The 18th moon of Jupiter, which has no name is refered to as "S/2003 J 3"
It is 2 kilometres in diameter.
Jupiter's largest moon, Ganymede, is as big as the planet Mercury.
Europa?
Jupiter's moon Ganymede is as big as Mercury but is classified as a moon because it orbits Jupiter rather than orbiting the sun directly. Planets are celestial bodies that orbit the sun directly, while moons orbit planets. Ganymede's orbit around Jupiter classifies it as a moon rather than a planet.
The biggest moon is "Ganymede" which is a moon of Jupiter.
Only that they are planets with some of the biggest moons. Earth is solid, Jupiter is gaseous. Earth has no ring, but Jupiter has one that can barely be seen! Earth has one big moon (If a moon the same size orbits Jupiter, that moon is a great moon), while Jupiter has a ton of moons! Also, 1000 Earths can fit into a Jupiter.
None. Some of the moons of Jupiter are nearly the size of Mercury, but no planet has a moon as big as the planet itself.
Jupiter is so big that the Earth would orbit Jupiter.
A moon of Jupiter is called a Jovian moon.
Jupiter is the planet with the moon Europa
Ganymede is the largest moon of Jupiter (5262 km diameter) - its just a bit bigger than Mercury (4880km diameter), while Castillo is the second largest moon of Jupiter (diameter is 4820 km), which is just a bit less than Mercury's diameter- almost the same size.
"Callisto" is the farthest of the big moons. However there are over 60 others. The present record holder is the moon called "S/2003 J2".
The seventh Moon of Jupiter is Elara