Picture of the Week 2025

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href="/public/teles-instr/paranal-observatory/surveytelescopes/vista/camera/"> VIRCAM </a></li><li class=""><a href="/public/teles-instr/paranal-observatory/surveytelescopes/vista/4most/"> 4MOST </a></li><li class=""><a href="/public/teles-instr/paranal-observatory/surveytelescopes/vista/surveys/"> The VISTA surveys </a></li><li class=""><a href="/public/teles-instr/paranal-observatory/surveytelescopes/vista/consortium/"> The VISTA consortium </a></li></ul></li><li class="submenu"><a href="/public/teles-instr/paranal-observatory/surveytelescopes/vst/"> VST <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-310" class="submenu-aim sublevel"><li class=""><a href="/public/teles-instr/paranal-observatory/surveytelescopes/vst/mirror/"> The VST mirrors </a></li><li class=""><a href="/public/teles-instr/paranal-observatory/surveytelescopes/vst/camera/"> OmegaCAM </a></li><li 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id="submenu-aim-318" class="submenu-aim sublevel"><li class=""><a href="/public/teles-instr/lasilla/swedish/simba/"> SIMBA </a></li></ul></li><li class="submenu"><a href="/public/teles-instr/lasilla/ntt/"> New Technology Telescope <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-320" class="submenu-aim sublevel"><li class=""><a href="/public/teles-instr/lasilla/ntt/efosc2/"> EFOSC2 </a></li><li class=""><a href="/public/teles-instr/lasilla/ntt/emmi/"> EMMI </a></li><li class=""><a href="/public/teles-instr/lasilla/ntt/irspec/"> IRSPEC </a></li><li class=""><a href="/public/teles-instr/lasilla/ntt/sofi/"> SOFI </a></li><li class=""><a href="/public/teles-instr/lasilla/ntt/soxs/"> SOXS </a></li><li class=""><a href="/public/teles-instr/lasilla/ntt/susi2/"> SUSI and SUSI2 </a></li></ul></li><li class="submenu"><a href="/public/teles-instr/lasilla/36/"> ESO 3.6-metre 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href="/public/teles-instr/lasilla/mpg22/pisco/"> PISCO </a></li><li class=""><a href="/public/teles-instr/lasilla/mpg22/wfi/"> WFI </a></li><li class=""><a href="/public/teles-instr/lasilla/mpg22/infrared-photometer-spectrophotometer/"> Infrared Photometer/Spectrophotometer </a></li></ul></li><li class="submenu"><a href="/public/teles-instr/lasilla/swiss/"> Swiss 1.2-metre Leonhard Euler Telescope <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-348" class="submenu-aim sublevel"><li class=""><a href="/public/teles-instr/lasilla/swiss/coralie/"> CORALIE </a></li></ul></li><li class=""><a href="/public/teles-instr/lasilla/rem/"> Rapid Eye Mount telescope </a></li><li class=""><a href="/public/teles-instr/lasilla/trappist/"> TRAnsiting Planets and PlanetesImals Small Telescope–South </a></li><li class="submenu"><a href="/public/teles-instr/lasilla/danish154/"> Danish 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href="/public/teles-instr/lasilla/tarot/"> Télescope à Action Rapide pour les Objets Transitoires </a></li><li class=""><a href="/public/teles-instr/lasilla/1mschmidt/"> ESO 1-metre Schmidt telescope </a></li><li class="submenu"><a href="/public/teles-instr/lasilla/152metre/"> ESO 1.52-metre telescope <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-362" class="submenu-aim sublevel"><li class=""><a href="/public/teles-instr/lasilla/152metre/bandc/"> Boller and Chivens Spectrograph </a></li><li class=""><a href="/public/teles-instr/lasilla/152metre/coude/"> Coudé Spectrograph </a></li><li class=""><a href="/public/teles-instr/lasilla/152metre/echelec/"> ECHELEC </a></li><li class=""><a href="/public/teles-instr/lasilla/152metre/rv-cass-spectrograph/"> RV Cass Spectrograph </a></li></ul></li><li class="submenu"><a href="/public/teles-instr/lasilla/1metre/"> ESO 1-metre 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href="/public/teles-instr/lasilla/05metre/double-channel-photometer/"> Double-Channel Photometer </a></li></ul></li><li class="submenu"><a href="/public/teles-instr/lasilla/coude/"> Coudé Auxiliary Telescope <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-374" class="submenu-aim sublevel"><li class=""><a href="/public/teles-instr/lasilla/coude/ces/"> CES </a></li></ul></li><li class=""><a href="/public/teles-instr/lasilla/marly/"> MarLy 1-metre telescope </a></li><li class="submenu"><a href="/public/teles-instr/lasilla/09metre/"> Dutch 0.9-metre telescope <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-377" class="submenu-aim sublevel"><li