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Noun
1. molecular cloudAstronomy
Wikipedia definition
2. Molecular cloudA molecular cloud, sometimes called a stellar nursery if star formation is occurring within, is a type of interstellar cloud whose density and size permits the formation of molecules, most commonly molecular hydrogen (H2). Molecular hydrogen is difficult to detect by infrared and radio observations, so the molecule most often used to determine the presence of H2 is CO.
Read “Molecular cloud” on English Wikipedia
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