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Hubble Space Telescope
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=== Cosmic Evolution Survey (COSMOS) === The [[Cosmic Evolution Survey]] (COSMOS)<ref name="Cosmic Evolution Survey COSMOS">{{Cite web|url=http://cosmos.astro.caltech.edu/|title=Home Page|website=COSMOS|access-date=August 31, 2019|archive-date=January 5, 2016|archive-url=https://web.archive.org/web/20160105073739/http://cosmos.astro.caltech.edu/|url-status=live}}</ref> is an astronomical survey designed to probe the formation and evolution of galaxies as a function of both cosmic time (redshift) and the local galaxy environment. The survey covers a two square degree equatorial field with spectroscopy and X-ray to radio imaging by most of the major space-based telescopes and a number of large ground based telescopes,<ref>{{Cite web|url=https://cosmos.astro.caltech.edu/page/astronomers|title=For Astronomers|website=COSMOS|access-date=November 2, 2020|archive-date=October 25, 2020|archive-url=https://web.archive.org/web/20201025190033/http://cosmos.astro.caltech.edu/page/astronomers|url-status=live}}</ref> making it a key focus region of extragalactic astrophysics. COSMOS was launched in 2006 as the largest project pursued by the Hubble Space Telescope at the time, and still is the largest continuous area of sky covered for the purposes of mapping deep space in [[Deep field|blank fields]], 2.5 times the area of the moon on the sky and 17 times larger than the largest of the CANDELS regions. The COSMOS scientific collaboration that was forged from the initial COSMOS survey is the largest and longest-running extragalactic collaboration, known for its collegiality and openness. The study of galaxies in their environment can be done only with large areas of the sky, larger than a half square degree.<ref>{{Cite web|url=http://hubblesite.org/contents/news-releases/2007/news-2007-01|title=Hubble Maps the Cosmic Web of "Clumpy" Dark Matter in 3-D|website=HubbleSite.org|publisher=[[Space Telescope Science Institute]]|access-date=November 2, 2020|archive-date=July 15, 2022|archive-url=https://web.archive.org/web/20220715150152/https://hubblesite.org/contents/news-releases/2007/news-2007-01.html|url-status=live}}</ref> More than two million galaxies are detected, spanning 90% of the age of the [[Universe]]. The COSMOS collaboration is led by [[Caitlin Casey]], [[Jeyhan Kartaltepe]], and Vernesa Smolcic and involves more than 200 scientists in a dozen countries.<ref name="Cosmic Evolution Survey COSMOS" />
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