Lecture 27

Lecture 27 - Today (Fri.) in Today (Fri.) in Astro Astro 3...

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Unformatted text preview: Today (Fri.) in Today (Fri.) in Astro Astro 3 3 Cell phones on vibrate The Plan: Today: final lecture - Chapter 17 Cosmology Remember online Quiz 10 due Monday by 11 p.m. Final exam on Tuesday 11:30-2:30 in Broad Art Center 2160E , see map at http://www.ucla.edu/map/map_north.html 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 7.1 The Universe on the Largest Scales No structure larger than 300 Mpc is seen. 17.2 The Expanding Universe o, how long did it take the galaxies to get there? ll galaxies took this time (14 billion years) That is true if observed from any other galaxy too. The Big Bang occurred everywhere: 17.4 Cosmic Dynamics and the Geometry of Space estiny of universe: . It could keep expanding forever, open. . It could collapse , closed. . Continued expansion but speed 0 (flat) ecause of gravity, which way the Universe goes depends on its average density . 1 - ultimate speed 2 3 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 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) 17.4 The Fate of the Cosmos oly %&^#! 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....
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This note was uploaded on 04/16/2008 for the course ASTR 3 taught by Professor Hauser during the Fall '07 term at UCLA.

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Lecture 27 - Today (Fri.) in Today (Fri.) in Astro Astro 3...

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