Jupiter's Largest Moon Could be Hiding a Secret Ocean 10 Times Deeper Than Earth's

Believe it or not, astronomers are abuzz about another sea that may be a home for life, and it's not on Saturn's Titan or Enceladus, or Jupiter's icy satellite Europa. New observations have found that Europa's neighbor, Ganymede, which happens to be the largest moon in our solar system, may play host to a massive habitable ocean - one hiding just beneath its rugged surface.