The andromeda galaxy, unlike most other galaxies, has a. red shift. c. blue shift. b. green shift. d. no observable shift.

blue shift.

Explanation:

Red-shift and blue shifts result from Doppler effect of light. When there is relative motion between two bodies, the light received from the source seems to have higher frequency (blue-shift) if it approaches the observer and appears to have lower frequency (red-shift) if it recedes away.

Universe is expanding. So, the light received from most of the galaxies is red-shifted. Andromeda galaxy is approaching towards the Earth. Thus, the light from the Andromeda is blue-shifted.

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