Moon of Saturn
Diameter: 1528 km
Distance: 527040 km (mean)
Period: 4.518 days
Eccentricity: 0.001
Inclination: 0.33°
Magnitude: 9.6

Discovered in 1672, Rhea is the second largest moon of Saturn, a small, cold, airless body that is very similar to sister moons Dione and Tethys. Rhea is three quarters ice and one quarter rock. Models suggest that Rhea could be capable of sustaining an internal liquid water ocean through heating by radioactive decay.