AST101H1 Lecture : AST101 - L20 [Nov 25]
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8. 1 the search for origins: what properties of our solar system must a formation theory explain, patterns of motion of the large bodies. generally spin in same direction (some exceptions: planets fall into two major categories: large, hydrogen-rich jovian planets: swarms of asteroids and comets populate the solar system. oort cloud: several notable exceptions to these trends stand out: earth"s relatively large moon: what theory best explains the features of our solar system, the nebular theory states that our solar system formed from the gravitational collapse of a giant interstellar gas cloud: the solar nebula. a large amount of evidence supports this hypothesis: close encounter hypothesis torn off the sun by a close encounter with another star states that the planets formed from debris. cannot explain observed motions and types of planets. very unlikely except, maybe, at the earliest stages of formation in a cluster.