="announcement__description"> We are pleased to announce the release of the Cycle 33 Call for Proposals for the Hubble Space Telescope. The proposal deadline is April 10, 2025.   <span class="announcement__learn-more arrow-link" id="card-read-more-a17ab596-dfbc-49f9-885e-dba2ddaa39f3" aria-hidden="true" data-href="https://hst-docs.stsci.edu/hsp/hubble-space-telescope-call-for-proposals-for-cycle-33"> Read the Documentation</span> </div> </div> <div class="announcement__left"> <picture class="flex-ratio"><img alt="Closeup of the Hubble Space Telescope in space" class="lazyload" loading="lazy" src="/files/live/sites/www/files/home/_images/adbox-images/Adbox-HubbleTelescope-001.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/adbox-images/Adbox-HubbleTelescope-001.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/adbox-images/Adbox-HubbleTelescope-001.jpg?t=tn768 768w" sizes="320px" /></picture><noscript><img alt="Closeup of the Hubble Space Telescope in space" class="noscript-img " src="/files/live/sites/www/files/home/_images/adbox-images/Adbox-HubbleTelescope-001.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/adbox-images/Adbox-HubbleTelescope-001.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/adbox-images/Adbox-HubbleTelescope-001.jpg?t=tn768 768w" sizes="320px" /></noscript></div> </div> </li><li> <div class="announcement hover-reveal card announcement__wrapper-link" data-module-dynamic="card"> <div class="announcement__right"> <h4 id="h4-announcement-99b1f131-18e8-45ee-8c1a-9d39a650a7da" aria-describedby="card-read-more-99b1f131-18e8-45ee-8c1a-9d39a650a7da"> <a href="https://spacetelescopelive.org/" class="card-link" target="_blank"> What Are Hubble and Webb Looking at Now?</a></h4> <div class="announcement__description"> Check out the revamped Space Telescope Live to find out what Hubble and Webb are currently observing.   <span class="announcement__learn-more arrow-link" id="card-read-more-99b1f131-18e8-45ee-8c1a-9d39a650a7da" aria-hidden="true" data-href="https://spacetelescopelive.org/"> Start Exploring</span> </div> </div> <div class="announcement__left"> <picture class="flex-ratio"><img alt="Space Telescope Live logo in white on a purple to black background with a simple illustration of space, including stars, a planet with rings, and hints of dust clouds and galaxy arms. The logo consists of a a target sight inside a square on the left, and the words "Space Telescope Live" on the right. Below the logo are the words "Interactive Explorer."" class="lazyload" loading="lazy" src="/files/live/sites/www/files/home/_images/announcements/STL-announcement-1200x600.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/announcements/STL-announcement-1200x600.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/announcements/STL-announcement-1200x600.jpg?t=tn768 768w" sizes="320px" /></picture><noscript><img alt="Space Telescope Live logo in white on a purple to black background with a simple illustration of space, including stars, a planet with rings, and hints of dust clouds and galaxy arms. The logo consists of a a target sight inside a square on the left, and the words "Space Telescope Live" on the right. Below the logo are the words "Interactive Explorer."" class="noscript-img " src="/files/live/sites/www/files/home/_images/announcements/STL-announcement-1200x600.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/announcements/STL-announcement-1200x600.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/announcements/STL-announcement-1200x600.jpg?t=tn768 768w" sizes="320px" /></noscript></div> </div> </li></ul> </div> </div></section><section id="section-22c527ea-568c-4cc9-9166-b7d98b3b331f" data-name="section-press-releases" class="section-row dark-background-stsci-dark-blue" > <div class="component-block container-fluid"> <div class="row"> <div class="section-header col-xs-12 text-center"> <h2 id="h2-de11c27a-e5de-41f3-9c33-191bdfe14f2c" data-name="h2-press-releases" class="section-header__title" data-include-in-navigation="true"> Press Releases</h2> </div> </div> </div> <div class="component-block container-fluid "> <ul role="list" class="content-block-wrapper justify-content-center "> <li class="content-prev-wrapper text-center latest-news"> <div class="content-prev flex-col content-prev--news-promo card flex-col" data-module-dynamic="card"> <h3 id="h3-news-item-f8bc777b-a1d4-46ab-95a0-271c5bb1583c" class="content-prev__head"> <a href="/contents/news-releases/2025/news-2025-114" class="card-link" > NASA's Webb Images Young, Giant Exoplanets, Detects Carbon Dioxide</a></h3> <div class="preheader preheader--news-promo-header"> <div class="preheader__item">March 17, 2025</div> </div> <div class="content-prev__image"> <img alt="This image shows the planetary system HR 8799. The background is black. At the center there is a symbol representing a star labeled HR 8799. The star’s light is blocked. There are four exoplanets, which look like fuzzy dots, pictured surrounding the star. Furthest from the star is a fuzzy, faint blue dot, labeled b, at the 10 o’clock position. At the 1 o’clock position, second furthest from the star is a blueish-white fuzzy dot labeled c. Just below that is an orange dot labeled e. At the 4 o’clock position, still near the star, is another fuzzy white dot labeled