CINXE.COM

<!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="robots" content="noindex,nofollow"><meta name="viewport" content="width=device-width,initial-scale=1"><style>*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.15;-webkit-text-size-adjust:100%;color:#313131;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji}body{display:flex;flex-direction:column;height:100vh;min-height:100vh}.main-content{margin:8rem auto;max-width:60rem;padding-left:1.5rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{font-size:1.5rem;font-weight:500;line-height:2.25rem}@media (width <= 720px){.h2{font-size:1.25rem;line-height:1.5rem}}#challenge-error-text{background-image:url(data:image/svg+xml;base64,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);background-repeat:no-repeat;background-size:contain;padding-left:34px}@media (prefers-color-scheme:dark){body{background-color:#222;color:#d9d9d9}}</style><meta http-equiv="refresh" content="390"></head><body class="no-js"><div class="main-wrapper" role="main"><div class="main-content"><noscript><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></noscript></div></div><script>(function(){window._cf_chl_opt={cvId: '3',cZone: "esahubble.org",cType: 'managed',cRay: '8f0ad708b9d19d06',cH: 'an77y4nOFaIaDkW7hktBFZIDjjnBAs6yKJdROotpcw8-1733976367-1.2.1.1-UZkVEvzoGzJHai5YEB2GZtb7PjOKG1XQiIVJ9YIpOzUFa8DCIvme4x9In7Hp.gsx',cUPMDTk: "\/images\/potw2140a\/?__cf_chl_tk=Vqn1AFDy4bBmwMac.Lu.wqyya.g_EKRx3NAYH2Oi8nI-1733976367-1.0.1.1-I0qCFo7Fjr3upoxw6I07IAcdJ2ctXtMtq9f.S_i5fIg",cFPWv: 'g',cITimeS: '1733976367',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/images\/potw2140a\/?__cf_chl_f_tk=Vqn1AFDy4bBmwMac.Lu.wqyya.g_EKRx3NAYH2Oi8nI-1733976367-1.0.1.1-I0qCFo7Fjr3upoxw6I07IAcdJ2ctXtMtq9f.S_i5fIg",md: "FGNJ29EVhGP_tp6q_mx4mGqGOTs.pr5SS18zGoExNyY-1733976367-1.2.1.1-e.AkgiKHevDqMvEv3ouNZqGE3J.C29mT7GKvP6wqxkQFg7p5tlETqB5u6v_3sB0HdhBZr9D0QK6WinLM2aMK6X3ec1fjvgOzraX0HgrQAt.7cs9SHpvpT8Roedob204octVMUG5LqFFiKngxRjQiyB.2G2e2Y1LfadpBWDZzwsuj20S9gwltm1Qw5HscZXFsNLYxxShkvpO7k6CoPETptJ7FviXLBwsQnnaaOpzTJwbwbycUQTN385tAPko6C7pg0Gjy8IEKGJVN00hTHb_RzAOTWxMTVlHVods4u9bUaFBe.wsizCNXzZLkEBtZjTWLpQB0vrLgx9g7AHZGmDFc8CYOh8gzzGGo3KNCKMvoHv97Wc82wsQgZz62b5kJ4CcdEPIi_t3kA96Ch0CBnfZSfabzFPovTg_1WeQdscoJoChcLXXo86DM3Wtt_Ppoqk5Z__HDDF_HNxu2_NC457YXSiOUjIOMtLwdj7EYl_ZhtbwmuS_WCcURy0aVGr8WsnlmYTdHcV_aPkIaw42iRWmipKKZ7hcMJFFZNpICP7W.ljeF0SwvvdAuC.Rmfa.bfSMKanyAfbvJiULiHgH_v9OVHuWG_FIXEyMNAyrUNA8KZ7V5Cg57OQ_SbCA3egm37XBDMmHY