What explains the observed redshift of light from other galaxies in space?
Answer options with 4 options
A.
Galaxies are revolving around one another.
B.
Galaxies are expanding away from one another.
C.
Distant galaxies have a larger mass than closer galaxies.
D.
Distant galaxies produce fewer stars than closer galaxies.
1 answer
The correct answer is:
B. Galaxies are expanding away from one another.
This phenomenon is known as the redshift and is primarily due to the Doppler effect, which occurs as galaxies move away from us because of the expansion of the universe. The greater the distance, the faster they appear to be moving away, resulting in a redshift of the light they emit.
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