d." class="lazyload" loading="lazy" src="//stsci-opo.org/STScI-01JNH68NQSKK3352G6EKG4MPYM.png" /></div> <span id="card-read-more-f8bc777b-a1d4-46ab-95a0-271c5bb1583c" class="btn" aria-hidden="true">Read More</span> </div></li> <li class="content-prev-wrapper text-center latest-news"> <div class="content-prev flex-col content-prev--news-promo card flex-col" data-module-dynamic="card"> <h3 id="h3-news-item-afa62947-8d58-4083-905d-1a5dd2410774" class="content-prev__head"> <a href="/contents/news-releases/2025/news-2025-105" class="card-link" > NASA's Webb Peers Deeper into Mysterious Flame Nebula</a></h3> <div class="preheader preheader--news-promo-header"> <div class="preheader__item">March 10, 2025</div> </div> <div class="content-prev__image"> <img alt="A group of two near-infrared images showing a dusty nebula. The left two-thirds of the collage is taken up by a Hubble image of the nebula. The remaining third is taken up by a Webb image. The Hubble image has a pillar of dense brown dust running from the bottom of the image towards the top left. Wispy plumes appear to fly off from the pillar toward the sides amid blue clouds of the same material, which are whiter near the pillar. There are many white stars spread throughout. One square, tilted about 30 degrees, outlines an area of the pillar. The square has the letter “A” to its top right. That square corresponds to the Webb image shown to the right of the group, also labeled “A” at its top right, which is a magnified view of that area of the pillar. The Webb image has less dark brown dust, with some of it giving way to wisps of red and shows more stars, which are a mixture of red, blue, and white." class="lazyload" loading="lazy" src="//stsci-opo.org/STScI-01JKRRQBT33DDPKSEN303A8T0Y.png" /></div> <span id="card-read-more-afa62947-8d58-4083-905d-1a5dd2410774" class="btn" aria-hidden="true">Read More</span> </div></li> <li class="content-prev-wrapper text-center latest-news"> <div class="content-prev flex-col content-prev--news-promo card flex-col" data-module-dynamic="card"> <h3 id="h3-news-item-92259753-a306-4d72-a5b4-45ad017e6b74" class="content-prev__head"> <a href="/contents/news-releases/2025/news-2025-111" class="card-link" > NASA Webb Wows With Incredible Detail in Actively Forming Star System</a></h3> <div class="preheader preheader--news-promo-header"> <div class="preheader__item">March 07, 2025</div> </div> <div class="content-prev__image"> <img alt="At the center is a thin horizontal cloud known as Lynds 483 that is shaped like an hourglass with irregular edges. The left lobe shows a more prominent orange U-shape. Some brighter pink material extends to the left edges. In the right lobe, less orange is visible. More opaque light purple is in the top third, rippling out into semi-transparent blues and pinks. V-shapes to the top and bottom of the center are darkest, and the background stars in these areas appear orange. The black background is speckled with tiny white stars and faint orange galaxies." class="lazyload" loading="lazy" src="//stsci-opo.org/STScI-01JM03AA7MNW8WWXBDPVXAVACM.png" /></div> <span id="card-read-more-92259753-a306-4d72-a5b4-45ad017e6b74" class="btn" aria-hidden="true">Read More</span> </div></li> </ul> </div></section></section><section id="section-85bbe2e7-de5d-4534-a1a5-f34c69ea7134" data-name="section-events" class="section-row none" > <div class="component-block container-fluid"> <div class="row"> <div class="section-header col-xs-12 text-center"> <h2 id="h2-6bd7bfd2-a2c7-43c1-8005-cdd4891941c6" data-name="h2-events" class="section-header__title" data-include-in-navigation="true"> Events</h2> </div> </div> </div> <div class="component-block container-fluid"> <ul role="list" class="row-flex-sm content-prev-slider justify-content-center"> <li class="content-prev-wrapper text-center"> <div class="content-prev flex-col content-prev--border event-preview card" data-module-dynamic="card"> <h3 id="h3-event-preview-dafd7519-bc58-4efa-ac78-9f6eab4ba04b" class="content-prev__head" aria-describedby="card-read-more-dafd7519-bc58-4efa-ac78-9f6eab4ba04b"> <a href="/contents/events/stsci/2025/march/galaxy-clusters-as-dark-matter-laboratories" class="card-link" > Galaxy Clusters As Dark Matter Laboratories</a></h3> <div class="text-overlay"> <picture ><img alt="" class="lazyload" loading="lazy" src="/modules/stsci-www-assets/assets/img/www/event-1.jpg" /></picture><noscript><img alt="" class="noscript-img " src="/modules/stsci-www-assets/assets/img/www/event-1.jpg" /></noscript><div class="text-overlay__head display-date"> <div class="display-date__content-wrapper"> <div class="display-date__content"> <span class="display-date__day"><span>26</span></span> <span class="display-date__break"> <span class="display-date__month"> Mar</span> <span class="display-date__year"> 2025</span> </span> </div> </div></div> </div> <p class="content-prev__sum">The structure of dark halos carries signatures of their mass, dynamical state, and the nature of dark matter itself. Some of the most constraining signals can be found in the outskirts...