class=""><a href="/public/teles-instr/lasilla/09metre/walraven/"> Walraven Photometer </a></li></ul></li><li class=""><a href="/public/teles-instr/lasilla/t70/"> Swiss T70 telescope </a></li><li class="submenu"><a href="/public/teles-instr/lasilla/bochum/"> Bochum 0.61-metre telescope <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-380" class="submenu-aim sublevel"><li class=""><a href="/public/teles-instr/lasilla/bochum/bochum-scanner/"> Bochum Scanner </a></li><li class=""><a href="/public/teles-instr/lasilla/bochum/bochum-photometer/"> Bochum Photometer </a></li></ul></li><li class="submenu"><a href="/public/teles-instr/lasilla/danish05/"> Danish 0.5-metre telescope <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-383" class="submenu-aim sublevel"><li class=""><a href="/public/teles-instr/lasilla/danish05/danish-two-channel-hb-photometer/"> Two-Channel Hβ Photometer </a></li><li class=""><a href="/public/teles-instr/lasilla/danish05/danish-four-channel-uvby-photometer/"> Four-Channel uvby Photometer </a></li><li class=""><a href="/public/teles-instr/lasilla/danish05/danish-six-channel-uvby-hb-photometer/"> Six-Channel uvby–Hβ Photometer </a></li></ul></li><li class=""><a href="/public/teles-instr/lasilla/gpo/"> Grand Prisme Objectif telescope </a></li><li class=""><a href="/public/teles-instr/lasilla/swiss04/"> Swiss 0.4-metre telescope </a></li><li class=""><a href="/public/teles-instr/lasilla/marseille/"> Marseille 0.36-metre telescope </a></li><li class=""><a href="/public/teles-instr/lasilla/grb/"> GRB Monitoring System </a></li><li class=""><a href="/public/teles-instr/lasilla/mascara/"> MASCARA </a></li><li class=""><a href="/public/teles-instr/lasilla/blackgem/"> BlackGEM </a></li><li class=""><a href="/public/teles-instr/lasilla/extra/"> ExTrA </a></li><li class=""><a href="/public/teles-instr/lasilla/test-bed/"> Test-Bed 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href="/public/teles-instr/apex/p-artemis/"> P-ArTéMiS </a></li><li class=""><a href="/public/teles-instr/apex/pi230/"> PI230 </a></li><li class=""><a href="/public/teles-instr/apex/polka/"> PolKa </a></li><li class=""><a href="/public/teles-instr/apex/saboca/"> SABOCA </a></li><li class=""><a href="/public/teles-instr/apex/sepia/"> SEPIA </a></li><li class=""><a href="/public/teles-instr/apex/shefi/"> SHeFI </a></li></ul></li><li class="submenu"><a href="/public/teles-instr/alma/"> ALMA <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-411" class="submenu-aim sublevel"><li class=""><a href="/public/teles-instr/alma/antennas/"> Antennas </a></li><li class=""><a href="/public/teles-instr/alma/transporters/"> Transporters </a></li><li class=""><a href="/public/teles-instr/alma/interferometry/"> Interferometry </a></li><li class=""><a 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class="submenu-aim sublevel"><li class=""><a href="https://www.eso.org/public/science/event-horizon/"> First image of a black hole </a></li><li class=""><a href="https://www.eso.org/public/science/EHT-MilkyWay/"> First image of the Milky Way central black hole </a></li><li class=""><a href="https://www.eso.org/public/science/gc/"> More about the black hole at the galactic centre </a></li></ul></li><li class=""><a href="/public/science/grb/"> Gamma-Ray Bursts </a></li><li class=""><a href="/public/science/archive/"> Science Archive </a></li> </ul> </div> </div> </li> <li><a href="/public/events/">Events<span class="fa fa-angle-down level0-children-arrows"></span></a> <span class="mobile-children"> <span class="fa fa-angle-down"></span> </span> <div class="level1-wrapper"> <div class="level1"> <ul id="submenu-aim-436" class="submenu-aim"> <li class=""><a href="/public/events/press-evt/"> Press Events </a></li><li class="submenu"><a href="/public/events/special-evt/"> Special Events <span 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class="col-md-12"> <div class="archive-search outside"><form class="form-inline" role="form" action="/public/images/potw/" method="GET"><div class="form-group"><div class="input-group"><input id="id_archivesearch" type="text" value="" placeholder="Search Picture of the Week 2025..." name="search" class="form-control input-sm" /><span class="input-group-btn"><button class="btn btn-default btn-sm" type="submit"><span class="fa fa-search"></span></button></span></div></div></form></div> </div> </div> <div class="row no-page"> <div class="col-md-12"> <h1>Picture of the Week 2025 <a href="https://feeds.feedburner.com/eso_potw" class="listviewrsslink"><span class="fa fa-rss"></span></a></h1> </div> </div> <div class="row no-page"> <div class="col-md-12"> <a href="https://www.eso.org/public/outreach/newsletters/esonews.html" class="esonews_link">Subscribe to receive news from ESO in your language!