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Lecture23 - Big Bang Black Holes No Math No ASTR/PHYS 109...

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Big Bang, Black Holes No Math Holes, No Math ASTR/PHYS 109 Dr David Toback Dr. David Toback Lectures 22 & 23 Big Objects and Black Holes Topic 3: Properties of Black Holes Big Bang, Black Holes, No Math 1
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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 Big Bang, Black Holes, No Math Paper 4: Will be assigned when we start Chapter 17
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Announcement before we begin Big Objects and Black Holes Topic 3: Properties of Black Holes Big Bang, Black Holes, No Math 3
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Unit 5: Big Objects 1.Galaxy Formation 2.Star Birth and Death 3.More on Black Today Holes Big Objects and Black Holes Topic 3: Properties of Black Holes Big Bang, Black Holes, No Math 4
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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 5
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Outline What makes Black Holes black What a black hole would look like to a nearby observer Evidence for Black Holes Diff t t f Bl k H l Different types of Black Holes A few words on why black holes are so important in cosmology and our understanding of the Big Bang, Black Holes, No Math Big Bang
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Moving Towards Black Holes If the neutron star has a “ iti l ” ( b t 3M ) it “critical mass” (about 3M Sun 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 7
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Why do we call it a black hole? Call it a Black Hole because light can’t “escape” Say more about what this means Big Objects and Black Holes Topic 3: Properties of Black Holes Big Bang, Black Holes, No Math 8
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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 9
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Compressing the Sun What if we Far outside the Sun you compressed the Sun into a Neutron Star? can’t really tell the difference You can tell the difference if you are l t very close to the Sun itself Big Objects and Black Holes Topic 3: Properties of Black Holes Big Bang, Black Holes, No Math 10 The sun is now a few kilometers across
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Compress the Sun into a Black Hole Again, far outside the Sun you can’t 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 11
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What does this have to do with light being able to ? escape?
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