DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
Meteor shower. Computer artwork of trees silhouetted against a meteor shower in the night sky. Meteor tracks, also known as falling or shooting stars, are caused by tiny dust grains entering the Earth's atmosphere. The air resistance incandesces the particles making them visible as streaks of light. Meteor showers occur regularly each year when the Earth crosses the orbit of a comet and its debris enters into the atmosphere.
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