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Intergalactic dust
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Intergalactic dust : ウィキペディア英語版
Intergalactic dust
Intergalactic dust is cosmic dust in between galaxies in intergalactic space.〔(M. E. Bailey, David Arnold Williams - Dust in the universe: the proceedings of a conference at the Department of Astronomy, University of Manchester, 14-18 December 1987 - Page 509 (Google Books accessed 2010) )〕 Evidence for intergalactic dust has been suggested as early as 1949, and study of it grew throughout the late 20th century.〔 There are large variations in the distribution of intergalactic dust.〔 The dust may affect intergalactic distance measurements, such as to supernova and quasars in other galaxies.〔(Nancy Atkinson - Intergalactic Dust Could Be Messing Up Observations, Calculations (February 26, 2009) - Universe Today )〕
Intergalactic dust can be a part of intergalactic dust clouds, shown to exist around some other galaxies since the 1960s.〔 By the 1980s, at least four intergalactic dust clouds were discovered within several megaparsec (Mpc) of the Milky Way galaxy,〔 and an example of this is the Okroy cloud.〔
In February 2014, NASA announced a greatly upgraded database for tracking polycyclic aromatic hydrocarbons (PAHs) in the universe. According to scientists, more than 20% of the carbon in the universe may be associated with PAHs, possible starting materials for the formation of life. PAHs seem to have been formed as early as two billion years after the big bang, are widespread throughout the universe, and are associated with new stars and exoplanets.
==See also==

* Astrochemistry
* Atomic and molecular astrophysics
* Cosmochemistry
* Extragalactic astronomy
* Extraterrestrial materials
* Hypervelocity star
* Intergalactic space
* Intergalactic medium
* Warm–hot intergalactic medium
* Intergalactic star
* Interstellar medium
* List of interstellar and circumstellar molecules

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Intergalactic dust」の詳細全文を読む



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