10.22.07 Astronomy notes

10.22.07 Astronomy notes - Fragmentation when two bodies...

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10.22.2007 – Astronomy Nebular Theory: large cloud of gas in space (there are lots of these in universe), tend to be spinning slowly in one direction. If the cloud is disturbed, it will collapse (doesn’t take much, they are not very stable). As they collapse, angular momentum is conserved and it rotates fasters. Condensation Theory: builds on nebular theory. Terrestrial Planet Formation Dust - Cooling. It emits in the infrared. Usually made of carbon, about a micron across. Dust absorbs radiation at all wavelengths. Absorbs all, emits only infrared, therefore cools overall. - Accretion Platforms Accretion = sticking together. Once things stick together enough, we get Planetesimals (anything from dust up to small planet)
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Unformatted text preview: Fragmentation: when two bodies run into each other and shatter apart (rather than sticking together). Typically two bodies of the same size. You get lots of debris going in all directions. Meteoric Bombardment Jovian Planet Formation-Runaway Accretion • Pulling in nebular gas • Forms mini-nebular system forms moons (naturally forming. The big ones)-Inward Migration Role of Heat Hotter more vigorous interactions-Inner Regions • Heated by protosun • Heat destroys a lot of dust cooling slowed, fewer accretion platforms-Outer Regions • Cooling continues Jovian planets and comets Mostly hydrogen and helium (runaway accretion), also lots of water, ammonia, methane Comet ejections:...
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