INTEGBI C13 Lecture Notes - Lecture 16: Structure Formation, Solar Mass, Outer Space
10 Nov 2016
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Document Summary
The state of the universe when the thermal radiation background radiation was produced. Observed ~0. 001% differences in the thermal background on the sky. Thermal background radiation temperature and density of matter nearly the same everywhere with only tiny 0. 001% differences from place to place. Stars, galaxies, and planet today are all associated with much larger temperature and density differences from place to place. ~380,000 years after the big bang, normal matter was extremely simple: a nearly uniform gas (hydrogen, helium) filling space. Dark matter clumps via its own gravity (even though the universe is expanding) Regions more massive than average stronger gravity pull in more dark matter more massive. Dark matter dominates gravitational runaway on large scales in the universe (there is more dark matter than normal matter in the universe) Regions with more dark matter have stronger gravity. Gravitational runaway in the expanding universe is bottom up. The first galaxies: ~10^4 msun (mostly dark matter)
