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comet    音标拼音: [k'ɑmət]
n. 慧星

慧星

comet
n 1: (astronomy) a relatively small extraterrestrial body
consisting of a frozen mass that travels around the sun in
a highly elliptical orbit

Comet \Com"et\, n. [L. cometes, cometa, from Gr. ? comet, prop.
long-haired, fr. ? to wear long hair, fr. ? hair, akin to L.
coma: cf. F. com[`e]te.] (Astron.)
A member of the solar system which usually moves in an
elongated orbit, approaching very near to the sun in its
perihelion, and receding to a very great distance from it at
its aphelion. A comet commonly consists of three parts: the
nucleus, the envelope, or coma, and the tail; but one or more
of these parts is frequently wanting. See Illustration in
Appendix.
[1913 Webster]

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  • Comet - 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
  • Comets - Science@NASA
    Comets are cosmic snowballs of frozen gases, rock, and dust that orbit the Sun When frozen, they are the size of a small town When a comet's orbit brings it close to the Sun, it heats up and spews dust and gases into a giant glowing head larger than most planets The dust and gases form a tail that stretches away from the Sun for millions of
  • Comet | Definition, Composition, Facts | Britannica
    comet, a small body orbiting the Sun with a substantial fraction of its composition made up of volatile ices When a comet comes close to the Sun, the ices sublimate (go directly from the solid to the gas phase) and form, along with entrained dust particles, a bright outflowing atmosphere around the comet nucleus known as a coma
  • What Is a Comet? | NASA Space Place – NASA Science for Kids
    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
  • Comets: Everything you need to know | Space
    Comets are icy leftovers from the formation of the solar system Explore these 'dirty snowballs' in more detail with our ultimate comet guide
  • What Are Comets | What Does a Comet Look Like - Star Walk
    A comet is a space object of ice and dust that orbits the Sun When a comet is in the inner Solar System, it can be seen in the sky as a blurry spot with a tail What are comets made of?
  • Comet: Definition, Tails, Facts, Orbit, Visibility, Difference
    Comet appearance varies from a bright fuzzy ball with a tail to a faint diffuse patch in the sky Distinctive comas and tails stretching millions of kilometers characterize many visible comets Comet visibility periods range from weeks to months depending on their orbits and activity levels
  • Comets explained: An essential guide to the snow cones of space
    As a comet moves close to the Sun, it heats up The various frozen gases and molecules making up the comet change directly from solid ice to gas in a process called sublimation This
  • Comet Facts ☄ - Interesting Facts about Comets - Space Facts
    A comet is a very small solar system body made mostly of ices mixed with smaller amounts of dust and rock Most comets are no larger than a few kilometres across The main body of the comet is called the nucleus, and it can contain water, methane, nitrogen and other ices
  • Comets are icy balls of gas, dust and rock - EarthSky
    In fact, they develop giant glowing heads – called a comet’s coma – that may be larger than most planets And indeed, they sprout their long comet tails that stretch millions of miles long





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