AST101H1 Lecture : Chapter 8

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AST101H1 Full Course Notes
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AST101H1 Full Course Notes
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aka: uranus tilt + earth"s large moon. Nebular hypothesis: prop"d by kant + laplace ss formed from grav collapse of interstellar cloud of gas. Other prop was close encounter hypo sun + other star collided failed b/c (1) Couldn"t account 4 orbtial motions of planets or division of planets into two major categories (2) collision btw. Sun and star significantly improbable stars separated too far. chance of encounter so small that would be difficult to imagine happening once to form ss and doesn"t account for other planetary systems observed. Nebular hypothesis became nebular theory successfully predicts success of other planetary objects. Idea of solar nebula: cloud of gas that collapsed under its own gravity to form our ss. Gas that made of sn contained apprx 98% h and he + 2% of all other elements. Three processes of sn alteration: (1) heating: temp of sn increased as collapsed .

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