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Perseid meteor over Yosemite. Time-lapse image of a Perseid meteor (streak of light) burning up in the Earth's atmosphere, seen above Yosemite National Park in California, USA. Meteor showers occur regularly each year when the Earth crosses the orbit of cometary debris. The Perseid shower is associated with the Swift-Tuttle comet, reaching its peak around 12 August each year. The Half Dome and El Capitan peaks are in the foreground, with the Pleiades (the Seven Sisters, next to meteor) and the California Nebula (red, upper left), visible in the night sky. Photographed on 12 August 2016. (KEYSTONE/SCIENCE PHOTO LIBRARY/BABAK TAFRESHI/SCIENCE PHOTO LIBRARY)