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The plural form of the word nebula. Nebulae are interstellar clouds of gas and dust that exist outside the solar system. There are two kinds of nebulae: extragalactic nebulae, a huge collection of stars and dust or galaxies, and galactic nebulae, made of interstellar medium or a cloud of dust that exists between stars.
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"Orion's Nebula (M42), January 25, 2009" by astrorom is licensed under CC BY-NC-ND.
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Encyclopædia Britannica Online
N.d. Nebula. http://www.britannica.com/EBchecked/topic/407602/nebula, accessed
December 10, 2014.