AST101H1 Lecture Notes - Lecture 19: Ahuna Mons, Cryovolcano, Solar Wind
27 Nov 2017
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Not extremely important, only 3 will be discuss: pluto, ceres and vesta: ceres. Far away from earth, so we don"t have very clear image of ceres with little details. The (cid:862)dawn(cid:863) spacecraft is currently orbiting ceres. Ahuna mons: a 4km tall cryovolcano (salt water) Located in the main asteroid belt between mars and jupiter. + a thin and dusty outer crust: vesta. Not spherical -> not quite a dwarf planet. Had a huge collision, which created 2 craters with diameters as big as the asteroid itself. Over 1 million asteroids larger than 1km in diameter locate here. Orbit the sun in the same direction as the planets: asteroids. Not large enough to be spherical: meteor. Some meteorites are a part of other bodies that were thrown off in collisions. The (cid:862)new horizon(cid:863) mission by nasa started by launching a rocket to pluto. It took 9. 5 years in 50000 km/h to reach pluto: pluto. 90% of pluto"s atmosphere is nitrogen ice.
