August 1st, Lecture 10.docx

1 Page
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Department
Astronomy & Astrophysics
Course Code
AST201H1
Professor
Marija Stankovic

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Description
August 1 , Lecture 10, AST201H1 Best learn about the life cycle of people by bringing home the crowds on the street. More massive stars take less time to form! 0 billion years- 10% He, 90% H Sun starts to shrink  release gravitational potential energy. Excess goes to heating up. Release gravitational potential energy  ignite hydrogen shell burning. Hydrogen shell burning is so intense that it floods the outer layers of the Sun with more energy than they receive. The sun expands dramatically. Also turns red. The sun while on main sequence, the sun as a red giant. This will be about 100 million years after leaving the MS. Helium fusion turns on very suddenly. Helium flash. “lives again!” fusing helium to make
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