</a> <div class="row news-list"> <div class="col-md-3 col-sm-6 col-xs-12"> <a href="/public/images/potw2507a/"> <div class="news-wrapper"> <div class="news-image"> <img class="img-responsive" src="https://cdn.eso.org/images/thumb350x/potw2507a.jpg"> </div> <div class="news-description"> <div class="news-id">potw2507 — Picture of the Week</div> <div class="news-title">Not too close encounters of the galactic kind</div> <div class="news-teaser"><strong>17 February 2025</strong>: This Picture of the Week shows NGC 3640, an unusual elliptical galaxy 88 million light-years away. The image, taken with the VLT Survey Telescope hosted at ESO’s Paranal Observatory, reveals a menagerie of galaxies of all shapes and sizes, ranging from slight blue smudges to the fried-egg shape of NGC 3640. But amidst this colourful cosmic neighbourhood, one thing stands out — this egg has a double yolk: a smaller galaxy that might be too close for its comfort. Throughout their extremely long lifetime, galaxies change. As they soar through space, they may steal gas and stars from other galaxies, or even engulf and merge with them. After these events, galaxies can become distorted, as exemplified by the misshaped NGC 3640 and the diffuse light around it. The galaxy is then left with ‘scars’ that hint at a violent past, which astronomers can use to know its past and present ...</div> </div> <div class="news-readmore">Read more</div> </div>  </a> </div> <div class="col-md-3 col-sm-6 col-xs-12"> <a href="/public/images/potw2506a/"> <div class="news-wrapper"> <div class="news-image"> <img class="img-responsive" src="https://cdn.eso.org/images/thumb350x/potw2506a.jpg"> </div> <div class="news-description"> <div class="news-id">potw2506 — Picture of the Week</div> <div class="news-title">The framework for greatness</div> <div class="news-teaser"><strong>10 February 2025</strong>: Bathed in the sunset light of Chile’s Atacama Desert, this Picture of the Week shows steady progress in the construction of ESO’s Extremely Large Telescope (ELT). From up here, the ELT’s white tube-like altitude structure is clearly the eyecatcher. The close-knitted truss structure at the bottom is the support cell of the ELT’s 39-m primary mirror, the largest telescope mirror ever made. The light it collects from the cosmos will bounce off to the secondary mirror, which will be held in the central ring seen at the very top of the picture. Light will then travel down again through the ELT’s central tower and its three additional mirrors, before it reaches the scientific instruments that will be located at the side of the telescope. At first glance, with no humans or bananas for scale, the steel structure might look modest in size. But the altitude structure alone is already more ...</div> </div> <div class="news-readmore">Read more</div> </div>  </a> </div> <div class="col-md-3 col-sm-6 col-xs-12"> <a href="/public/images/potw2505a/"> <div class="news-wrapper"> <div class="news-image"> <img class="img-responsive" src="https://cdn.eso.org/images/thumb350x/potw2505a.jpg"> </div> <div class="news-description"> <div class="news-id">potw2505 — Picture of the Week</div> <div class="news-title">Comet C/2024 G3 (ATLAS) wagging its tail</div> <div class="news-teaser"><strong>3 February 2025</strong>: “Comets are like cats: they have tails, and they do precisely what they want,” wrote David H. Levy, an amateur astronomer who discovered 23 comets. These cosmic visitors can indeed be pretty capricious. We never know exactly how long a comet will be visible in the sky. In January, the southern hemisphere had a captivating visitor in the form of the comet C/2024 G3 (ATLAS). It looks magnificent in this Picture of the Week by Juan Beltrán, one of our engineers, who took it on 20 January at our Paranal Observatory in Chile. Just last year, another comet was also caught on camera visiting ESO Headquarters in Garching bei München, Germany. These so-called non-periodic comets only stick around in our skies for a few weeks. If you miss your photo opportunity, your next chance may be a few thousand years later… As comets approach the Sun they warm up, and ...