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发帖数: 67 | 1 In cosmology, Redshift may be one of the few well-known terms to the
general public. Yet to understand the real meaning of it needs a bit
thinking.
How many redshifts are out there?
There are two kinds of photon redshift in the literature, a
gravitational and a cosmological one. Gravitional redshift arises
when light moves away from a static massive object, like the earth.
It is quite small generally. Cosmological redshift is that of
light from distant galaxies which "rec |
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