Motion blur

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.[1]

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.

  1. ^ "Star Rain in the Desert". eso.org. European Southern Observatory. Retrieved 26 August 2014.