Compare Worlds
Put any objects side by side, with sizes drawn to true relative scale.
Ganymede
Earth
Disc areas drawn to true relative diameter. Objects with no defined radius (spacecraft, nebulae) are omitted from the picture.
| Property | Ganymede | Earth |
|---|---|---|
| Type | Moon | Planet |
| Radius | 2,634 km | 6,371 km |
| Surface gravity | 1.43 m/s² | 9.81 m/s² |
| Day (rotation) | 171.7 h | 23.9 h |
| Year (orbit) | 7.2 days | 365.2 days |
| Distance | About 628 million km from Earth on average (riding with… | You are here — 149.6 million km from the Sun |
| In one line | The largest moon in the Solar System is bigger than Mercury and has its own magnetic… | The only place in the universe where life is confirmed to exist. We call it home. |
“—” means the property doesn’t apply or isn’t defined for that object. Full sourced figures live on each object’s own page.