As the galaxies move away from our galaxy a shift on the electromagnetic spectrum is observed this phenomenon is called
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Redshift and blueshift describe how light shifts toward shorter or longer wavelengths as objects in space (such as stars or galaxies) move closer or farther away from us.
Explanation:
In the widely accepted cosmological model based on general relativity, redshift is mainly a result of the expansion of space: this means that the farther away a galaxy is from us, the more the space has expanded in the time since the light left that galaxy, so the more the light has been stretched, the more redshifted.
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if moving away redshift and if moving towards the blue shift
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