10.24.07 Astronomy notes

10.24.07 Astronomy notes - Astronomy...

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View Full Document Right Arrow Icon – Astronomy Planetesimals were kicked out of solar system by Jovian planets (gravitational assist) Sometimes they are kicked out to great distances – create the Oort cloud Comets formed in outer solar system – most of water on earth brought by comets Silicon, Iron, Magnesium, Aluminum + Oxygen (Rocks) Too hot for gases no gas giants Too hot for water to accrete Asteroid Belt (between mars and Jupiter): a planet was forming there, but interrupted by Jupiter. Ceres = dwarf planet, largest object in belt. Kuiper Belt: - Inside of Neptune’s orbit, objects were thrown out into the Oort cloud - Outside of Neptune’s orbit, objects remain and become part of Kuiper Belt Protosun becomes sun - Nuclear burning begins - Radiation and gas pressure - Removed most all gas and dust in the nebula - Accretion ends (of small particles – gas and dust) - Whole process takes about a million years Collisions continue – almost every planet shows evidence of a major impact
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This note was uploaded on 09/24/2009 for the course ASTR 101 taught by Professor Christiansen during the Fall '08 term at UNC.

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10.24.07 Astronomy notes - Astronomy...

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