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Lecture 27 - Today(Fri in Astro 3 Cell phones on vibrate...

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Today (Fri.) in Today (Fri.) in Astro Astro 3 3 z Cell phones on vibrate… z The Plan: Í Today: final lecture - Chapter 17 “Cosmology” Í Remember online Quiz 10 due Monday by 11 p.m. Í Final exam on Tuesday 11:30-2:30 in Broad Art Center 2160E , see map at http://www.ucla.edu/map/map_north.html
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Units of Chapter 17 9 The Universe on the Largest Scales 9 The Expanding Universe 9 Cosmic Dynamics and the Geometry of Space 9 The Fate of the Cosmos 9 The Early Universe The Formation of Nuclei and Atoms Cosmic Inflation The Formation of Large-Scale Structure in the Universe
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17.1 The Universe on the Largest Scales No structure larger than 300 Mpc is seen.
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17.2 The Expanding Universe So, how long did it take the galaxies to get there? All galaxies took this time (14 billion years) That is true if observed from any other galaxy too. The Big Bang occurred everywhere:
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17.4 Cosmic Dynamics and the Geometry of Space Destiny of universe: 1. It could keep expanding forever, “open”. 2. It could collapse , “closed”. 3. Continued expansion but speed Æ 0 (flat) Because of gravity, which way the Universe goes depends on its average density . 1 - ultimate speed 2 3
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17.4 Cosmic Dynamics and the Geometry of Space The closed geometry is like the surface of a sphere The flat one is flat The open geometry is like a saddle . Oof…
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17.4 The Fate of the Cosmos However, from looking at distant Type 1 supernovae, we see not a decelerating universe, but an accelerating one Scientific “shock and awe!!!!!!!!!” (From brightness)
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17.4 The Fate of the Cosmos Holy %&^#! Right now the furthest galaxies are accelerating away. Some day, near galaxies will accelerate away. Then parts of our Milky Way galaxy will accelerate away. Then nearest stars. Then the planets in our Solar System. Then the Earth and solids/liquids. Then the atoms themselves fall apart.
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