Biology, 12.12.2019 05:31 dymesha17

How can astronomers tell what a distant object's velocity is?
a by measuring the redshift or blueshift of the object
b by looking for particular lines in its spectrum
c by the frequency of the electromagnetic radiation it gives off
d by timing how long it takes light to reach the object and return

it is a

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How can astronomers tell what a distant object's velocity is?
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