Lecture 14 - 1 Class Vote Question o What is the heaviest...

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1. Class Vote Question o What is the heaviest of the elements below that is produced by nuclear reactions in the core of a massive star? Helium Oxygen Silicon Iron Hydrogen 2. Core Collapse o Building up iron in the core o Eventually so much iron builds up, theres nothing to hold it up and the core collapses o Hot enough for gamma ray photons to fly around, which can start to reverse the process and turn iron back into helium This cools the star which is a bad thing because then you have even less chance of increased pressure to hold the core up o Neutrinos carry energy away and cools down the core as well o Runaway process of collapsing-- lasts just a 1/4 of a second o Most of the core becomes just a sea of neutrons o Decreases in size from about the size of the earth to less than the size of Baton Rouge, still has the mass it had before (teaspoon of white dwarf stuff would weigh about the size of an elephant, this would weigh a lot more) 3. "It ain't over til it's over" o
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