Two of Jupiter's moons
Io Europa Ganymede Callisto
From Brightest to Dimmest: Ganymede Io Europa Callisto Use JPL's HORIZONS web ephemeris to look up apparent magnitudes of jovian satellites.
Io, Europa, Ganymede and Callisto are the four satellites that orbit Jupiter.
Ganymede is the brightest moon out of Ganymede, Europa, Io, and Callisto. It is the largest moon of Jupiter and is even larger than the planet Mercury. Ganymede's surface is composed of a mix of rocky material and water ice, which likely contributes to its brightness.
Europa is one of Jupiter's moons. Actally theres Europa, Callisto, Ganymade, and Io. :] Ganymede, Io, Europa and Callisto Jupiter has 67 moons, of which four are major. Those moons are Io, Europa, Ganymede, and Callisto.
No, they are not. Europa and Ganymede are two of planet Jupiter's 63 moons!
Europa is closer
Io Europa Ganymede Callisto
Europa, Ganymede, and IO :)
From Brightest to Dimmest: Ganymede Io Europa Callisto Use JPL's HORIZONS web ephemeris to look up apparent magnitudes of jovian satellites.
Answer is an estimate using mean orbital radius Europa 670,900km Ganymede 1,070,400km So their closest estimated point would 399,500km (not calculating Europa's furthest distance to Jupiter with Ganymede's closest when they're in astronomical alignment)
Io, Europa, Ganymede and Callisto are the four satellites that orbit Jupiter.
Satelites of Jupiter
The four largest moons of Jupiter discovered by Galileo are Io, Europa, Ganymede, and Callisto.
going by the magnitude scale, Callisto's the brightest. Io 5.5 Europa 5.7 Ganymede 5.1 Callisto 6.1
Europa is the second large moon of Jupiter, orbiting between the moons Io and Ganymede.
It is Jupiter.