Isn't it not massive enough to still be undergoing radioactive decay? Or does it's crust act as an insulator keeping the heat--leftover from when it was radioactive--inside?
Isn't it not massive enough to still be undergoing radioactive decay? Or does it's crust act as an insulator keeping the heat--leftover from when it was radioactive--inside?
Tidal resonances. Enceladus is in 2:1 orbital resonance with Dione (two orbits of Saturn for every orbit of Dione).