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Star Trails |
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| This long-exposure photograph shows the Delicate Arch, a rock formation in Utah, silhouetted against the trails of stars in the sky. The brightest and innermost trail, seen through the center of the arch, tracks the North Star. The North Star is the star located closest to the north celestial pole of the Earth’s axis. It appears to rotate very little while the other stars move around it. This apparent motion is actually caused by the rotation of Earth. | ||||||
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| David Nunuk/Photo Researchers, Inc. | ||||||
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| Appears in these articles: | ||||||
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| Astronomy; Star (astronomy); Precession; North Star | ||||||
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