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molecular cloud

noun
1.
a cool dense interstellar region composed of a wide variety of molecules, mainly hydrogen, plus some dust, in which stars are forming
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Contemporary definitions for molecular cloud
noun

a large and dense cloud of cold gas and dust in interstellar space from which new stars are formed

Examples

It is believed that the creation of newborn stars occurs exclusively within molecular clouds.

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