Ganymede
The largest moon in the solar system, bigger than Mercury, with its own magnetic field.
About
Ganymede is the largest moon in the solar system, even larger than the planet Mercury. It is the only moon known to possess its own magnetic field. Ganymede has a subsurface ocean and a differentiated interior with an iron core.
Properties
Notable Facts
Ganymede is the largest moon in the solar system at 5,268 km in diameter
It is the only moon known to have its own internally generated magnetic field
It is larger than the planet Mercury, though less massive
Hubble observations suggest a subsurface saltwater ocean beneath 150 km of ice
Other Moons of Jupiter
Io
The most volcanically active body in the solar system and innermost Galilean moon.
3,643.2 km
Diameter
1.8 d
Orbit
1610
Discovered
Europa
Jupiter moon with a subsurface ocean considered a prime candidate for extraterrestrial life.
3,121.6 km
Diameter
3.6 d
Orbit
1610
Discovered
Callisto
Jupiter's second-largest moon with the most cratered surface in the solar system.
4,820.6 km
Diameter
16.7 d
Orbit
1610
Discovered