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  1. en.wikipedia.org › wiki › CometComet - Wikipedia

    A comet is an icy, small Solar System body that warms and begins to release gases when passing close to the Sun, a process called outgassing. This produces an extended, gravitationally unbound atmosphere or coma surrounding the nucleus, and sometimes a tail of gas and dust gas blown out from the coma.

  2. science.nasa.gov › solar-system › cometsComets - NASA Science

    Comets are frozen leftovers from the formation of the solar system composed of dust, rock, and ices. They range from a few miles to tens of miles wide, but as they orbit closer to the Sun, they heat up and spew gases and dust into a glowing head that can be larger than a planet.

  3. May 21, 2024 · By the end of this summer, we may have a good idea as to whether we'll have a bright naked-eye comet gracing our early autumn evening sky, known as C/2023 A3 (Tsuchinshan–ATLAS).

  4. May 25, 2024 · Comet, a small body orbiting the Sun with a substantial fraction of its composition made up of volatile ices. Comets are among the most-spectacular objects in the sky, with their bright glowing comae and their long tails.

  5. Jul 31, 2023 · Comets are icy leftovers from the formation of the solar system. Explore these 'dirty snowballs' in more detail with our ultimate comet guide.

  6. Jun 13, 2024 · A comet has two tails that get longer the closer it gets to the Sun. Both tails are always directed away from the Sun. The ion tail (blue) always points directly away from the Sun, while the dust tail (yellow) points away from the Sun in a slightly different direction than the ion tail.

  7. A comet warms up as it nears the Sun and develops an atmosphere, or coma. The Sun's heat causes the comet's ices to change to gases so the coma gets larger. The coma may extend hundreds of thousands of kilometers.

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