9tCsTGGHZIvrYmzPnqBJYvxWASxp9xpHwLrIBJwmsDCF7EMD4raAICmslmtqfFnSI4JBvAXaVphT2c9K0JNUgvqOW4CROWI36JW8LFXRpazZxBfrWj8CsDVHPao12y0oKlotzAiIQmaNJH6AuTWfXU9sytqn7a9p6BCMAiJ.AWocdXhipBxYAYECjFMlalme1N0GhPAM4rFUqoKR0RSCAxsB.5lPEFTCJoQtJF0wb9V7B1RzO0zIFnHCy_8.Raniacgos92Tx5atZQb6EArePosSNiwNdglT4obnM7owzbX1uspqn7uFlr85b3sObBX2TIhO8OWasq5AFtKWvbacNImuoyXf69.UUp.DtEXNfKZB5Y33Wfh6cZQtKUnL_tgeDseYcflP2Rym8V.LtrdSn7Pl2ffQ_YHJYfAthobaHf9SBrDhsGZi33GHDnGJC5OL7cpMkbVE7u2obuvvLXgoYkB59qJ9.URNF_WZJjEo8PDKiUFtV5LuGuJ7R0SoPwqBCHWtwPYeGembP.TLogzgk5rqOqgwVP4dcRMt_DrtHtRW.xfl1lDsRngsN6eFXOiGIqeWKD15X5Kj9z_RJJJzzIxz03UBK4hDBGxqHRB1pGuKO4HLAynvTA5ox9x5LhCj_hbPYOTCrPMCLhQdzufCdOsJSXGPhVwChTsL7Vr3NCh3ZYRWmE._OyJ4hfxMiFYOEK6kJl5PqTnuyl_kUp8hT.KAVFTAjj3e.k1eCyVq3jdhIkPeNi50vdjBa6sS7mEEkYlfAVHeXlBjm02Y3FhAGefX_G5p_ksbdZIiJdEjoH5KzMTPtfh76YcAems6DNR77fbfLSnrcXSfC_VkB0t4ZmAJxmRpQeYSLzaw9DhmoesbVvtS1kz1p72hXHN1AYe3fcEgXaSF13XRaJRXuC9c0jnllz_v5jxcMlF0aN9SZ5buROP2RkvCODuCoBSk28k9XHXLRs6HzaSEHBfALm_mw15.5w8aAlzPhVux_4AXctoG9jGJt4Mz8ojVQ_l4vuamvTEQXowPZKBY6LFUqHrZ1y40hmfmQGVZAJ.z65FhV7xoudWJQ71I1Tx8gD8t4WbK_fdpU510J82Qhnfj6Zn__OaQTfSVo7bbKCNrmin0HU6Op4TSbLSpwMDBhwrQR4RV0NNKKAuYSHZTDV0tQWzxOg7BFa1s1W0e940WGsMCqwi_Yyspk0_wEpOVIyqskkon0oIb..pZhlMcxZBVgFG0TeQsoWZbK5pmY0EKUQPfyNSZ5f3EzVIaZGI7GEUIovsYWzNBmvbp2XKz56C8FBSYusKWeImn_TPEwTOFPn9uk.CE_s0q0Tqm4a8KwyFWvnYJFtW76W9dfaOFLCCexnwRGbSiziuDoABsAsWEWBunHZQOrnMZfgrKrfuxBM2NFafyN_CyvFwhldGXoZacePgPQw920NNilI62qQ0Ny4JyqTXlKwPs7lhZZ_D0rWv7jRNSImbvhpNCOcXSuZmzeUcVFyShTZ5VwPhhXb8f46AnfylYOuZReqt7fgXhSdwUnZh5EGLJQX_iLNyy5izhi1rOoxsmCCKftr9951UEcrto3ygG5FO67aieFeoARaQYdMBzr0.vVxdb.DLSEWbuHJh10qFeU6O8g9Kya9pju.VKBAd46vnc4NbNlIFhimOJ_pU6FUGQf9rC8aoXsfACPLEilvQbeH6HTpTYSAG4fJ6fxHb98Pwpsemz1dMz._tE_fPj5ai0khiwc3GmgqE5J.4aVvZTg7JF68qQDZSCGLdLXWkAo9EUa335U0KbwTiK1wbQevOAL2P6vXmSYXIz.G5etl1r02B_ZLKFv5Jmktxd56vbsFoc5WFeqLgPjAmzmMqVvvZHC3ju2RtmlmGz1NkN_iS5qXnjyrL94dM_nszYP5CfeqoG15kfkowcHZTNi_qqXSHehhTE.EfO897XxjIM3HdfmV4PA7Lcg0mVOtVy4KlO3Wpip5TPGe0qxDA_B5vfUfJ3ijmexEwLi2K9PrXLDtTGh1CSXS4T1GLZByS.7rS72Btam2now0r2Q6oSo6dBXLLpgA6CMFqqELxrx9S512vhhX3Ze3SCgllsKrD41zw12PHzm.tKvHWiR8bqfnmAqZd57EzxFETSwRobt8m34XqA81Jgv9rtTaA3IIHOx7nhhstFnzCZu6T1rYyG",mdrd: "h.R_IlYc5hcAI6AVogvl.Jfmmmv_dCNnTfR.2joA6UY-1733976367-1.2.1.1-HliLj6gN_YVORWHs3LoV.dhZdj7RpNQBaxDzueSP9H817otS990bvNpqCiM842kI15dDSzT06ys5..iTcF.b.A2iIsxKM7LcQw.dmjzNZ7N88hg5nFn99H9.0cOiY1iZfJxaeMfsUjunKlOQ1X7.T2ghi3r.KD9df65ROXZ3uUPx8d4mbq0dAQMdRk6_6ZMmU0_JJ8ZQpy1EOBQ3ZWsnI88lZotzOOf3d2rnh3DBdN4beCovKB7nNkOFdpUOQz5xfvVTllBxUh_6A3IrYdV6FS2TcjkYHVkbl_7mljJxc6ZtUMYUzqx7TiFgm0Pi7MuJLiodkwlm_olg93Lrc2DLVxLHfDr99MtJoIeOq6Me4ME3ObeNxROwBujncEHGKUdzwEkVaSjDgZ44pX1dRiizG7Flwl.1qD3Od6jPWj6DZwUPTJ715Ed9OZcUv3EHY540AAqeX4k8E5_PeQgfPJ0VIpFCExULg57dTZahjrtL_A88crfaj4s0yqn.9T7XE4D1yeFWRRlK8WE54Ai8KD2I7TmNCTgieGO9rEd8mJLsYQXAGChVsW2QXHQYNC7YhFy4eXc.u6c5GlneP2xf4HzMv43WiZj5iZdXCmaCpiDvbNjRYW8e5D_dMc3Gg04EsZRr7YBdnqcFLBYMdivbrtcHczWcI_B4Gr6Lb9Sn9.U8RHFtRkCcCxtvSQ76vyprf3VwIqDll9wzMpbdMiCA.XaAaN3O.kteRh89mgAif70uJjsG5_epgCcxcnMDm8r5UnQrNgfMf2sNmKCX8AxwRz1huzutUtg0.JGZThvTMt6Mdxbez5iNsbHKJIyousUYv3hTIL2Qm0Wq.FSp11rH_N9Z2BQmF1vcgibK1FNuRp7zR00kzLqGt9D5id1h8dqtkxrmE7f8wyeEgZND4HFBysLNMHvH1Zm3iaW.TeliG81vYkb4EHtyEjqZYBIwpBRSO9L1cxiqs7aMx590L1Rv8pn_.BPJJAME9UFkPWKOdT1vLfnWHySJ9X8MdL3OChya5IvDrDFr1.sUBCWNkUQp3NGFEqzmRBPSpx4psfrNGOImx9oFhmpiEXFMhYOysz9F_JRIIfVDMl_H0pmQzo_BmkFYiI607eOwb9yZKtoQpqGumcQUm125iGhUcNaldCM2L0Pe3FOYizs04VewUl0m9tpUvuHet6P80Lpf.mib8WGtD8IBqTmQcZUuzBFF1tOejzOSQa_YOHx0qJ65e8IjHYnn0LqIndea08dayxMizrDvI5zmT70uBphSig8v1JWpfChKn9sC.BemJXezQbjee_N_bAhYSnM4a.qRFM74XOY3EfYeq3jqAciuwS6um7WWcq61e.rYzBdCxxK4ZGiVxVRrHs9Wysd5U9uiovYV3sN6x79hQV1vcNZDHLitqjX1wQ.yQiBWO2vo0Fp3o8vgDyGcyldGcS9.ZFx2u44hDAqrDmVPslywt0gy3yFbUZhgXRdkBje7YaL7qVPiDMg2nu846zRG8Fyo.GRqK8dZEVuX6TUNkizF07KyXUb4A7Za7BUnE1s25wsl0S3NAQMDQTkv3bGlw8aLnwdU7SpdM6yty95VEdiJQ4mCqDwgAxFL8PMHCXC1p38aZGyKKiVwAaSR7LtBsZz3NkuM5YAIhucnYRePPVTbN_Hmrm0Hps3rDUgU0zH2c2Kr1WfZ90394IvenU0y8lSdVmylHNODurM.XvkB8s.pTLz2_fkC7Y9_hpWad8UexwvwAjR3B5ek6tMtQOao4Q0T2sGbZwy_7JiZJqLlzBwEbk1RhT72zjCrLMF7zrlRVcEpVyZZ6xRb6v0JLXsGSoAEe9wzKbE3HajzDamI74H0pvf689wdXmdVLHmMx7c2cAyQkmf3Nhu7HMGwwoA_WTh.aCp6doX6lgESBMW.MzszVzBugyhacJugz_WNshxqoAquoMPZymIq0hs25vWcduHOLQpjXVio4pW_NhXKWypp2O74WBwz9Bn3ANif"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=8f0ad708b9d19d06';window._cf_chl_opt.cOgUHash = location.hash === '' && location.href.indexOf('#') !== -1 ? '#' : location.hash;window._cf_chl_opt.cOgUQuery = location.search === '' && location.href.slice(0, location.href.length - window._cf_chl_opt.cOgUHash.length).indexOf('?') !== -1 ? '?' : location.search;if (window.history && window.history.replaceState) {var ogU = location.pathname + window._cf_chl_opt.cOgUQuery + window._cf_chl_opt.cOgUHash;history.replaceState(null, null, "\/images\/potw2140a\/?__cf_chl_rt_tk=Vqn1AFDy4bBmwMac.Lu.wqyya.g_EKRx3NAYH2Oi8nI-1733976367-1.0.1.1-I0qCFo7Fjr3upoxw6I07IAcdJ2ctXtMtq9f.S_i5fIg" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>