ESSE 1010 Lecture Notes - Dwarf Planet, Space Debris, Partial Melting

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To be or not to be a planet. Definition of a planet: large enough to be rounded by its own self gravitational forces, not a satellite of another object in the solar system, has cleared its orbit of space debris. Pluto: not considered a planet because it spins around the sun yet it does not pick up all the space debris in its orbit: one of ~200 relatively minute chunks of rock and gas (i. e. planet and their. Earth moons: their planet from the sun, trapped in orbit about the sun by the sun"s gravity. It drifts through space at a speed of ~30km/sec. Formation of earth: earth formed by accretion of space debris left over form the formation of the sun about 4. 6 billion years ago, collisions of planetsimals (tiny planets) orbiting the sun. Accretion of earth: accretion growth increased mass larger gravitational attraction further accretion, growth & larger gravity still.

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