Lecture22 - Big Bang, Black Black Holes No Holes, No Math...

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ig Bang Black Big Bang, Black oles No Math Holes, No Math ASTR/PHYS 109 Dr. David Toback ecture 20 & 21 Massive Things: Galaxies, Stars and Black Holes Topic 2: Stars Big Bang, Black Holes, No Math 1 Lecture 20 & 21
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Prep for Today (Is now due) ±–L 2 2 Reading: BBBHNM 17 Reading questions: Chapter 17 End-of-Chapter Quizzes: Chapter 15 aper Stuff Paper Stuff Paper 2: Misgraded? Let us know aper 3: isgraded Let us know Paper 3: Misgraded? Let us know Paper 4: will be assigned when we start Chapter 17 Massive Things: Galaxies, Stars and Black Holes Topic 2: Stars Big Bang, Black Holes, No Math 3
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Unit 5: Big Objects 1. Galaxy Formation 2. Star Birth and Death ore on Black Hole Formation and Today 3. More on Black Hole Formation and Properties of Black Holes t turns out that the way Galaxies and It turns out that the way Galaxies and Stars form is very similar… start ere there The way stars “die” depends on the star itself… sometimes they die to form a Black Hole Massive Things: Galaxies, Stars and Black Holes Topic 2: Stars Big Bang, Black Holes, No Math 4
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Today’s Lecture A star is born Nuclear reactions and gravity keep stars alive and make them shine he life of stars: shining and The life of stars: shining and converting hydrogen into heavier elements ife and death of stars like our Sun Life and death of stars like our Sun Life and death of massive stars Massive Things: Galaxies, Stars and Black Holes Topic 2: Stars Big Bang, Black Holes, No Math 6
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Death of Stars ventually the “fuel” Eventually, the fuel ns out and the star runs out and the star starts to die Consider big stars and little stars Massive Things: Galaxies, Stars and Black Holes Topic 2: Stars Big Bang, Black Holes, No Math 36
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The Death of Stars ithout the fuel to make Without the fuel to make things “expand,” gravity starts to crush the atoms loser and closer together closer and closer together From there what happens next depends on the “mass” of the star Massive Things: Galaxies, Stars and Black Holes Topic 2: Stars Big Bang, Black Holes, No Math 37
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How Long do Stars Live? eird: stars with huge mass die Weird: stars with huge mass die faster than lighter stars. Why? The more massive the star, the hotter it needs to be to balance its gravitational attraction he hotter the star the faster The hotter the star, the faster the nuclear reactions occur The sooner it burns out ome stars can last as little as
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Lecture22 - Big Bang, Black Black Holes No Holes, No Math...

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