Editing Sextans (section)

==COSMOS project==
{{Gallery |align=center |title= |width=200 |height=200 |captionstyle=text-align:center;
|File:A gigantic cosmic bubble.tif|COSMOS-Gr30 is a particularly dense region in space that contains 10 individual galaxies<ref>{{cite web|title=A gigantic cosmic bubble|url=https://www.eso.org/public/images/potw1746a/|website=www.eso.org|access-date=13 November 2017}}</ref>
|File:Eso1524aArtist’s impression of CR7 the brightest galaxy in the early Universe.jpg|[[Cosmos Redshift 7]], brightest [[galaxy]] in the early [[universe]], is located in the constellation Sextans (artist concept)}}

[[Sextans B]] is a fairly bright [[dwarf irregular galaxy]] at magnitude 6.6, 4.3 million [[light-year]]s from [[Earth]]. It is part of the [[Local Group]] of galaxies.{{sfn|Levy|2005|p=178}}

[[CL J1001+0220]] is as of 2016 the most distant-known [[galaxy cluster]] at [[redshift]] z=2.506, 11.1 billion light-years from Earth.<ref name=AJ-828-1>{{cite journal |arxiv=1604.07404 |doi=10.3847/0004-637X/828/1/56 |title=Discovery of a galaxy cluster with a violently starbursting core at z=2.506 |journal=The Astrophysical Journal |volume=828 |number=1 |year=2016 |last1=Wang |first1=Tao |last2=Elbaz |first2=David |last3=Daddi |first3=Emanuele |last4=Finoguenov |first4=Alexis |last5=Liu |first5=Daizhong |last6=Schrieber |first6=Corenin |last7=Martin |first7=Sergio |last8=Strazzullo |first8=Veronica |last9=Valentino |first9=Francesco |last10=van Der Burg |first10=Remco |last11=Zanella |first11=Anita |last12=Cisela |first12=Laure |last13=Gobat |first13=Raphael |last14=Le Brun |first14=Amandine |last15=Pannella |first15=Maurilio |last16=Sargent |first16=Mark |last17=Shu |first17=Xinwen |last18=Tan |first18=Qinghua |last19=Cappelluti |first19=Nico | last20=Li |first20=Xanxia|page=56 |bibcode = 2016ApJ...828...56W |s2cid=8771287 |doi-access=free }}</ref>

In June 2015, astronomers reported evidence for [[Metallicity#Stars|population III stars]] in the [[Cosmos Redshift 7]] [[galaxy]] (at ''z'' = 6.60) found in Sextans. Such stars are likely to have existed in the very early [[universe]] (i.e., at high redshift), and may have started the production of [[chemical element]]s heavier than [[hydrogen]] that are needed for the later formation of [[planet]]s and [[life]] as we know it.<ref name="AJ-20150604">{{cite journal |last1=Sobral |first1=David |last2=Matthee |first2=Jorryt |last3=Darvish |first3=Behnam |last4=Schaerer |first4=Daniel |last5=Mobasher |first5=Bahram |last6=Röttgering |first6=Huub J. A. |last7=Santos |first7=Sérgio |last8=Hemmati |first8=Shoubaneh |title=Evidence For POPIII-Like Stellar Populations In The Most Luminous LYMAN-α Emitters At The Epoch Of Re-Ionisation: Spectroscopic Confirmation |date=4 June 2015 |journal=[[The Astrophysical Journal]] |doi=10.1088/0004-637x/808/2/139 |bibcode=2015ApJ...808..139S |volume=808 |issue=2 |pages=139|arxiv = 1504.01734 |s2cid=18471887 }}</ref><ref name="NYT-20150617">{{cite news |last=Overbye |first=Dennis |author-link=Dennis Overbye |title=Astronomers Report Finding Earliest Stars That Enriched Cosmos |url=https://www.nytimes.com/2015/06/18/science/space/astronomers-report-finding-earliest-stars-that-enriched-cosmos.html |date=17 June 2015 |work=[[New York Times]] |access-date=17 June 2015 }}</ref>
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