Jupiter has 67 satellites surrounding it, the four "main moons" you are probably referring to are called Io, Europa, Ganymede and Callisto.
Jupiter does not have 4 moons. It has 64 moons confirmed.
Jupiter has 79 moons and there are 4 major moons; The Galilean moons named after Galileo.
No planet has 4 moons. (planets as far as in our solar system)
Galileo discovered Jupiter's 4 largest moons, the Galilean moons. The largest moon's name is Ganymede.
europa is Jupiter's moon. Jupiter has 4 moons, and Europa is one of them.
there are actually 4 main moons to Jupiter and they are called the Galilean moons their single names are IO, Callisto, Ganymede and Europa hope that helps :)
Jupiter has 63 moons and 4 main moons the main moons are called Io, Ganymede, Europa and Callisto.
jupiter has 4 galilian moons they are europa callisto io and ganymede.
Galileo was the first to look at the planet Jupiter through a telescope, and to observe the moons of Jupiter (the 4 largest moons are still known as the Galilean moons).
pluto has 4 known moons
Io, Ganymede, Callisto and Europa are the four brightest moons of Jupiter.
Galileo did NOT discover Jupiter; just Jupiter's 4 largest moons.