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Created page with "== Introduction == The Relativistic Doppler Effect is a change in frequency (and wavelength) of light, caused by the relative motion of the source and the observer (detector), when taking into account Einstein's theory of relativity. This effect is a key result of special relativity and is different from the classical Doppler effect, which does not incorporate the effects of time dilation or length contraction, both of which are predictions of special relativity...."