</p> <div class="content-prev__footer"> <span id="card-read-more-dafd7519-bc58-4efa-ac78-9f6eab4ba04b" class="btn" aria-hidden="true"> Read More </span> </div> </div></li> <li class="content-prev-wrapper text-center"> <div class="content-prev flex-col content-prev--border event-preview card" data-module-dynamic="card"> <h3 id="h3-event-preview-ded36d81-01bb-47f5-906e-c05b0827245f" class="content-prev__head" aria-describedby="card-read-more-ded36d81-01bb-47f5-906e-c05b0827245f"> <a href="/contents/events/jwst/2025/march/webb-office-hours-1" class="card-link" > Webb Office Hours</a></h3> <div class="text-overlay"> <picture ><img alt="Promotional image for Webb Office Hours" class="lazyload" loading="lazy" src="/modules/stsci-www-assets/assets/img/www/event-2.jpg" /></picture><noscript><img alt="Promotional image for Webb Office Hours" class="noscript-img " src="/modules/stsci-www-assets/assets/img/www/event-2.jpg" /></noscript><div class="text-overlay__head display-date"> <div class="display-date__content-wrapper"> <div class="display-date__content"> <span class="display-date__day"><span>27</span></span> <span class="display-date__break"> <span class="display-date__month"> Mar</span> <span class="display-date__year"> 2025</span> </span> </div> </div></div> </div> <p class="content-prev__sum">The JWST User Community is invited to call into Webb Office Hours to ask questions and directly interact with a team of STScI JWST experts via WebEx. We welcome questions about the...</p> <div class="content-prev__footer"> <span id="card-read-more-ded36d81-01bb-47f5-906e-c05b0827245f" class="btn" aria-hidden="true"> Read More </span> </div> </div></li> <li class="content-prev-wrapper text-center"> <div class="content-prev flex-col content-prev--border event-preview card" data-module-dynamic="card"> <h3 id="h3-event-preview-ede21595-9f93-4a1d-bf9b-13569fef48eb" class="content-prev__head" aria-describedby="card-read-more-ede21595-9f93-4a1d-bf9b-13569fef48eb"> <a href="/contents/events/stsci/2025/april/how-to-reionize-the-universe-lessons-from-low-redshift" class="card-link" > How to Reionize the Universe: Lessons from Low Redshift</a></h3> <div class="text-overlay"> <picture ><img alt="" class="lazyload" loading="lazy" src="/modules/stsci-www-assets/assets/img/www/event-3.jpg" /></picture><noscript><img alt="" class="noscript-img " src="/modules/stsci-www-assets/assets/img/www/event-3.jpg" /></noscript><div class="text-overlay__head display-date"> <div class="display-date__content-wrapper"> <div class="display-date__content"> <span class="display-date__day"><span>2</span></span> <span class="display-date__break"> <span class="display-date__month"> Apr</span> <span class="display-date__year"> 2025</span> </span> </div> </div></div> </div> <p class="content-prev__sum">The reionization of the intergalactic medium (IGM) at z > 6 is one of the major transformations in the universe’s history, but we do not yet know which galaxies were responsible...</p> <div class="content-prev__footer"> <span id="card-read-more-ede21595-9f93-4a1d-bf9b-13569fef48eb" class="btn" aria-hidden="true"> Read More </span> </div> </div></li> <li class="content-prev-wrapper text-center"> <div class="content-prev flex-col content-prev--border event-preview card" data-module-dynamic="card"> <h3 id="h3-event-preview-c44d3c6d-1d66-41fa-b617-117f013c042d" class="content-prev__head" aria-describedby="card-read-more-c44d3c6d-1d66-41fa-b617-117f013c042d"> <a href="/contents/events/jwst/2025/april/jwebbinar-40-nircam-and-miri-coronagraphy-an-update-3-years-into-operations" class="card-link" > JWebbinar 40 - NIRCam and MIRI Coronagraphy: An Update 3 Years into Operations</a></h3> <div class="text-overlay"> <picture ><img alt="" class="lazyload" loading="lazy" src="/modules/stsci-www-assets/assets/img/www/event-4.jpg" /></picture><noscript><img alt="" class="noscript-img " src="/modules/stsci-www-assets/assets/img/www/event-4.jpg" /></noscript><div class="text-overlay__head display-date"> <div class="display-date__content-wrapper"> <div class="display-date__content"> <span class="display-date__day"><span>3</span></span> <span class="display-date__break"> <span class="display-date__month"> Apr</span> <span class="display-date__year"> 2025</span> </span> </div> </div></div> </div> <p class="content-prev__sum">Nearly 3 years into operations, we will briefly present an update on the performance and capabilities of NIRCam and MIRI coronagraphs during this JWebbinar. We will review recommended...</p> <div class="content-prev__footer"> <span id="card-read-more-c44d3c6d-1d66-41fa-b617-117f013c042d" class="btn" aria-hidden="true"> Read More </span> </div> </div></li> <li class="content-prev-wrapper text-center"> <div class="content-prev flex-col content-prev--border event-preview card" data-module-dynamic="card"> <h3 id="h3-event-preview-a48e6555-9672-44eb-9106-8e229285f2ad" class="content-prev__head" aria-describedby="card-read-more-a48e6555-9672-44eb-9106-8e229285f2ad"> <a href="/contents/events/ipl/2025/animal-mineral-microbe-how-the-interplay-between-abiotic-and-biotic-processes-shapes-deep-sea-chemoa" class="card-link" > Animal, Mineral, Microbe: How the Interplay Between Abiotic and Biotic Processes Shapes Deep-Sea Chemoautotrophic Symbioses</a></h3> <div class="text-overlay"> <picture ><img alt="" class="lazyload" loading="lazy" src="/modules/stsci-www-assets/assets/img/www/event-5.jpg" /></picture><noscript><img alt="" class="noscript-img " src="/modules/stsci-www-assets/assets/img/www/event-5.jpg" /></noscript><div class="text-overlay__head display-date"> <div class="display-date__content-wrapper"> <div class="display-date__content"> <span class="display-date__day"><span>4</span></span> <span class="display-date__break"> <span class="display-date__month"> Apr</span> <span class="display-date__year"> 2025</span> </span> </div> </div></div> </div> <p class="content-prev__sum">Living organisms evolve in response to one another, but also to the physical and chemical conditions in their habitat. Living things, via their activity, also shape the abiotic world....