</div> </div> <div class="news-readmore">Read more</div> </div>  </a> </div> <div class="col-md-3 col-sm-6 col-xs-12"> <a href="/public/images/potw2504a/"> <div class="news-wrapper"> <div class="news-image"> <img class="img-responsive" src="https://cdn.eso.org/images/thumb350x/potw2504a.jpg"> </div> <div class="news-description"> <div class="news-id">potw2504 — Picture of the Week</div> <div class="news-title">Revealing a filament from the cosmic web</div> <div class="news-teaser"><strong>29 January 2025</strong>: Is there an invisible web of dark matter surrounding us? Its influence can be observed across the cosmos, but the web remains unseen… for the most part. This Picture of the Week shows the clearest image yet of a filament from this cosmic web. The filament was imaged with ESO’s Very Large Telescope, and is shown here in purple overlaid on a background image from the NASA/ESA Hubble Space Telescope. Made of gas clumped together by the influence of dark matter, the filament stretches out for 3 million light-years, connecting two distant galaxies in the early Universe. Around 85% of all matter in the Universe is actually dark matter. Dark matter is invisible, but the gas around it is not. This gas glows extremely faintly though, making these structures very difficult to observe. But after about 150 hours of observations, a team of astronomers led by Davide Tornotti, a PhD ...</div> </div> <div class="news-readmore">Read more</div> </div>  </a> </div> </div> <div class="row news-list"> <div class="col-md-3 col-sm-6 col-xs-12"> <a href="/public/images/potw2503a/"> <div class="news-wrapper"> <div class="news-image"> <img class="img-responsive" src="https://cdn.eso.org/images/thumb350x/potw2503a.jpg"> </div> <div class="news-description"> <div class="news-id">potw2503 — Picture of the Week</div> <div class="news-title">New laser-sharp vision for Paranal’s facilities</div> <div class="news-teaser"><strong>20 January 2025</strong>: In this Picture of the Week, taken at the ESO Headquarters in Germany, you see the first of nine new lasers that are currently being built for two of ESO’s Paranal Observatory facilities, in Chile’s Atacama Desert. But why do telescopes need lasers? Not for shooting aliens, that’s for sure. Lasers are part of the telescopes’ adaptive optics system. As ESO’s observatories are ground-based, the turbulence in the atmosphere can blur our view of the cosmos, and with adaptive optics we can cancel this blurring out, in real time. The laser creates an artificial star by exciting sodium atoms in the atmosphere, around 90 kilometers high. A computer measures how the atmosphere distorts the light of this star and steers a shape-shifting mirror in the telescope to compensate for it. The result: sharper images. The light itself is generated in the laser source — the large grey box at the ...</div> </div> <div class="news-readmore">Read more</div> </div>  </a> </div> <div class="col-md-3 col-sm-6 col-xs-12"> <a href="/public/videos/potw2502a/"> <div class="news-wrapper"> <div class="news-image"> <img class="img-responsive" src="/public/archives/videos/thumb350x/potw2502a.jpg"> </div> <div class="news-description"> <div class="news-id">potw2502 — Picture of the Week</div> <div class="news-title">Jupiter’s clouds are not made of ammonia ice</div> <div class="news-teaser"><strong>13 January 2025</strong>: Astronomers have long thought that the upper clouds of Jupiter, which create the planet’s iconic pale brown belts, are made of frozen ammonia. But a new study, that brought together amateur and professional astronomers, has shown that these clouds are actually located lower in the atmosphere than we thought and are made of something completely different: most likely ammonium hydrosulphide mixed with smog. Citizen scientist Steve Hill previously showed that he could map the planet’s atmosphere by using only specially coloured filters and his backyard telescope. These results provided initial clues that the clouds were too deep within Jupiter’s warm atmosphere to be consistent with clouds made of ammonia ice. To check, Hill joined forces with Patrick Irwin at Oxford University, whose team had previously used the sophisticated MUSE instrument on ESO’s Very Large Telescope (VLT) to study the atmosphere of gas giants. MUSE is capable of scanning the atmosphere ...