Parts of a stable molecular cloud can collapse to form stars if a ____________________ passes through it.
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Q84: The Sun makes most of its energy
Q85: A(n) _ is a cool, dense cloud
Q87: _ appear reddish or pink in colour
Q89: Hydrostatic equilibrium refers to the balance between
Q92: A group of stars that formed together
Q93: Energy flows by radiation or convection inside
Q95: The Orion region contains young main-sequence stars
Q103: Bok globules are small, dark fragments of
Q109: The thermal motions of the atoms in
Q112: Some massive stars only live a few
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