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Redshift: Expansion of Universe
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As the universe expands, it stretches the wavelengths of light along with it, a process called redshift. The farther away an object is, the more the light from it has stretched by the time it reaches us.
Credit: NASA/JPL-Caltech//R. Hurt (Caltech-IPAC)
Credit: NASA/JPL-Caltech//R. Hurt (Caltech-IPAC)
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