Comets main content.

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Comets are kilometer-size snowballs made of ice and dust. Trillions of them live beyond the orbit of Neptune. When a comet enters the inner solar system, sunlight evaporates its icy surface and solar energy blows back bright tails of gas and dust, extending millions of kilometers across interplanetary space.

For Educators

Topic: Astronomy

Subtopic: Planets

Keywords: Astrophysics, Solar system, Comets <