Ganymede
Moon of Jupiter
The largest moon in the Solar System, bigger than the planet Mercury and the only moon with its own magnetic field.
Key facts
- Orbits
- Jupiter
- Diameter
- About 5,262 km
- One orbit
- 7.2 days
- Notable for
- Largest moon in the Solar System
About the Ganymede
How to recognise it
Ganymede has a patchwork surface of older, dark, cratered areas and younger, lighter regions crossed by grooves and ridges.
What makes it special
It is the largest moon in the Solar System and is even wider than Mercury. It is also the only moon known to have its own magnetic field.
Sources
Facts checked: 29 October 2026
