Cosmology - o You are always facing stars, so the night sky...

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Cosmology Material from quasars coming from the vicinity of the black hole, nothing coming out of the blackhole o radio galaxies also have jets of material that shoot out Stars moving very quickly are evidence that supermassive BH’s are the cause of quasars o stars can only move very fast when acted upon by gravity From the distance and from the speed of stars you can tell the mass of the object it is orbiting A big BH in Milky Way o blocked at optical wavelengths by “galactic dust” Olbers’ Paradox –why is the sky dark at night?
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Unformatted text preview: o You are always facing stars, so the night sky should be lit up o Surface brightness of Stars It is constant – independent of distance The brightness per unit area stays the same, while the total brightness diminishes with distance o Answer: Universe has a finite age light from the most distant stars has not reached us yet The universe is so young that the typical line of sight misses a star The primary light in the universe is from the radiation left over from the cosmic background radiation...
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This note was uploaded on 04/04/2008 for the course ASTRO C 10 taught by Professor Filippenko during the Fall '08 term at Berkeley.

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