Hubble Provides New Evidence for Subsurface Saltwater Ocean on Ganymede

Scientists using NASA’s Hubble Space Telescope have uncovered new evidence for a massive subterranean ocean on Ganymede, the largest moon in the Solar System and one of the four Galilean moons of Jupiter. Ganymede is slightly larger than the planet Mercury and the only moon in the Solar System to have its own magnetic field. [...] —> Read More