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Cosmos Redshift 7 (also known as COSMOS Redshift 7, Galaxy Cosmos Redshift 7, Galaxy CR7 or CR7) is a high-redshift Lyman-alpha emitter galaxy (meaning CR7 is one of the oldest, most distant galaxies), in the constellation Sextans, about 12.9 billion light travel distance years from Earth, reported to contain the first stars (first generation; Population III)—formed soon after the Big Bang during the reionisation epoch (redshift, z ∼ 6−7),[1] when the Universe was about 800 million years old—to have provided the chemical elements (like oxygen, nitrogen, carbon, calcium and iron) needed for the later formation of planets and life as it is known.[1][2][3][4][5]

Cosmos Redshift 7
Eso1524aArtist’s impression of CR7 the brightest galaxy in the early Universe.jpg
Artist’s impression of CR7.
Observation data (Reionization epoch)
Constellation Sextans
Right ascension 10h 00m 58.005s[1]
Declination +01° 48′ 15.251″[1]
Redshift 6.604[1]
Distance 12.9 billion light-years[2]
Type Lyman-alpha emitter[1]
Notable features Galaxy Cosmos Redshift 7 is reported to be three times brighter than the brightest distant galaxy known up to the time of its discovery and to contain some of the earliest first stars that produced the chemical elements needed for the later formation of planets and life as it is known.[1]
Other designations
COSMOS Redshift 7; Galaxy Cosmos Redshift 7; Galaxy CR7; CR7
See also: Galaxy, List of galaxies



Galaxy Cosmos Redshift 7 contains old Population II (metal-poor) and Population III (extremely metal-poor) stars, according to astronomers,[1][2] and is three times brighter than the brightest distant galaxies (redshift, z > 6)[1][6] detected up to the time of its discovery.[3][5]


Astronomers led by David Sobral from Lisbon and Leiden used the Very Large Telescope (VLT) at the European Southern Observatory—with help from the W. M. Keck Observatory, Subaru Telescope and the NASA/ESA Hubble Space Telescope—made the discovery.[5] The research team included members of the University of California, Riverside,[5] University of Geneva, University of Leiden and University of Lisbon.[1] The name of the galaxy (Cosmos Redshift 7 Galaxy) was inspired by Portuguese and Real Madrid footballer Cristiano Ronaldo, who is also popularly known as CR7.[3][7][8][9]

See alsoEdit


  1. ^ a b c d e f g h i j Sobral, David; Matthee, Jorryt; Darvish, Behnam; Schaerer, Daniel; Mobasher, Bahram; Röttgering, Huub J. A.; Santos, Sérgio; Hemmati, Shoubaneh (4 June 2015). "Evidence For POPIII-Like Stellar Populations In The Most Luminous LYMAN-α Emitters At The Epoch Of Re-Ionisation: Spectroscopic Confirmation". The Astrophysical Journal. 808 (2): 139. arXiv:1504.01734 . Bibcode:2015ApJ...808..139S. doi:10.1088/0004-637x/808/2/139. 
  2. ^ a b c Overbye, Dennis (17 June 2015). "Astronomers Report Finding Earliest Stars That Enriched Cosmos". New York Times. Retrieved 17 June 2015. 
  3. ^ a b c Staff (17 June 2015). "ESO1524 — Science Release - Best Observational Evidence of First Generation Stars in the Universe". European Southern Observatory. Retrieved 17 June 2015. 
  4. ^ Staff (17 June 2015). "Brightest galaxy and first-generation stars". Earth & Sky. Retrieved 17 June 2015. 
  5. ^ a b c d Pittalwala, Iqbal (17 June 2015). "Astronomers Find Best Observational Evidence of First Generation Stars in the Universe". University of California, Riverside. Retrieved 17 June 2015. 
  6. ^ Matthee, Jorryt; Sobral, David; et al. (21 July 2015). "Identification of the brightest Lyalpha emitters at z=6.6: implications for the evolution of the luminosity function in the re-ionisation era". MNRAS. 451: 4919–4936. arXiv:1502.07355 . Bibcode:2015MNRAS.451.4919M. doi:10.1093/mnras/stv947. 
  7. ^ Staff (17 June 2015). "Traces of Earliest Stars That Enriched Cosmos Are Spied". New York Times. Retrieved 17 June 2015. 
  8. ^ Staff (18 June 2015). "Cristiano Ronaldo: CR7 name given to discovered galaxy". BBC. Retrieved 18 June 2015. 
  9. ^ Staff (18 June 2015). "Cristiano Ronaldo: CR7 gets his own galaxy". CNN. Retrieved 18 June 2015. 

External linksEdit