Question

when will a scientist observe redshift in the spectrum of a distant space object? (1 point)
when the object is in the same frame of reference as the scientist
when the object is stationary
when the object is moving away from the scientist
when the object is moving toward the scientist

Explanation:

Redshift occurs due to the Doppler effect in cosmology. When a space object moves away from an observer (the scientist), the light waves it emits get stretched, causing a shift towards the red end of the spectrum. If the object is in the same frame of reference, stationary, or moving toward the scientist, redshift does not occur (blueshift occurs when moving toward).

Answer:

C. when the object is moving away from the scientist