Chapter14 - Evolution of the Universe Topic 2: After The...

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Unformatted text preview: Evolution of the Universe Topic 2: After The First Three Minutes Big Bang, Black Holes, No Math 1 Big Bang, Black Holes, No Math ASTR/PHYS 109 Dr. David Toback Lectures 18 & 19 Evolution of the Universe Topic 2: After The First Three Minutes Big Bang, Black Holes, No Math 2 Prep for Today (Is now due) L19 Reading: BBBHNM 15 Reading questions: Chapter 15 End-of-Chapter Quizzes: Chapter 13 Paper Stuff Paper 1: Misgraded? Let us know Paper 2: Misgraded? Let us know. Revisions due Monday Paper 3: Due Today, CPR due next Wednesday Evolution of the Universe Topic 2: After The First Three Minutes Big Bang, Black Holes, No Math Paper 3 & Paper 2 Revisions Paper 3: What is the evidence for the Big Bang? Make sure to read all the instructions in CPR CPR due 1 week from today (Wednesday) If you want TA feedback for calibrations, let us know ASAP Same format at Paper 2 Paper 2 Revision: Due Monday before class 3 Evolution of the Universe Topic 2: After The First Three Minutes Big Bang, Black Holes, No Math 4 A Big Bang Occurs Then What? Universe goes through a phase of being hot and small, with lots of high energy particles Then the Universe gets bigger and cooler As it gets bigger, it evolves Evolution of the Universe Topic 2: After The First Three Minutes Big Bang, Black Holes, No Math 5 The History of the Universe Universe expands as time passes Universe cools down as time passes 1 second! 10 billion years! 10 billion degrees! 1 degree Kelvin! Analogy: As a balloon gets bigger its temperature drops Evolution of the Universe Topic 2: After The First Three Minutes Big Bang, Black Holes, No Math 6 Various Times Explain what happens during each of a number of different periods in time The VERY early universe The first three Minutes The next 300,000 years The next billion years ~15 billion years later (now) The ultimate fate of the universe? The first four will take a couple of lectures } Chap 14 } Chaps 15-17 } Unit 6 } Chap 13 Evolution of the Universe Topic 2: After The First Three Minutes Big Bang, Black Holes, No Math 7 Where are we now in the history? 3 Minutes Evolution of the Universe Topic 2: After The First Three Minutes Big Bang, Black Holes, No Math 8 After the First Three Minutes At about the 3 minute mark the temperature of the Universe is about 1 billion degrees Electrons and positrons have mostly annihilated each other, cant produce new ones ~1 electron for every proton Evolution of the Universe Topic 2: After The First Three Minutes Big Bang, Black Holes, No Math 9 What else? The temperature drops so that the photons, on average, cant even break up deuterium Easier to start building up the heavier nuclei!...
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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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Chapter14 - Evolution of the Universe Topic 2: After The...

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