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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
  • 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
  • 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
  • Comet Chasing
    Comet Chasing provides up-to-date information on how to observe the brightest comets visible this month, including finder charts and observing tips
  • What is a comet? - BBC Sky at Night Magazine
    Simply put, a comet is a large body of ice and dust orbiting the Sun, sometimes seen as a bright object in the sky with a long tail streaming behind it Wanderers of the Solar System, comets can rank among the most spectacular of astronomical sights when they appear in our skies
  • What Is a Comet? | NASA Space Place – NASA Science for Kids
    What Is a Comet? The Short Answer: Comets are large objects made of dust and ice that orbit the Sun Best known for their long, streaming tails, these ancient objects are leftovers from the formation of the solar system 4 6 billion years ago
  • 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
  • Comet - Origins, Formation, Discovery | Britannica
    Comet - Origins, Formation, Discovery: The Greek philosopher Aristotle thought that comets were dry exhalations of Earth that caught fire high in the atmosphere or similar exhalations of the planets and stars
  • Comet Facts - Science@NASA
    Each comet has a frozen part, called a nucleus, often a few miles across The nucleus contains icy chunks, frozen gases with bits of embedded dust 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





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