When astronomers study the light emitted from the Sun they notice that the light emitted from the east limb (edge) is blueshifted while the light emitted from the west limb is redshifted. The reason for this is that
A) the Sun contains different chemicals that emit different colors.
B) the distance between Earth and the Sun is constantly changing.
C) the Sun is rotating.
D) the two opposing limbs have different surface temperatures.

Question

Quizplus · Accepted Answer

The blueshift and redshift observed are due to the Doppler effect, which occurs because the Sun is rotating. The east limb is moving towards us, causing a blueshift, while the west limb is moving away, causing a redshift.

When Astronomers Study the Light Emitted from the Sun They