</p> <div class="content-prev__footer"> <span id="card-read-more-a48e6555-9672-44eb-9106-8e229285f2ad" class="btn" aria-hidden="true"> Read More </span> </div> </div></li> <li class="content-prev-wrapper text-center"> <div class="content-prev flex-col content-prev--border event-preview card" data-module-dynamic="card"> <h3 id="h3-event-preview-b1cf086e-0d98-46ec-9275-733cd0a0ed9a" class="content-prev__head" aria-describedby="card-read-more-b1cf086e-0d98-46ec-9275-733cd0a0ed9a"> <a href="/contents/events/stsci/2025/april/the-discovery-of-the-multiply-imaged-standard-candle-sn-h0pe-as-a-part-of-the-jwst-gto-pearls-progra" class="card-link" > The Discovery of the Multiply-imaged Standard Candle "SN H0pe" as a part of the JWST GTO PEARLS Program</a></h3> <div class="text-overlay"> <picture ><img alt="" class="lazyload" loading="lazy" src="/modules/stsci-www-assets/assets/img/www/event-6.jpg" /></picture><noscript><img alt="" class="noscript-img " src="/modules/stsci-www-assets/assets/img/www/event-6.jpg" /></noscript><div class="text-overlay__head display-date"> <div class="display-date__content-wrapper"> <div class="display-date__content"> <span class="display-date__day"><span>9</span></span> <span class="display-date__break"> <span class="display-date__month"> Apr</span> <span class="display-date__year"> 2025</span> </span> </div> </div></div> </div> <p class="content-prev__sum">Abstract is forthcoming. Speaker: Brenda Frye (The University of Arizona) </p> <div class="content-prev__footer"> <span id="card-read-more-b1cf086e-0d98-46ec-9275-733cd0a0ed9a" class="btn" aria-hidden="true"> Read More </span> </div> </div></li> </ul> </div></section><section id="section-eefb8e47-f623-423a-abbb-a4c1cfe77f18" data-name="section-about-the-institute" class="section-row light-background-stsci-light-grey" > <h2 id="h2-sr-only-67019cfe-63d5-4c73-a697-f85c4e5369d6" data-name="h2-sr-only-about-the-institute" class="sr-only" data-include-in-navigation="true"> About the Institute</h2> <div class="component-block container-fluid "> <ul role="list" class="content-block-wrapper justify-content-center non-hover-adbox-container "> <li class="content-prev-wrapper text-center"> <div class="content-prev flex-col card" data-module-dynamic="card"> <h3 id="h3-adbox-text-under-image-f8b5dcf3-cc8b-427f-934e-e2b7b70f2b2e" class="content-prev__head large-preview"> <a href="/who-we-are/our-history" class="has-icon no-file-icon card-link" target="_self"> Our History</a></h3> <div class="content-prev__image"> <picture class="flex-ratio"><img alt="Hubble Space Telescope (HST) during rendezvous with STS-125 Shuttle Atlantis" class="lazyload" loading="lazy" src="/files/live/sites/www/files/home/_images/AdBox-OurHistory-001.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/AdBox-OurHistory-001.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/AdBox-OurHistory-001.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/AdBox-OurHistory-001.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/AdBox-OurHistory-001.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/AdBox-OurHistory-001.jpg?t=tn1600 1600w" sizes="(max-width: 768px) 100vw, (max-width: 992px) 50vw, 360px" /></picture><noscript><img alt="Hubble Space Telescope (HST) during rendezvous with STS-125 Shuttle Atlantis" class="noscript-img " src="/files/live/sites/www/files/home/_images/AdBox-OurHistory-001.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/AdBox-OurHistory-001.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/AdBox-OurHistory-001.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/AdBox-OurHistory-001.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/AdBox-OurHistory-001.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/AdBox-OurHistory-001.jpg?t=tn1600 1600w" sizes="(max-width: 768px) 100vw, (max-width: 992px) 50vw, 360px" /></noscript></div> <div class="content-prev__footer"> <span class="btn">Learn More</span> </div> </div></li> <li class="content-prev-wrapper text-center"> <div class="content-prev flex-col card" data-module-dynamic="card"> <h3 id="h3-adbox-text-under-image-869a7170-0af0-4c98-b850-7584ec3ea495" class="content-prev__head large-preview"> <a href="/contact" class="has-icon no-file-icon card-link" target="_self"> Our Locations</a></h3> <div 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srcset="/files/live/sites/www/files/home/_images/AdBox-OurLocations-001.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/AdBox-OurLocations-001.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/AdBox-OurLocations-001.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/AdBox-OurLocations-001.