Textbook ExpertVerified Tutor
5 Dec 2021
Given information
The closest galaxy to
us, the Andromeda Galaxy, 2.5 million light-years away, is
approaching us at a speed of about 
Step-by-step explanation
Step 1.
The expression for shift in the wavelength of spectral line is
As the speed of the galaxy is small as compared to speed of light, the velocity of galaxy is negative as galaxy is approaching us.
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