Final answer:
When a star moves away from the Earth, its visible light is shifted towards the red end of the spectrum due to the Doppler effect.
Step-by-step explanation:
When a star is moving away from the Earth, its visible light will be shifted towards the red end of the spectrum. This phenomenon is known as redshift and is caused by the Doppler effect. The Doppler effect occurs when there is a relative motion between the source of light and the observer. As the star moves away from the Earth, the wavelength of its light increases, causing a shift towards the red end of the spectrum.
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