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when a luminous source is relatively moving away, the light emitted from the source is almost stretched (the frequency of the waves decrease). In other words, enough redshift will cause violet light to become red due to a decrease in frequency. Light which is already red will turn to infra-red, microwaves, and radio waves. If the redshift is very very very high (this does not usually happen in the universe), even x-rays and gamma-rays can be red shifted to radio waves.

Similarly, when the source is moving relatively closer, the light emitted will be blue shifted: the frequency will increase.

This is called the Doppler shift or the Doppler effect.

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red shift?

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