•Because
planets captured gas as they were forming
they had
small “solar” nebulae Þ tests of nebula theory
–Regular
satellite systems
•Large
moons in direct (i.e. counterclockwise), equatorial orbits
•Preserve
solid material from time of formation
•Jupiter
shows solar-system like density gradients
–Rings
•
•Moons
unusual and interesting objects in their own right
–Io
– most volcanically active body in solar system
–Europa
– also active, may have liquid water ocean (and life!)
–Titan
– only satellite with a thick atmosphere
–
•Many
properties are due to tidal
forces and resonances