</div> </div> <div class="news-readmore">Read more</div> </div>  </a> </div> <div class="col-md-3 col-sm-6 col-xs-12"> <a href="/public/images/potw2501a/"> <div class="news-wrapper"> <div class="news-image"> <img class="img-responsive" src="https://cdn.eso.org/images/thumb350x/potw2501a.jpg"> </div> <div class="news-description"> <div class="news-id">potw2501 — Picture of the Week</div> <div class="news-title">Perfectly framed</div> <div class="news-teaser"><strong>6 January 2025</strong>: Astronomers mostly focus their attention on the sky, but sometimes it’s worth looking around our planet, too. At night, the star-spangled sky over Chile’s Atacama Desert steals the limelight, but once the barren landscape basks in sunlight again, other marvels are revealed. This Picture of the Week, for instance, could easily feature in a travel magazine. It is taken from Pukará de Quitor (Fort of Quitor), a stone fortress built centuries ago by the Licán Antai community, also known as Atacameños. You find it near San Pedro de Atacama, not far from where the Atacama Large Millimeter/submillimeter Array (ALMA) is housed, the radio telescope array which ESO operates together with its international partners. In this picture, the arch of the fortress is framing the Licancabur volcano, which looms up next to Chile’s border with Bolivia. On the mountain, other archaeological sites have been found, and its summit crater hides one ...</div> </div> <div class="news-readmore">Read more</div> </div>  </a> </div> </div> <div class="row statusbar"><div class="col-md-3"> Showing 1 to 7 of 7 </div><div class="col-md-6"><div class="text-center"><ul class="pagination"><li class="active"><a href="/public/images/potw/archive/year/2025/list/1/">1</a></li></ul></div></div><div class="col-md-3 prev-next"></div></div><div class="row"><div class="col-md-12"></div></div> <div class="copyright"> <a href="/public/outreach/copyright/">Usage of ESO Images, Videos, Web texts and Music</a><br /> </div> </div> </div> </div> </div> </div>  <div class="row footernote"> <div class="col-xs-12 col-md-3"> <a href="mailto:information@eso.org">Send us your comments!</a> </div> <div class="col-xs-12 col-md-3"> <a href="/public/outreach/newsletters/esonews/">Subscribe to receive news from ESO in your language</a> </div> <div class="col-xs-12 col-md-3"> <a href="https://www.cdn77.com">Accelerated by CDN77</a> </div> <div class="col-xs-12 col-md-3"> <a href="/public/about-eso/privacy/">Terms & Conditions</a> </div> </div> <link href="/public/archives/djp/css/extras.d3e54451ebbb.css" rel="stylesheet" type="text/css" /> <script type="text/javascript">var MEDIA_URL = "/public/archives/"</script> <script type="text/javascript" src="/public/archives/djp/js/main.86aaf133ddd1.js" charset="utf-8"></script> </div>  <div id="social-share" class="hidden-print"> <div class="link facebook" data-toggle="tooltip" data-placement="right" title="Share on Facebook"> <a href="https://www.facebook.com/sharer/sharer.php?u=https://www.eso.org/public/images/potw/archive/year/2025/" target="_blank" rel="noopener noreferrer"><i class="fa-brands fa-facebook-f" aria-hidden="true"></i></a> </div> <div class="link twitter" data-toggle="tooltip" data-placement="right" title="Share on X/Twitter"> <a href="https://twitter.com/intent/tweet?url=https://www.eso.org/public/images/potw/archive/year/2025/&text=&via=ESO" target="_blank" rel="noopener noreferrer"><i class="fa-brands fa-x-twitter"></i></i></a> </div> <div class="link pinterest" data-toggle="tooltip" data-placement="right" title="Share on Pinterest"> <a href="https://pinterest.com/pin/create/button/?url=https://www.eso.org/public/images/potw/archive/year/2025/&media=&description=" target="_blank" rel="noopener noreferrer"><i class="fa-brands fa-pinterest-p" aria-hidden="true"></i></a> </div> <div class="link print" data-toggle="tooltip" data-placement="right" title="Print"> <a href="javascript:window.print()" target="_blank" rel="noopener noreferrer"><i class="fa fa-print" aria-hidden="true"></i></a> </div> <div class="link email" data-toggle="tooltip" data-placement="right" title="Share by email"> <a href="mailto:%20?subject=ESO — Picture of the Week 2025&body=https://www.eso.org/public/images/potw/archive/year/2025/" target="_blank" rel="noopener noreferrer"><i class="fa-regular fa-envelope" aria-hidden="true"></i></a> </div> </div> <script> $('[data-toggle="tooltip"]').tooltip(); </script> <input type='hidden' name='csrfmiddlewaretoken' value='CtPI8DQRHoLCgXIC4VWAvBkr2jA0COIdk4n98JOgZ6vm049pfJszjw4xC49D06WV' /> </body> </html>

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