Redshift is a phenomenon in which the wavelength of light is stretched, or shifted towards the red end of the spectrum.
This can be caused by a number of factors, including the Doppler effect and the expansion of the universe.
The Doppler effect is a change in the frequency of a wave in relation to an observer who is moving relative to the wave source.
When a source of sound is moving away from an observer, the sound waves are stretched out, resulting in a lower pitch.
This is known as the Doppler shift.
The same principle applies to light waves.
When a source of light is moving away from an observer, the light waves are stretched out, resulting in a redshift.
The expansion of the universe is another cause of redshift. As the universe expands, the space between galaxies is stretched.
This stretching also stretches the light waves traveling between galaxies, resulting in a redshift.
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