An odd little moon that orbits closely to Saturn just revealed its biggest mystery: a hidden ocean that lies beneath its heavily cratered surface.
Astrobiologists suspect there could be alien life just out of reach in our solar system, in oceans hidden beneath icy crusts on moons circling Jupiter and Saturn. But unlike the surface of Mars, which can be explored by rovers and landers, these mysterious oceans are currently inaccessible to us. In an effort to…