Geography 2090A/B Lecture Notes - Lecture 3: Snowball Earth, Late Heavy Bombardment, Asteroid Family
18 Apr 2018
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Earth: 75 million years after collapse: earth & thea shared orbit, thea and earth were in a shared orbit and collided, this collision is absolutely vital to how earth developed and. Nearly mature solar system: the moon is thought to have been created from the leftover of how life, water and everything else developed. Thea that the earth didn(cid:495)t absorb: 500 million years after collapse: planets formed orbits not yet stable, debris/planetesimals interfere with orbits. Jupiter is moving towards the sun (flings out: as jupiter moves in it clears out a bunch of the early solar system. Towards stability: 500-700 million years after collapse: jupiter and saturn reach orbital resonance (find a good gravitational distance between the two, causing them to maintain their location) Magnetic fields: mercury has low magnetic field which allowed the sun to take away all the gases from mercury.
