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nebula    音标拼音: [n'ɛbjələ]
n. 星云,云翳

星云,云翳

nebula
n 1: a medicinal liquid preparation intended for use in an
atomizer
2: cloudiness of the urine
3: an immense cloud of gas (mainly hydrogen) and dust in
interstellar space
4: (pathology) a faint cloudy spot on the cornea

Nebula \Neb"u*la\ (n[e^]b"[-u]*l[.a]), n.; pl. {Nebulae}
(n[e^]b"[-u]*l[=e]). [L., mist, cloud; akin to Gr. nefe`lh,
ne`fos, cloud, mist, G. nebel mist, OHG. nebul, D. nevel,
Skr. nabhas cloud, mist. Cf. {Nebule}.]
1. (Astron.) A faint, cloudlike, self-luminous mass of matter
situated beyond the solar system among the stars. The term
was originally applied to any diffuse luminous region.
Now, technically, it is applied to interstellar clouds of
dust and gases ({diffuse nebula}). However distant
galaxies and very distant star clusters often appear like
them in the telescope, such as the {spiral nebula} in
Andromeda, known now to be a distant galaxy.
[1913 Webster PJC]

2. (Med.)
(a) A white spot or a slight opacity of the cornea.
(b) A cloudy appearance in the urine. [Obs.]
[1913 Webster]

19 Moby Thesaurus words for "nebula":
Black Magellanic Cloud, Crab Nebula, Gegenschein,
bright diffuse nebula, coalsack, counterglow, dark cloud,
dark nebula, diffuse nebula, dust cloud, gaseous nebula,
nebula of Lyra, nebular hypothesis, nebulosity, nebulous stars,
planetary nebula, ring nebula, the Coalsack, zodiacal light


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  • The Web Nebulae
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  • Astronomy Questions from Nine Planets
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    Type: emission nebula Distance: 1500 ly aka “The Great Nebula in Orion” The Orion Nebula is easily visible with the naked eye as the middle star in Orion’s “sword” In this image M 42 (NGC 1976) and M 43 (NGC 1982) appear as one large object The blue region on the right consists of the reflection nebulae NGC 1973, 1975 and 1977
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    Nebulas' size ranges from millions of miles to hundreds of light-years in diameter Keep reading for more interesting facts perfect for kids
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    This lost mass is engulfing the star, forming a sort of nebula about 250 times bigger than Betelgeuse Some parts of the mass have been blown off into space by powerful solar winds, and reach up to more than 30 000 AU away from Betelgeuse Because of its mass, it is believed that Betelgeuse has an overall density smaller than air
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    Mintaka is a multiple star system located in the constellation of Orion It is also one of the three main stars that form Orion’s Belt It is the seventh brightest star in Orion and the 73 rd brightest star in the night sky
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    This allows you to see the moon, the planets, nebula, stars, and deep-sky objects Without controversy, whatever your target is, this eyepiece helps you get a detail-oriented view The field of view of this eyepiece is designed to add visual effects to your view, making it an excellent addition for both amateurs and beginners
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    Fomalhaut is located in a pretty dark region, but other deep sky objects such as the Helix Nebula are relatively close to it The constellation of Piscis Austrinus was once known as Piscis Notius – representing the Southern Fish The Future Fomalhaut A is around 440 million years old, much younger than our Sun





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