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/AdBox-OurLocations-001.jpg?t=tn1600 1600w" sizes="(max-width: 768px) 100vw, (max-width: 992px) 50vw, 360px" /></noscript></div> <div class="content-prev__footer"> <span class="btn">Learn More</span> </div> </div></li> <li class="content-prev-wrapper text-center"> <div class="content-prev flex-col card" data-module-dynamic="card"> <h3 id="h3-adbox-text-under-image-7de929d4-f6e3-4fd5-8a92-ccb0789aed9f" class="content-prev__head large-preview"> <a href="/opportunities" class="has-icon no-file-icon card-link" target="_self"> Career Opportunities</a></h3> <div class="content-prev__image"> <picture class="flex-ratio"><img alt="Several employees working at the JWST Mission Operating Center" class="lazyload" loading="lazy" src="/files/live/sites/www/files/home/_images/AdBox-CareerOpportunities-001.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/AdBox-CareerOpportunities-001.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/AdBox-CareerOpportunities-001.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/AdBox-CareerOpportunities-001.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/AdBox-CareerOpportunities-001.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/AdBox-CareerOpportunities-001.jpg?t=tn1600 1600w" sizes="(max-width: 768px) 100vw, (max-width: 992px) 50vw, 360px" /></picture><noscript><img alt="Several employees working at the JWST Mission Operating Center" class="noscript-img " src="/files/live/sites/www/files/home/_images/AdBox-CareerOpportunities-001.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/AdBox-CareerOpportunities-001.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/AdBox-CareerOpportunities-001.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/AdBox-CareerOpportunities-001.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/AdBox-CareerOpportunities-001.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/AdBox-CareerOpportunities-001.jpg?t=tn1600 1600w" sizes="(max-width: 768px) 100vw, (max-width: 992px) 50vw, 360px" /></noscript></div> <div class="content-prev__footer"> <span class="btn">Learn More</span> </div> </div></li> </ul> </div></section><div role="region" aria-describedby="sliderH3-89de8c39-5e6e-4990-b572-3701f0fd6434" class="slider-container component-block light-background-" data-hide-title="true" id="89de8c39-5e6e-4990-b572-3701f0fd6434" style="position: relative"> <h3 id="sliderH3-89de8c39-5e6e-4990-b572-3701f0fd6434" class="sr-only text-center">STScI's Astronomical Imagery Slideshow</h3> <div class="controls-container" role="group" aria-label="Slide controls"> <div class="controls-container__inner"> <div class="controls-container__wrapper"> <button type="button" data-role="none" class="slick-prev slick-arrow slider-arrow--circle"> <span class="svg-sprite -circle-arrow"> <svg role="img" aria-hidden="true" focusable="false"> <use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#circle-arrow"/> </svg> </span> previous slide </button> <span class="slide-position"> <span class="sr-only">Now showing slide</span> <span class="current-position">1</span> <span class="sr-only">of</span> <span aria-hidden="true">/</span> <span class="total-slides">10</span> </span> <button type="button" data-role="none" class="slick-next slick-arrow slider-arrow--circle"> <span class="svg-sprite -circle-arrow"> <svg role="img" aria-hidden="true" focusable="false"> <use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#circle-arrow"/> </svg> </span> next slide </button> </div> </div> </div> <div class="clearfix"></div> <div class="captioned-slider captioned-slider__full-width"> <div data-module-dynamic="slider" data-slick='{ "breakpoint" : 768, "dots": false, "lazyLoad": "anticipated", "fade": true, "slidesToShow": 1, "slidesToScroll": 1, "appendDots": "#89de8c39-5e6e-4990-b572-3701f0fd6434 .controls-container__inner", "prevArrow": "#89de8c39-5e6e-4990-b572-3701f0fd6434 .controls-container .slick-prev", "nextArrow": "#89de8c39-5e6e-4990-b572-3701f0fd6434 .controls-container .slick-next"}'> <div> <figure> <h4 class="captioned-slider__caption-header sr-only">Spiral Galaxy NGC 1300</h4> <picture ><img alt="Spiral Galaxy NGC 1300" class="lazyload slick-loading" loading="lazy" src="/files/live/sites/www/files/home/_images/gallery-items/spiral-galaxy-ngc-1300.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/gallery-items/spiral-galaxy-ngc-1300.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/gallery-items/spiral-galaxy-ngc-1300.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/gallery-items/spiral-galaxy-ngc-1300.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/gallery-items/spiral-galaxy-ngc-1300.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/gallery-items/spiral-galaxy-ngc-1300.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/gallery-items/spiral-galaxy-ngc-1300.jpg?t=tn2400 2400w" sizes="100vw" /></picture><noscript><img alt="Spiral Galaxy NGC 1300" class="noscript-img slick-loading" src="/files/live/sites/www/files/home/_images/gallery-items/spiral-galaxy-ngc-1300.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/gallery-items/spiral-galaxy-ngc-1300.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/gallery-items/spiral-galaxy-ngc-1300.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/gallery-items/spiral-galaxy-ngc-1300.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/gallery-items/spiral-galaxy-ngc-1300.