Chapter17 - Big Objects and Black Holes Topic 3: Properties...

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Unformatted text preview: Big Objects and Black Holes Topic 3: Properties of Black Holes Big Bang, Black Holes, No Math 1 Big Bang, Black Holes, No Math ASTR/PHYS 109 Dr. David Toback Lectures 22 & 23 Big Objects and Black Holes Topic 3: Properties of Black Holes Big Bang, Black Holes, No Math 2 Prep for Today (Is now due) L23 Reading: BBBHNM 18 Reading questions: Chapter 18 End-of-Chapter Quizzes: Chapter 16 Paper Stuff Paper 2: Misgraded? Let us know Paper 3: Misgraded? Let us know. Revision due Monday before class. Want feedback? Due Friday for quick response Paper 4: Will be assigned when we start Chapter 17 Big Objects and Black Holes Topic 3: Properties of Black Holes Big Bang, Black Holes, No Math Announcemen t before we begin 3 Big Objects and Black Holes Topic 3: Properties of Black Holes Big Bang, Black Holes, No Math 4 Unit 5: Big Objects 1. Galaxy Formation 2. Star Birth and Death 3. More on Black Holes Today Big Objects and Black Holes Topic 3: Properties of Black Holes Big Bang, Black Holes, No Math 5 Where are we now in the history? A billion years after the bang stars start forming Big Objects and Black Holes Topic 3: Properties of Black Holes Big Bang, Black Holes, No Math 6 Outline What makes Black Holes black What a black hole would look like to a nearby observer Evidence for Black Holes Different types of Black Holes A few words on why black holes are so important in cosmology and our understanding of the Big Bang Big Objects and Black Holes Topic 3: Properties of Black Holes Big Bang, Black Holes, No Math 7 Moving Towards Black Holes If the neutron star has a critical mass (about 3M Sun ) it can continue to collapse Nothing strong enough to oppose the crush of gravity! Continues to collapse until it becomes a single point in space Call this a Black Hole Big Objects and Black Holes Topic 3: Properties of Black Holes Big Bang, Black Holes, No Math 8 Why do we call it a black hole? Call it a Black Hole because light cant escape Say more about what this means Big Objects and Black Holes Topic 3: Properties of Black Holes Big Bang, Black Holes, No Math 9 The Sun in Space-Time The size of the Sun Big Objects and Black Holes Topic 3: Properties of Black Holes Big Bang, Black Holes, No Math 10 Compressing the Sun What if we compressed the Sun into a Neutron Star? Far outside the Sun you cant really tell the difference You can tell the difference if you are very close to the Sun itself The sun is now a few kilometers across Big Objects and Black Holes Topic 3: Properties of Black Holes Big Bang, Black Holes, No Math 11 Compress the Sun into a Black Hole Again, far outside the Sun you cant really tell the difference, but you can very close to the Sun itself Infinite curvature Big Objects and Black Holes Topic 3: Properties of Black Holes Big Bang, Black Holes, No Math What does this have to do with light being able to escape?...
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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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Chapter17 - Big Objects and Black Holes Topic 3: Properties...

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