FRANK ZULLO / SCIENCE PHOTO LIBRARY FRANK ZULLO / SCIENCE PHOTO LIBRARY
Meteor track. The bright white streak in the lower left of this photograph of the Milky Way is a meteor track, caught by long exposure during the annual Geminid meteor shower. The Milky Way - our own galaxy - appears as a faint blue band running from lower centre to upper left. In the lower right is Sirius, the brightest star visible from Earth. The constellation Orion appears at centre right. Meteor showers occur at the same time each year, when the Earth crosses the orbit of a comet and collides with its debris. The tiny particles of debris ignite as they enter Earth's atmosphere at high speed, producing streaks of light. Photographed in Arizona, USA.
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