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/gallery-items/spiral-galaxy-ngc-1300.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/gallery-items/spiral-galaxy-ngc-1300.jpg?t=tn2400 2400w" sizes="100vw" /></noscript></figure> </div><div> <figure> <h4 class="captioned-slider__caption-header sr-only">NGC 3627</h4> <picture ><img alt="NGC 3627" class="lazyload slick-loading" loading="lazy" src="/files/live/sites/www/files/home/_images/gallery-items/ngc-3627.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/gallery-items/ngc-3627.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/gallery-items/ngc-3627.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/gallery-items/ngc-3627.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/gallery-items/ngc-3627.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/gallery-items/ngc-3627.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/gallery-items/ngc-3627.jpg?t=tn2400 2400w" sizes="100vw" /></picture><noscript><img alt="NGC 3627" class="noscript-img slick-loading" src="/files/live/sites/www/files/home/_images/gallery-items/ngc-3627.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/gallery-items/ngc-3627.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/gallery-items/ngc-3627.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/gallery-items/ngc-3627.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/gallery-items/ngc-3627.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/gallery-items/ngc-3627.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/gallery-items/ngc-3627.jpg?t=tn2400 2400w" sizes="100vw" /></noscript></figure> </div><div> <figure> <h4 class="captioned-slider__caption-header sr-only">Bug Nebula</h4> <picture ><img alt="A dying star shrouded by a blanket of hailstones forms the Bug Nebula (NGC 6302)." class="lazyload slick-loading" loading="lazy" src="/files/live/sites/www/files/home/_images/gallery-items/bug-nebula.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/gallery-items/bug-nebula.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/gallery-items/bug-nebula.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/gallery-items/bug-nebula.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/gallery-items/bug-nebula.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/gallery-items/bug-nebula.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/gallery-items/bug-nebula.jpg?t=tn2400 2400w" sizes="100vw" /></picture><noscript><img alt="A dying star shrouded by a blanket of hailstones forms the Bug Nebula (NGC 6302)." class="noscript-img slick-loading" src="/files/live/sites/www/files/home/_images/gallery-items/bug-nebula.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/gallery-items/bug-nebula.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/gallery-items/bug-nebula.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/gallery-items/bug-nebula.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/gallery-items/bug-nebula.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/gallery-items/bug-nebula.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/gallery-items/bug-nebula.jpg?t=tn2400 2400w" sizes="100vw" /></noscript></figure> </div><div> <figure> <h4 class="captioned-slider__caption-header sr-only">Small Magellanic Cloud</h4> <picture ><img alt="Small Magellanic Cloud" class="lazyload slick-loading" loading="lazy" src="/files/live/sites/www/files/home/_images/gallery-items/small-magellanic-cloud.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/gallery-items/small-magellanic-cloud.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/gallery-items/small-magellanic-cloud.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/gallery-items/small-magellanic-cloud.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/gallery-items/small-magellanic-cloud.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/gallery-items/small-magellanic-cloud.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/gallery-items/small-magellanic-cloud.jpg?t=tn2400 2400w" sizes="100vw" /></picture><noscript><img alt="Small Magellanic Cloud" class="noscript-img slick-loading" src="/files/live/sites/www/files/home/_images/gallery-items/small-magellanic-cloud.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/gallery-items/small-magellanic-cloud.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/gallery-items/small-magellanic-cloud.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/gallery-items/small-magellanic-cloud.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/gallery-items/small-magellanic-cloud.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/gallery-items/small-magellanic-cloud.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/gallery-items/small-magellanic-cloud.jpg?t=tn2400 2400w" sizes="100vw" /></noscript></figure> </div><div> <figure> <h4 class="captioned-slider__caption-header sr-only">Stephan's Quintet</h4> <picture ><img alt="Stephan's Quintet" class="lazyload slick-loading" loading="lazy" src="/files/live/sites/www/files/home/_images/gallery-items/stephans-quintet.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/gallery-items/stephans-quintet.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/gallery-items/stephans-quintet.