A dense cloud containing 
H2,
He, and many other molecules. Molecular clouds are typically 100-
, 10-20 K, size of 
pc, and have 10-106 molecules cm-3. The free-fall time for such clouds is 
y. However, magnetic fields support the cloud and support the collapse, regulating star formation. Molecular clouds with masses in the range 103- are sometimes called giant molecular clouds.
H2, He, and many other molecules. Molecular clouds are typically 100- , 10-20 K, size of pc, and have 10-106 molecules cm-3. The free-fall time for such clouds is y. However, magnetic fields support the cloud and support the collapse, regulating star formation. Molecular clouds with masses in the range 103- are sometimes called giant molecular clouds.
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