We cannot use Hubble's law to measure the distances to nearby galaxies, because their random motions are
Question:
(a) What is the shift in wavelength of the 656-nm line of hydrogen emitted from the Andromeda Galaxy, as seen by us?
(b) Is this a redshift or a blueshift?
(c) Ignoring the expansion, how soon will it and the Milky Way Galaxy collide?
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a Because the speed of the galaxy is small compared t...View the full answer
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