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BUY THIS ANIMATION of an REDSHIFT STAR DOPPLER EFFECT!
Doppler Effect: this UHD 4K animation shows how the apparent increase in frequency observed in light waves emitted from an approaching star (or conversely a decrease in frequency in light waves emitted from a receding star) happens. This causes a red shift for an observer watching the star recede (left of animation) and a blue shift for an observer watching the star approach (right of animation).