Lecture14 - Big Bang, Black ang, Holes No Holes, No Math...

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Big Bang, Black oles No Math Holes, No Math STR/PHYS 109 AS R/PHYS 09 Dr. David Toback Dr. Dav d oback Evidence for the Big Bang Topic 1: The Exploding Universe Big Bang, Black Holes, No Math 1 Lectures 13 & 14
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Prep for Today (Is now due) – L14 Reading: BBHNM 11 BBBHNM 11 Reading questions: hapter 11 Chapter 11 End-of-Chapter Quizzes: Chapter 9 Paper Stuff Paper 1 Revision: CPR due Fri 6PM Paper 2 Submission: Wed 4PM in CPR Evidence for the Big Bang Topic 1: The Exploding Universe Big Bang, Black Holes, No Math 2
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Starting Unit 3 Finished Unit 2: Physics We Need ight and Doppler Shifts 1.Light and Doppler Shifts 2.Gravity and General Relativity tomic Physics and Quantum 3.Atomic Physics and Quantum Mechanics 4.Nuclear Physics and Chemistry 5.Temperature and Thermal Equilibrium Starting Unit 3: Evidence for Big Bang 1.The Exploding Universe 2.Expanding Space-Time Evidence for the Big Bang Topic 1: The Exploding Universe Big Bang, Black Holes, No Math 3 3.Photons and Hydrogen in the Universe
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Where we are going… First give three pieces of evidence Don’t worry… you don’t need to memorize them now Will keep coming back to them over and over again Will be in the lecture notes hen tell the story about how they Then tell the story about how they all fit together Evidence for the Big Bang Topic 1: The Exploding Universe Big Bang, Black Holes, No Math 4
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Overview Three primary pieces of evidence that make us believe the Big Bang model: 1. We observe all distant galaxies to be moving away from us The further away the galaxy is from us, the st r it is m vin fr m us faster it is moving away from us, Both of these things are true no matter which direction we look, and 2. We observe low energy photons (microwaves) uniformly distributed in all directions which are consistent with being in thermal equilibrium with a emperature of about 2 7 degrees above absolute temperature of about 2.7 degrees above absolute zero (Kelvin) 3. Lots of hydrogen and Helium and not much else Evidence for the Big Bang Topic 1: The Exploding Universe Big Bang, Black Holes, No Math 5
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3 Lecture Outline 1.The Exploding Universe Today 2.Expanding Space-Time Next Lecture hotons and Hydrogen in the 3.Photons and Hydrogen in the Universe Evidence for the Big Bang Topic 1: The Exploding Universe Big Bang, Black Holes, No Math 6 The Lecture After That
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Today’s Outline Looking at Galaxies Light from distant galaxies is Red Shifted and appears e same in all directions the same in all directions The Exploding Universe A problem… Evidence for the Big Bang Topic 1: The Exploding Universe Big Bang, Black Holes, No Math 7
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Before the 20’s, when the lescopes became powerful telescopes became powerful enough, there was no compelling evidence that there was anything outside the Milky Way hen Einstein first wrote When Einstein first wrote about the Universe
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This note was uploaded on 01/06/2012 for the course PHYS 109 taught by Professor Davidtoback during the Fall '11 term at Texas A&M.

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Lecture14 - Big Bang, Black ang, Holes No Holes, No Math...

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