Leonid meteors (bright streaks) during a Leonid meteor shower. Meteors, or shooting stars, are tiny particles of dust that enter the Earth's atmosphere with speeds of up to 100 kilometres per second. Air resistance heats the particles, making them visible as streaks of light. 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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