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L15.2

L15.2 - Formation of Solar System “Nebular Theory” or...

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Meteoroids – rocky bodies, like asteroids, only smaller (<10 m) Meteors – flash of light given off in our atmosphere as meteoroid hits atmosphere, burns up Meteorite – a meteoroid which has landed on Earth *** Most meteors caused by meteoroid no bigger than grain of sand Meteor shower – caused when Earth intersects the orbit of a comet Perseids – Aug 12-13 (50/hr) Leonids – Nov 17-18 33 year cycle (last in 2001) Geminids – Dec 13-14 most reliable (~50/hr) Names refer to the constellation they’re coming from
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Unformatted text preview: Formation of Solar System “Nebular Theory” or “Condensation Theory” • Nebula – big cloud of gas in outer space 1. Giant gas cloud 2. Begins to contract (gravitational collapse), spin, heat up, flattens (just like pizza dough ‘za’ OR ‘qi’) 3. “Seeds” of planets begin to condense in rotating disk 4. “Planetesimal” form by accretion – sucking gas around it 5. Sun starts shining, solar wind blows rest of material away...
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