7
Characteristics of “Planets”
•Two types of planets
–Terrestrial Planets: small, rocky material: inner solar system
–Jovian Planets: large, H, He gas outer solar system
•
•Small left-over material
provides “fossil” record of early conditions
–Asteroids   –  mostly between orbits of Mars and Jupiter
–Comets   –  mostly in outermost part of solar system
–Meteorites –  material which falls to earth