Europa

The four Galilean moons are called: Io, Europa, Ganymede and Callisto.

Europa is a moon of Jupiter.

Europa and Enceladus are thought to have an ocean of liquid water beneath their surface.

Beneath the icy crust of Europa, one of Jupiter's moons, lies a liquid ocean that may have more water than Earth contains.

The ice on Europa is generally hundreds of miles thick.

The Galileo and Voyager missions provided evidence that Europa has a liquid water ocean under an icy crust.

Europa is thought to have subsurface liquid water.

Although Europa is thought to have the ingredients needed to support life—water, energy, organic compounds—it lies outside of our solar system's habitable zone.

NASA, the American space agency, noted an unusual shape — a bend — in Europa’s magnetic field in 1997.

NASA, the American space agency, noted an unusual shape -- a bend -- in Europa’s magnetic field in 1997. That was the year when NASA’s Galileo spacecraft passed close to the moon.