FRANK ZULLO / SCIENCE PHOTO LIBRARY FRANK ZULLO / SCIENCE PHOTO LIBRARY
Perseid meteor track. Time-exposure image over trees of a perseid meteor track (at left) among many star trails. Meteors originate as tiny interplanetary dust grains travelling between 35 and 95 km/s. As a meteor falls to Earth it burns up. The meteor's path can be seen as a streak of light known as a shooting star. Perseids appear in great numbers around the 12th of August when the Earth crosses a band of dust called the meteor stream. They are called 'perseids' because they mainly appear in the constellation of Perseus. Star trails are made by the movement of the stars through the sky as the Earth rotates. Photographed over Tucson Mountain Park, Arizona.
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