BABAK TAFRESHI / SCIENCE PHOTO LIBRARY BABAK TAFRESHI / SCIENCE PHOTO LIBRARY
Timelapse showing the rotation of the stars in the night sky over lake Mono in California. At upper right is the North Star (Polaris), which marks the location of the north celestial pole. As the Earth spins on its axis the north celestial pole remains fixed. The stars seen from the Northern Hemisphere appear to rotate around it, moving across the sky from East to West.
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