BABAK TAFRESHI / SCIENCE PHOTO LIBRARY BABAK TAFRESHI / SCIENCE PHOTO LIBRARY
Star trails over Damavand volcano. Time-exposure image of stars moving around the celestial north pole, marked by the Polaris (the Pole Star) above Mount Damavand, Iran. Star trails are formed by the apparent motion of the stars in the sky as the Earth rotates on its axis. Mount Damavand, in the Alborz mountain range, is the highest peak in Iran.
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