GEO 303 Lecture Notes - Lecture 4: Eucrite, Comet Nucleus, Near-Earth Object
23 Dec 2017
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Lectures 4, 5, & 6: outer planets, asteroids, and comets. Outer planets: rocky cores several earth masses in size, dense atms of h & he, similar to sun, but enriched in heavier gases relative to. Initially, interaction w/ gas in the disk caused jupiter & saturn to migrate inward. Later, as the gas began to clear, they changed direction & migrated outward, pushing uranus & neptune as well. Where did the other moons come from: mars: phobos & demios, small, irregular bodies (insufficient gravities); similar composition to many asteroids (probably used to be asteroids) ! captured. Ptolemy: believed that the earth was at the center of the universe, the relative motions of the sun & planets were associated w/ 6 concentric spheres, bc planetary motion cannot be described by a simple circle, ptolemy. Corrected his model by adding the concept of epicycles .
