gohomeman1 发表于 2012-5-1 22:45
?这个我也不太理解,按理说红移9的话,应该已经回溯了90%以上的宇宙时间了(越到宇宙早期,红移越大,宇宙 ...
有这样一句话:Redhifts, so defined, are used as shorthand for the distance to an astronomical object. For a galaxy with z = 1 for example, we observe its light at twice the wavelength at which it was emitted. Such an object would be about half way across the universe.
我觉得80%和这个half way,都是说的距离吧。
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