BABAK TAFRESHI / SCIENCE PHOTO LIBRARY BABAK TAFRESHI / SCIENCE PHOTO LIBRARY
Star trails and meteor over silhouetted trees. Time-exposure image of a meteor (lower left) and star trails in the night sky. 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 star trails form concentric circles around the north celestial pole.
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