BABAK TAFRESHI / SCIENCE PHOTO LIBRARY BABAK TAFRESHI / SCIENCE PHOTO LIBRARY
Star trails over rock carvings. Time-exposure image of stars passing over circa 6,000-year-old petroglyphs engraved in a rock-face in the Teimareh valley, Zagros Mountains, central Iran. Star trails are formed by the apparent motion of the stars in the sky as the Earth rotates on its axis. Here, in the northern hemisphere, the concentric star trails form around the North Celestial Pole.
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