KAJ R. SVENSSON / SCIENCE PHOTO LIBRARY KAJ R. SVENSSON / SCIENCE PHOTO LIBRARY
Star trails. Time exposure photograph of polar stars during a meteor shower. The circular streaks of light result from the rotation of the Earth in relation to the fixed stars. The diagonal line across the trails is the track of a Perseid meteor. Photographed over the rim of Nicola River canyon, British Columbia, Canada, in August.
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