AS101 Lecture Notes - Lecture 6: Hershel Greene, Roche Limit, Tidal Heating
Document Summary
Voyager (cid:883) and (cid:884) explored the outer planets in the (cid:889)(cid:882)"s and (cid:890)(cid:882)"s. The galileo spacecraft circled jupiter dozens of times in the (cid:883)(cid:891)(cid:891)(cid:882)"s. The cassini huygens orbiter and probe arrived at saturn in 2004. Planet origins: low density because they formed in the outer solar nebula where water vapour could freeze to form ice particles, ice accumulated in proto-planets with density lower than rocky terrestrial and asteroids. Compared to terrestrials: much larger and more massive, composed mostly of hydrogen, helium. Inside jovian planets: all cores appear to be similar. Made of rock, metal, and hydrogen compounds. 10x the mass of earth: uranus and neptune captured less gas from the solar nebula. Not much time for gas captures before nebula was cleared out by solar wind: only jupiter and saturn have high enough pressure for h & he to exist in liquid and metallic states. Jupiter and other jovian planets are all slightly flattened.
