GEO 303 Lecture Notes - Lecture 1: Molecular Cloud, Circumstellar Habitable Zone, Outer Core

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The sun: 99. 85% of ss"s mass; 92% h, 8% he; source of solar wind & space weather; powered by nuclear fusion (heat h atoms fuse together to form he) in the core; middle-aged. Mercury: ~6% mass of earth; 0. 39au; . Venus: similar to earth in size, composition, & au (0. 72); clouds of sulfuric acid & a crushing co2 atmosphere; slowest & retrograde rotation; few impact craters; intense greenhouse effect. Earth: 23 degree axis tilt seasons; thick atm, mild greenhouse effect; lots of liquid. Moon: ~1% mass of earth; lower density; dark lowlands (mare) & light, heavily cratered. Asteroid belt: thousands of bodies ranging in size; source of most meteorites. Jupiter: larger than all other planets combined; low density; over 39 known satellites; Calisto: larger than our moon; low density less mass; mixture of rock & ice; heavily. Ganymede: largest galilean; part is heavily cratered, part is not; similar composition to. Europa: denser than ganymede primarily rock; icy surface; lightly cratered;

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