Ganymede

The largest moon

The largest moon in the Solar System, bigger than Mercury.

Educational illustration · shapes and sizes are not to scale.

Orbiting: Jupiter
Category: Natural satellite

What makes this world interesting

Its size does not make it a planet: it orbits Jupiter. It has its own magnetic field.

Observe or explore it

Like the other Galilean moons, it is easy to follow with a telescope when sufficiently separated from Jupiter.

Connect the discoveries

Jupiter

Sources and reference information

NASA Science — Ganymede

Rounded educational data, sources consulted on 18 October 2026. Orbital distances are mean reference distances from the Sun, not current distances from Earth. Periods are expressed in Earth time. The planner provides date-specific positions for supported targets.