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银河系[Galaxies]

   ¤〖天文〗2005-3-19 20:9
The most distant galaxy identified has a relativistic redshift of 4.38 (corresponding to an age of 14 Gy). It is in the foreground of a quasar BR 1202-0725 in the constellation Virgo (Appenzeller 1996, Lu et al . 1996), and appears to be a spiral galaxy. The formation of a spiral galaxy by a universe only 10% of its current age is problematic for cosmologists, however. The number of galaxies visible from the ground is , while the Hubble Space Telescope can see
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