AST101 - L20 [Nov 25]

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University of Toronto St. George
Astronomy & Astrophysics
Stefan Mochnacki

AST101 L20 [Nov 25] 8.1 The Search for Origins What properties of our solar system must a formation theory explain? o Patterns of motion of the large bodies Orbit in same direction and plane Generally spin in same direction (some exceptions) o Planets fall into two major categories: Small, rocky terrestrial planets Large, hydrogen-rich jovian planets o Swarms of asteroids and comets populate the solar system Asteroid belt Kuiper Belt Oort Cloud o Several notable exceptions to these trends stand out: Uranuss odd tilt Earths relatively large moon What theory best explains the features of our solar system? o 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 o Close Encounter Hypothesis states that the planets formed from debris torn off t
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