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An increase in the wavelength of light as a galaxy moves away from earth called a
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An increase in the wavelength of light as a galaxy moves away from earth called a

User Osundblad
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Redshift and blueshift describe how light changes as objects in space (such as stars or galaxies) move closer or farther away from us. The concept is key to charting the universe's expansion.
User Nayan Wadekar
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