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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15 January, 08:01

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Ernest Mckay · Answer 1

A.) By measuring the redshift or blueshift, which is actually nothing but spectral lines on electronmagnetic spectrum of that