Europa, along with Jupiter's three other large moons, Io, Ganymede, and Callisto, was discovered by Galileo Galilei on 8 January 1610 by Galileo Galilei, and possibly independently by Simon Marius.
Europa Io was discovered by Galileo Galilei on 8 January 1610 by Galileo Galilei, and possibly independently by Simon Marius. This was along with Jupiter's three other large moons. Io was Ganymede. Io was Callisto.