Geography 2090A/B Lecture Notes - Lecture 7: Orion Nebula, Formation And Evolution Of The Solar System, Protostar

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Gas & dust cloud forms in orion nebula. This disk is hundreds of light years across. The disk slowly gets bigger and bigger and thus heavier. Thus it begins to collapse on itself. The collapse is the beginning of the solar system. Circular motion occurs in the disk due to nearby explosion. Material starts to flatten out to form a disk. Proto star begins to form at centre. Gets bigger and has a gravitational pull. Materials close to the protostar are sucked in or evaporated from the heat. Material is far away to be not be sucked into the sun. Temperature is low enough so that ice can form from gases (frostline) Faster in the outer solar system (past the ice line) Particles are not sticking together due to strong gravity but instead because of the generation of friction and static electricity from the collision. Two large proto planets in the outer solar system collide.

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