BABAK TAFRESHI / SCIENCE PHOTO LIBRARY BABAK TAFRESHI / SCIENCE PHOTO LIBRARY
South celestial pole star trails. Time-exposure image of stars passing around the south celestial pole. 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. The bright mark (left) point in this image is caused by the star Canopus.
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