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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 Browser: a Personal AI Assistant
    Comet browser by Perplexity is the AI browser that acts as a personal assistant Automate tasks, research the web, organize your email, and more with Comet
  • Comet - Wikipedia
    These phenomena are due to the effects of solar radiation and the outstreaming solar wind plasma acting upon the nucleus of the comet Comet nuclei range from a few hundred meters to tens of kilometers across and are composed of loose collections of ice, dust, and small rocky particles
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  • Comets - Science@NASA
    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 miles
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    Stay tuned for the latest comet updates! While we’re waiting for a bright comet to appear, let’s brush up on some astronomy basics in an easy, visual way Learn how comets differ from meteors and asteroids with our All You Need to Know About Comets infographic
  • Comet | Definition, Composition, Facts | Britannica
    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
  • Interstellar comet may be oldest object ever seen in solar system
    An interstellar comet that blazed past the sun and swung by Earth last year could be nearly three times older than our solar system and is unlike anything ever before seen in our cosmic backyard
  • Comet C 2025 R3 (PanSTARRS): Current Visibility, Magnitude Best Dates
    Follow the latest updates on Comet C 2025 R3 (PanSTARRS) — including new images, brightness estimates, and visibility updates as the comet continues its journey
  • NASA’s Webb Finds Clues to Ancient, Distant Origin of Comet 3I ATLAS
    As interstellar comet 3I ATLAS began moving away from the Sun in December 2025, astronomers took the opportunity to turn NASA’s powerful James Webb Space Telescope in its direction and capture detailed measurements of its chemical components
  • Halleys Comet - Wikipedia
    Halley was the first comet to be recognised as periodic Until the Renaissance, the philosophical consensus on the nature of comets, promoted by Aristotle, was that there were disturbances in Earth's atmosphere This idea was disproven in 1577 by Tycho Brahe, who used parallax measurements to show that comets must lie beyond the Moon Many were still unconvinced that comets orbited the Sun





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