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molecular cloud

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molecular cloud
n
(Astronomy) a cool dense interstellar region composed of a wide variety of molecules, mainly hydrogen, plus some dust, in which stars are forming


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Without that mass, the gas at their core does not get hot enough to trigger the nuclear fusion that burns hydrogen - the main component of these molecular clouds - into helium.
A third theory is that is was dropped by a molecular cloud, or dropped by ice-laden cosmic dust.
Traditionally, in a crowded region like this, situated in the plane of our Galaxy and containing many molecular clouds along the line of sight, astronomers have had a difficult time resolving details.
 
 
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