AST101H5 Lecture : AST101H5 Solar System Astronomy (2ND)
Document Summary
Dwarf planets, like pluto, eris natural satellite (moons) orbiting planets minor planets= asteroids, there are thousands comets, billions meteoroids= rocks made up of ice, dust how big is the solar system big does not have enough information don"t memorize the numbers, will never ask just find out how we know and meaning understand what would be different if the number were different (mass of jupiter meaning leads us to) how big is dart earths raiuds= 6,378 km diameter 12,756km remember units how did we learn earth"s radius what does earth"s radius tell us, like if earth were a different size what would be different numbers in ratios ratios compare numbers, more informative example radius moon/ radius earth= 1738/6378= 0. 272 or rmoon=0. 272 x rearth ratios have no units numbers in scientific notation since we use very large numbers and ver small numbers we need to use this example distance form earth to sun.
