When will a scientist observe redshift in the spectrum of a distant space object?

(1 point)
when the object is stationary
when the object is in the same frame of reference as the scientist
when the object is moving toward the scientist
when the object is moving away from the scientist

1 answer

A scientist will observe redshift in the spectrum of a distant space object when the object is moving away from the scientist. Redshift occurs due to the Doppler effect, where the wavelengths of light from an object that is receding (moving away) are stretched, causing them to shift toward the red end of the spectrum.

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