JERRY LODRIGUSS / SCIENCE PHOTO LIBRARY JERRY LODRIGUSS / SCIENCE PHOTO LIBRARY
Leonid meteor (bright streak) during a Leonid meteor shower. A meteor, or shooting star, is a tiny particle of dust that enters the Earth's atmosphere with a speed of up to 100 kilometres per second. Air resistance heats the particle, making it visible as a streak of light. Another meteor is seen at upper left. The Leonid meteor shower occurs annually, around 17 November, when the Earth crosses the path of debris produced by the Tempel-Tuttle 1886 I comet.
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