Chapter 8

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University of Toronto St. George
Astronomy & Astrophysics
Stefan Mochnacki

Chapter 8: Formation of the Solar System 8.1: The Search for Origins Four Criteria For Success of Solar System Formation Theory: (1) Must explain patterns of motions discussed in chap 7. (2) Must explain why planets fall into terrestrial(small, rocky, near Sun) and jovian(large, hydrogen-rich) categories. (3) Must explain existence of huge numbers of asteroids + comets + why they reside in asteroid belt, Kuiper Belt, and Oort Cloud. (4) Must explain gen. pats while allowing exceptions AKA: Uranus Tilt + Earths large moon. Nebular Hypothesis: Propd by Kant + Laplace SS formed from grav collapse of interstellar cloud of gas. Other prop was close encounter hypo Sun + other star collided Failed bc (1) Couldnt 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 doesnt account for other planetary systems observed. Nebular hypothesis became Neb
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