motion blur
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motion blur (Wikipedia)
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Earth's rotation causes motion blur in long-exposure photos of the night sky. This diurnal motion leaves star trails in exposures like this one taken at La Silla Observatory.
Motion blur is the apparent streaking of moving objects in a photograph or a sequence of frames, such as a film or animation. It results when the image being recorded changes during the recording of a single exposure, due to rapid movement or long exposure.
