Geography 2090A/B Lecture Notes - Lecture 4: Late Heavy Bombardment, Space Station, Orion Nebula
18 Apr 2018
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Document Summary
Gas and dust cloud forms in orion nebula. Proto star beings to form at centre pulls in material. 100,000 years after collapse materials close to the proto star are sucked in or evaporated. 2 million years after collapse planet formation begins. 6 million years after collapse two large proto planets in the outer solar system collide. Resulted in a planet large enough to attract any nearby gas. 6. 1 million years after jupiter has grown to about 90% of its current size. 10 million years after most dust is gone. Core of sun reaches nuclear fusion of hydrogen and helium. 50 million years after collapse jupiter orbits towards are of planetesimals and proto planets proto planets. Another belt forms outside the orbits of neptune and uranus. Earth: 75 million years after collapse earth and thea shared orbit. 80 million years after collapse earth and thea collide.