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/gallery-items/stephans-quintet.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/gallery-items/stephans-quintet.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/gallery-items/stephans-quintet.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/gallery-items/stephans-quintet.jpg?t=tn2400 2400w" sizes="100vw" /></picture><noscript><img alt="Stephan's Quintet" class="noscript-img slick-loading" src="/files/live/sites/www/files/home/_images/gallery-items/stephans-quintet.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/gallery-items/stephans-quintet.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/gallery-items/stephans-quintet.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/gallery-items/stephans-quintet.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/gallery-items/stephans-quintet.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/gallery-items/stephans-quintet.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/gallery-items/stephans-quintet.jpg?t=tn2400 2400w" sizes="100vw" /></noscript></figure> </div><div> <figure> <h4 class="captioned-slider__caption-header sr-only">Faint glow within galaxy clusters</h4> <picture ><img alt="Faint glow within galaxy clusters" class="lazyload slick-loading" loading="lazy" src="/files/live/sites/www/files/home/hst/instrumentation/wfc3/_images/STSCI-H-p1856d-f-3600x3600.jpg?t=tn370" srcset="/files/live/sites/www/files/home/hst/instrumentation/wfc3/_images/STSCI-H-p1856d-f-3600x3600.jpg?t=tn370 370w, /files/live/sites/www/files/home/hst/instrumentation/wfc3/_images/STSCI-H-p1856d-f-3600x3600.jpg?t=tn768 768w, /files/live/sites/www/files/home/hst/instrumentation/wfc3/_images/STSCI-H-p1856d-f-3600x3600.jpg?t=tn992 992w, /files/live/sites/www/files/home/hst/instrumentation/wfc3/_images/STSCI-H-p1856d-f-3600x3600.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/hst/instrumentation/wfc3/_images/STSCI-H-p1856d-f-3600x3600.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/hst/instrumentation/wfc3/_images/STSCI-H-p1856d-f-3600x3600.jpg?t=tn2400 2400w" sizes="100vw" /></picture><noscript><img alt="Faint glow within galaxy clusters" class="noscript-img slick-loading" src="/files/live/sites/www/files/home/hst/instrumentation/wfc3/_images/STSCI-H-p1856d-f-3600x3600.jpg?t=tn370" srcset="/files/live/sites/www/files/home/hst/instrumentation/wfc3/_images/STSCI-H-p1856d-f-3600x3600.jpg?t=tn370 370w, /files/live/sites/www/files/home/hst/instrumentation/wfc3/_images/STSCI-H-p1856d-f-3600x3600.jpg?t=tn768 768w, /files/live/sites/www/files/home/hst/instrumentation/wfc3/_images/STSCI-H-p1856d-f-3600x3600.jpg?t=tn992 992w, /files/live/sites/www/files/home/hst/instrumentation/wfc3/_images/STSCI-H-p1856d-f-3600x3600.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/hst/instrumentation/wfc3/_images/STSCI-H-p1856d-f-3600x3600.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/hst/instrumentation/wfc3/_images/STSCI-H-p1856d-f-3600x3600.jpg?t=tn2400 2400w" sizes="100vw" /></noscript></figure> </div><div> <figure> <h4 class="captioned-slider__caption-header sr-only">Supernova Remnant 0509-67.5</h4> <picture ><img alt="Supernova Remnant 0509-67.5" class="lazyload slick-loading" loading="lazy" src="/files/live/sites/www/files/home/_images/gallery-items/supernova-remnant-0509-675.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/gallery-items/supernova-remnant-0509-675.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/gallery-items/supernova-remnant-0509-675.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/gallery-items/supernova-remnant-0509-675.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/gallery-items/supernova-remnant-0509-675.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/gallery-items/supernova-remnant-0509-675.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/gallery-items/supernova-remnant-0509-675.jpg?t=tn2400 2400w" sizes="100vw" /></picture><noscript><img alt="Supernova Remnant 0509-67.5" class="noscript-img slick-loading" src="/files/live/sites/www/files/home/_images/gallery-items/supernova-remnant-0509-675.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/gallery-items/supernova-remnant-0509-675.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/gallery-items/supernova-remnant-0509-675.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/gallery-items/supernova-remnant-0509-675.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/gallery-items/supernova-remnant-0509-675.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/gallery-items/supernova-remnant-0509-675.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/gallery-items/supernova-remnant-0509-675.jpg?t=tn2400 2400w" sizes="100vw" /></noscript></figure> </div><div> <figure> <h4 class="captioned-slider__caption-header sr-only">Horsehead Nebula (Infrared)</h4> <picture ><img alt="Horsehead Nebula (Infrared)" class="lazyload slick-loading" loading="lazy" src="/files/live/sites/www/files/home/_images/gallery-items/horsehead-nebula-infrared.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/gallery-items/horsehead-nebula-infrared.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/gallery-items/horsehead-nebula-infrared.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/gallery-items/horsehead-nebula-infrared.