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Unformatted text preview: Atomic hydrogen gas form as hot gas cools, allowing electrons to join with protons. Molecular clouds from next, after gas cools enough to allow to combine into molecules Molecular clouds in Orion Composition: -mostly H2-about 28% He-abt. 1% CO-many other molecules Stars make new elements by fusion Dying stars expel gas and new elements, producing hot bubbles Hot gas cools, allowing atomic hydrogen clouds to form...
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