Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993s%26t....85...22d&link_type=abstract
Sky & Telescope (ISSN 0037-6604), vol. 85, no. 4, p. 22-25.
Astronomy and Astrophysics
Astronomy
Galactic Clusters, Galactic Evolution, Hubble Space Telescope, Spaceborne Astronomy, Astronomical Spectroscopy, Big Bang Cosmology, Elliptical Galaxies, Red Shift, Spiral Galaxies
Scientific paper
NASA's HST has gathered much observational data to date that is relevant to questions of cosmic evolution; galaxies at a redshift of 0.4, for example, can be clearly characterized as to shape, thereby establishing that the common forms of nearby galaxies were already in evidence 4 billion years ago. It is also noted that while spiral galaxies constituted 30 percent of galaxies 4 billion years ago, they make up only 5 percent of galaxies in nearby rich clusters. A galaxy cluster appears to have been detected at a redshift of 2.055, corresponding to an evolutionary period 10 billion years ago.
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