Galactic_recycling - Atomic hydrogen gas form as hot gas...

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Galactic recycling Supernova remnant cools and begins to emit visible light as it expands SN remnants are a galaxy’s “particle accelerators,” accelerating charged particles to near light speed Radio emission from spiraling Cosmic rays from SN Cosmic rays – high energy (fast moving) particles from space Mostly protons + electrons Can see then inside a cloud chamber Galactic fountains Multiple SN create huge hot bubbles that can blow out of disk Gas clouds cooling in the halo can rain back down on disk
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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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Galactic_recycling - Atomic hydrogen gas form as hot gas...

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