Ganymede, (5,262.4 km) is the biggest.
Followed by Callisto (4,820.6 km)
Then Io (with an irregular shape approximately 3,600 km in diameter)
and finally Europa (3121.6 km)
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.
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.
The four biggest satellites of Jupiter are Ganymede, Callisto, Io, and Europa. Ganymede is the largest moon in the solar system and is even bigger than the planet Mercury. These four moons are known as the Galilean moons, named after Galileo Galilei who discovered them in 1610.
Ganymede would appear the brightest from the surface of Jupiter due to its larger size and higher reflectivity compared to Europa, Callisto, and Io. Ganymede is the largest moon in the solar system and has a highly reflective icy surface, making it more luminous when viewed from Jupiter.
Ganymede is Jupiter's largest moon. The top four of its largest moons are Europa, Io, Callisto, and Ganymede.
Io Europa Ganymede Callisto
going by the magnitude scale, Callisto's the brightest. Io 5.5 Europa 5.7 Ganymede 5.1 Callisto 6.1
From Brightest to Dimmest: Ganymede Io Europa Callisto Use JPL's HORIZONS web ephemeris to look up apparent magnitudes of jovian satellites.
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.
Ganymede is the biggest moon in the solar system.
Io, Ganymede, Callisto, and Europa stay in orbit with Jupiter cause Jupiter has a strong gravitational pull on celestial bodies around it.
4 actually, Io, Europa, Ganymede, Callisto
They are the four moons which Galileo discovered: Callisto, Europa, Ganymede and Io.
Europa is smaller than Ganymede and Callisto, but larger than Io. Ganymede is the largest moon in the solar system, and Callisto is the second-largest. Europa ranks as the sixth-largest moon in the solar system.
Io is the third biggest moon of Jupiter. Biggest is Ganymede. 2nd biggest is Callisto. 3rd biggest is Io. 4th biggest is Europa. Diameter of Io is about 3640 kilometers. That's just a bit bigger than Earth's Moon.
There are 4; Europa, Ganymede, Callisto, Io. If I had to pick one, I'd guess Ganymede