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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.
Comet is THE destination on free TV for true fans of sci-fi and fantasy. We relish everything out-of-this-world and the fans who love it, with some of the most iconic franchises including The X-Files, Stargate SG-1, Buffy The Vampire Slayer, and Grimm, plus fun movie titles that celebrate your sci-fi and fantasy fandom.
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.
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.
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.
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.
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.
Jul 15, 2014 · Just what is a comet, exactly? Comets, the solar system's dirty snowballs, are suspected to be one of the remnants of planet formation.
Jun 7, 2000 · What Are Comets? * Comets are small, fragile, irregularly shaped bodies composed of a mixture of grains and frozen gases. They have highly elliptical orbits that repeatedly bring them very close to the Sun and then swing them deeply into space, often beyond the orbit of Pluto.
Sep 25, 2019 · Comet Facts Comets are snowballs made up of frozen gas, rock, and dust that orbit the Sun. As they get closer to the Sun, they heat up and leave a trail of glowing dust and gases.
