Star trails

Credit: KAJ R. SVENSSON/SCIENCE PHOTO LIBRARY

Caption: Star trails. Time-exposure image of star trails over trees. Star trails are formed by the apparent motion of the stars around the celestial pole as the Earth rotates. The differing colours of the trails are due to the different intrinsic colours of the stars themselves. Photographed over British Columbia, Canada.

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Keywords: astronomy, astrophysics, british columbia, canada, canadian, celestial, cosmology, night, science, star trails, stars, stellar, time-exposure, trail, tree, trees, vancouver island, vertical

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