AST101H1 Lecture Notes - Lecture 15: Outer Core, Planetesimal, Strong Gravity
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AST101H1 Full Course Notes
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Rhea is one of saturn"s moons, its composition is probably: If the planet and moon started with the same temperature, which will be cooler in 1 billion years. Moon, because it has a greater surface area to volume ratio. The moon has many craters, this tells us. The surface of moon is old, there is little atmospheric wind on the moon, there hasn"t been much volcanic activity in these areas for a long time. Stars are born in clouds of gas and dust. Stars produce heavier elements from lighter ones. Stars return material to space when they die. A planetesimal (asteroid or comet) strikes the surface. Collision vaporizes the rock and creates an enormous explosion. Earthquakes cause vibrations to travel through the earth. P waves compression (p for push) S waves side to side (s for sway) Differentiation: light materials rise to the surface. Dense materials fall to the core, converting gravitational potential energy into thermal energy.
