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

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Big Bang, Black Holes No Math Holes, No Math ASTR/PHYS 109 Dr. David Toback Lectures 13 & 14 Evidence for the Big Bang Topic 1: The Exploding Universe Big Bang, Black Holes, No Math 1
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Prep for Today (Is now due) – L14 Reading: BBBHNM 11 Reading questions: 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 1 Light and Doppler Shifts 1.Light and Doppler Shifts 2.Gravity and General Relativity 3 Atomic 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 Topic 1: The Exploding Universe Big Bang, Black Holes, No Math 3.Photons and Hydrogen in the Universe
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Where we are going… First give three pieces of evidence D ’t d ’t d t 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 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 W b ll di t t l i t b i 1. We observe all distant galaxies to be moving away from us The further away the galaxy is from us, the f 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 W b l h t ( i ) 2. We observe low energy photons (microwaves) uniformly distributed in all directions which are consistent with being in thermal equilibrium with a temperature 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 N xt L t Next Lecture 3 Photons and Hydrogen in the 3.Photons and Hydrogen in the Universe Topic 1: The Exploding Universe Big Bang, Black Holes, No Math The Lecture After That
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Today’s Outline Looking at Galaxies Light from distant galaxies i R d Shift d d is Red Shifted and appears 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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Galaxies before 1920’s Before the 20’s, when the telescopes became powerful enough, there was no lli id th t compelling evidence that there was anything outside h lk the Milky Way When Einstein first wrote about the Universe , he meant “The Milky Way” Evidence for the Big Bang Topic 1: The Exploding Universe Big Bang, Black Holes, No Math 8 The Milky Way
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Edwin Hubble In the 1920’s Hubble
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