Water vapor on Ganymede
Jupiter's moon Ganymede is the largest moon in the solar system and, at 5262 km in diameter, is even larger than the planet Mercury. But while the planet closest to the sun is dry and hot, Ganymede is the complete opposite. The moon harbors more water than all the Earth's oceans combined. However, because it orbits so far from the Sun, most of the water is frozen. All of it? No. At a depth of 160 kilometers, there is a liquid ocean beneath the icy crust, warmed by the gravitational pull of the gas giant Jupiter. But even on…
