The Doppler Shift is a change in frequency due to the Doppler
Effect.
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The change in frequency is caused by the Doppler Effect
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Doppler shift is the change in frequency of a wave that seems to
occur as it moves. Scientists study the doppler shift to see
whether stars are moving away from or toward our galaxy.
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Doppler shift
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The Doppler redshift was discovered by Hippolyte Fizeau in
1848.