Ganymede

Ganymede is the largest moon in the Solar System, even larger than the planet Mercury. It's one of Jupiter's four Galilean moons and is known for its unique characteristics:

Key features of Ganymede:

• Size: It's the largest moon in the Solar System.

• Magnetic Field: Ganymede is the only moon with its own magnetic field, similar to Earth's.

• Ice and Rock: Its surface is primarily composed of water ice, but it's believed to have a rocky core.

• Subsurface Ocean: Evidence suggests the presence of a vast saltwater ocean beneath its icy surface.

• Craters and Grooves: Ganymede's surface is a mix of heavily cratered regions and younger, grooved terrain.

Ganymede's subsurface ocean makes it a potentially interesting target for astrobiology research, as it could provide a suitable environment for the development of life.