The largest moon in the Solar System is bigger than Mercury and hides an ocean beneath its icy surface

Ganymede, Jupiter’s largest moon, possesses planet-like dimensions and a hidden ocean. This moon is larger than Mercury and contains more water than Earth’s oceans. Ganymede also generates its own magnetic field, which is unique among moons. Its layered interior includes an iron core and a rocky mantle. These features make Ganymede an extraordinary and planet-like celestial body.