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/gallery-items/horsehead-nebula-infrared.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/gallery-items/horsehead-nebula-infrared.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/gallery-items/horsehead-nebula-infrared.jpg?t=tn2400 2400w" sizes="100vw" /></picture><noscript><img alt="Horsehead Nebula (Infrared)" class="noscript-img slick-loading" src="/files/live/sites/www/files/home/_images/gallery-items/horsehead-nebula-infrared.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/gallery-items/horsehead-nebula-infrared.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/gallery-items/horsehead-nebula-infrared.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/gallery-items/horsehead-nebula-infrared.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/gallery-items/horsehead-nebula-infrared.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/gallery-items/horsehead-nebula-infrared.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/gallery-items/horsehead-nebula-infrared.jpg?t=tn2400 2400w" sizes="100vw" /></noscript></figure> </div><div> <figure> <h4 class="captioned-slider__caption-header sr-only">Heart of the Tarantula Nebula</h4> <picture ><img alt="Heart of the Tarantula Nebula" class="lazyload slick-loading" loading="lazy" src="/files/live/sites/www/files/home/_images/gallery-items/heart-of-the-tarantula-nebula.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/gallery-items/heart-of-the-tarantula-nebula.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/gallery-items/heart-of-the-tarantula-nebula.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/gallery-items/heart-of-the-tarantula-nebula.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/gallery-items/heart-of-the-tarantula-nebula.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/gallery-items/heart-of-the-tarantula-nebula.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/gallery-items/heart-of-the-tarantula-nebula.jpg?t=tn2400 2400w" sizes="100vw" /></picture><noscript><img alt="Heart of the Tarantula Nebula" class="noscript-img slick-loading" src="/files/live/sites/www/files/home/_images/gallery-items/heart-of-the-tarantula-nebula.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/gallery-items/heart-of-the-tarantula-nebula.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/gallery-items/heart-of-the-tarantula-nebula.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/gallery-items/heart-of-the-tarantula-nebula.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/gallery-items/heart-of-the-tarantula-nebula.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/gallery-items/heart-of-the-tarantula-nebula.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/gallery-items/heart-of-the-tarantula-nebula.jpg?t=tn2400 2400w" sizes="100vw" /></noscript></figure> </div><div> <figure> <h4 class="captioned-slider__caption-header sr-only">Westerlund 2</h4> <picture ><img alt="Westerlund 2" class="lazyload slick-loading" loading="lazy" src="/files/live/sites/www/files/home/_images/gallery-items/westerlund-2.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/gallery-items/westerlund-2.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/gallery-items/westerlund-2.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/gallery-items/westerlund-2.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/gallery-items/westerlund-2.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/gallery-items/westerlund-2.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/gallery-items/westerlund-2.jpg?t=tn2400 2400w" sizes="100vw" /></picture><noscript><img alt="Westerlund 2" class="noscript-img slick-loading" src="/files/live/sites/www/files/home/_images/gallery-items/westerlund-2.jpg?t=tn370" srcset="/files/live/sites/www/files/home/_images/gallery-items/westerlund-2.jpg?t=tn370 370w, /files/live/sites/www/files/home/_images/gallery-items/westerlund-2.jpg?t=tn768 768w, /files/live/sites/www/files/home/_images/gallery-items/westerlund-2.jpg?t=tn992 992w, /files/live/sites/www/files/home/_images/gallery-items/westerlund-2.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/_images/gallery-items/westerlund-2.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/_images/gallery-items/westerlund-2.jpg?t=tn2400 2400w" sizes="100vw" /></noscript></figure> </div></div> </div> </div></div> </main> <div data-module-dynamic="scroll-affix" data-activate-on-scroll="true" class="back-to-top"> <a class="back-to-top-button" href="#body" data-module-dynamic="scroll-to" aria-label="back to top"> <span class="svg-sprite -back-to-top"> <svg role="img" focusable="false" aria-hidden="true"> <use xlink:href="#back-to-top"></use> </svg> </span> </a> </div> </section> <footer class="footer dark-background-"> <h2 id="h2-sr-only-footer" class="sr-only">Footer</h2> <div class="container-fluid"> <div class="row"> <nav aria-labelledby="h3-sr-only-3dfaf367-ce4b-41ac-9c54-e8af6192041c"> <h3 id="h3-sr-only-3dfaf367-ce4b-41ac-9c54-e8af6192041c" data-name="h3-sr-only-secondary-navigation" class="sr-only">Secondary Navigation</h3> <div class="col-md-2 hidden-xs hidden-sm footer__logo"> <a href="/home" class=" no-file-icon" > <img alt="Space Telescope Science Institute Logo" 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