BABAK TAFRESHI / SCIENCE PHOTO LIBRARY BABAK TAFRESHI / SCIENCE PHOTO LIBRARY
Star trails over a desert. Time-exposure image of stars passing over a cactus in the Atacama Desert, Chile. Star trails are formed by the apparent motion of the stars in the sky as the Earth rotates on its axis. Here, in the southern hemisphere, the concentric star trails form around the South Celestial Pole.
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