Scientists working on NASA's Cassini mission have discovered no less than 101 distinct geysers on Saturn's small icy moon Enceladus. Just as exciting is the possibility that liquid water may be reaching the surface — making Enceladus a major target for future exploration.
Back in 2005, NASA's Cassini spacecraft sent back images showing what appeared to be plumes of water vapor spewing out from fractures, called "tiger stripes," near Enceladus's southern pole (similar to what was recently detected on Europa, another icy moon with a subsurface ocean). Gravitational measurements made from 2010 to 2012 proved that these plumes were originating from a large reservoir of liquid water underneath the moon's icy surface. Furthermore, NASA also learned that Enceladus is comprised of two layers: an external icy shell and an internal rocky core made of silicates. This tiny moon could therefore feature a potentially habitable environment — one that could even be more hospitable to life than Europa.