Europa (moon)

Europa (originally refered to as Jupiter II) is a Jovian moon, one of the four galilean moons, and the sixth-closest Jovian moon to Jupiter.

Discovery of Europa
Europa was discovered by Galileo Galilei on January 8, 1610. Europa was discovered alongside Io, Ganymede and Callisto on the same day. Europa was orginally thought to be the second-closest moon to Jupiter, until 4 other moons were discovered, pushing Europa to sixth.

Possibility of Life on Europa
Life is thought to exist under the surface of Europa, due to beliefs of a gigantic ocean under the crust of Europa. An unammned spacecraft was in development, and sent to Europa and other Jovian moons was planned, but NASA cut off all funds for the probe.