This was
your sky.

Europa's Surface

The smallest of Jupiter's Galilean moons, Europa, has an icy surface that looks like Earth's sea ice. The dark streaks are likely cracks from Jupiter's immense tidal stresses. This image from the Voyager spacecraft gives us a hint of an ocean of liquid water beneath Europa's frozen surface. It's a tantalizing prospect, making Europa a key target for missions like Galileo.