AST101 Lecture - October 30.pdf

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Department
Astronomy & Astrophysics
Course
AST101H1
Professor
Michael Reid
Semester
Fall

Description
AST101 - The Sun and its Neighbours October 30, 2012 2nd midterm review: Tuesday 4-6 PM - Interiors and Atmospheres of the Terrestrial Planets - Larger planets cool more slowly than smaller ones, but they are heated jut as quickly (or quicker) - so larger planets are hotter, more molten, more convective, and more geologically active than smaller ones, if they're all the same age - larger planets have thin lithospheres, plate tectonics, volcanism, and few craters - smaller ones have thick lithospheres, no plate tectonics or active volcanoes, and lots of craters - the heat sources all decline as a planet gets older, and the cooling effects stay the same - therefore planets get more solid and less geologically active over time - the moon's dark spots (maria) are craters billions of years old which filled with lava back when the Moon had a molten core. They haven't changed since - why doesn't sunshine matter that much as a heat source? ▯ ▯ - surface of the earth is warm but not too toasty ▯ ▯ - core of the earth is as hot as the surface of the sun MARS: Cold Climate Very thin atmosphere, no oxygen Almost
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