comet(redirected from Dirty snowball theory)
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A celestial body, observed only in that part of its orbit that is relatively close to the sun, having a head consisting of a solid nucleus surrounded by a nebulous coma up to 2.4 million kilometers (1.5 million miles) in diameter and an elongated curved vapor tail arising from the coma when sufficiently close to the sun. Comets are thought to consist chiefly of ammonia, methane, carbon dioxide, and water.
[Middle English comete, from Old English comēta, from Late Latin, from Latin comētēs, from Greek komētēs, long-haired (star), comet, from komē, hair.]
com′et·ar′y (-ĭ-tĕr′ē), co·met′ic (kə-mĕt′ĭk) adj.
(Celestial Objects) a celestial body that travels around the sun, usually in a highly elliptical orbit: thought to consist of a solid frozen nucleus part of which vaporizes on approaching the sun to form a gaseous luminous coma and a long luminous tail
[C13: from Old French comète, from Latin comēta, from Greek komētēs long-haired, from komē hair]
ˈcometary, cometic adj
a celestial body (with) a central solid mass and a tail of dust and gas and that orbits the sun along a highly eccentric course.
[1150–1200; Middle English comete < Anglo-French, Old French < Latin comētēs,comēta < Greek komḗtēs wearing long hair]
com′et•ar`y (-ɪˌtɛr i) adj.
A celestial object that orbits the sun along an elongated path. When close to the sun, a comet has a head made up of a gaseous coma surrounding a solid nucleus of ice, frozen gases, and dust. A long, bright stream of gas and dust forms the tail of a comet. See Note at solar system.
comet- Has a tail, and gets its name from Greek kometes, "long-haired star."
See also related terms for tails.
A dust, gas, and ice body that orbits the Sun and develops a long, bright tail on nearing the Sun.
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|Noun||1.||comet - (astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit|
astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole
coma - (astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet; forms as the comet approaches the sun and is warmed
estraterrestrial body, extraterrestrial object - a natural object existing outside the earth and outside the earth's atmosphere
nucleus - (astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail
نـَجْمٌ ذُو ذَنَبنَجْمٌ مُذنَّب
comet[ˈkɒmɪt] N → cometa m
comet[ˈkɒmɪt] n → comète f
n → Komet m
comet[ˈkɒmɪt] n → cometa
a type of heavenly body which leaves a trail of light behind it as it moves. komeet نَجْمٌ مُذنَّب комета cometa kometa der Komet komet κομήτηςcometa komeet شهاب سنگ komeetta comète כּוֹכַב שָׁבִיט धूम्रकेतु komet, repatica üstökös komet halastjarna cometa 彗星 혜성 kometa komēta komet komeetkometkometa لكۍ لرونكى ستورى غوندى خلانداّسمانى جسم چه په لمر را ګرځى cometa cometă комета kométa repatica kometa komet ดาวหาง kuyruklu yıldız 慧星 комета شہابِ ثاقب sao chổi 慧星