Enceladus

Enceladus is a moon of Saturn, approximately 500 kilometers in diameter, covered mostly by fresh ice and having a surface temperature as cold as -198°C at noon. It has a variety of surface features, including old and young terrain, and is geologically active due to tidal heating caused by its orbital resonance with Dione. The moon has water-rich plumes venting from its south polar region, which include water vapor, molecular hydrogen, and solid material, and scientists believe that the plumes may be habitable to certain microorganisms.learn more on wikipedia