AST101H5 Lecture Notes - Lecture 6: Moon
Document Summary
The solar system= the sun"s system o o o. Sun is more than 99% of all of the matter in the solar system. Sun"s radiation warms the objects in the solar system. Recall: the edge of the solar system is about half way to the nearest star= limit of the sun"s gravitational dominance o. Measure the nearest star"s distance using parallax edge= 1. 5 x. edge varies because the sun and the nearby stars are moving. This is very far beyond pluto (only 100 au) or comets o o. Mass volume= average density~ 5 g/cm3 (large density) note: rock ~ 3 g/cm3. Planets like jupiter= jovian planets (jove is another name for jupiter) o. Masses are large; 14. 5 to 318 x earth"s mass. Average densities~ 1 g/cm3 (small density) note: water ~ Pluto (1930), quaoar (2002), sedna (2004), orcus (3004), eris (2005), Beyond neptune very cold o o o o. Tiny diameters most are smaller than earth"s moon.
