What are the very cold (about 20 K), dense clouds of gas thought to be the most massive objects in the Galaxy called?
a) absorption clouds
b) molecular clouds
c) emission nebulae
d) dust clouds
e) reflection nebulae
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Home » Physics » What are the very cold (about 20 K), dense clouds of gas thought to be the most massive objects in the Galaxy called? a) absorption clouds b) molecular clouds c) emission nebulae d) dust clouds e) reflection nebulae