Compare Worlds
Put any objects side by side, with sizes drawn to true relative scale.
Mars
Earth
Disc areas drawn to true relative diameter. Objects with no defined radius (spacecraft, nebulae) are omitted from the picture.
| Property | Mars | Earth |
|---|---|---|
| Type | Planet | Planet |
| Radius | 3,390 km | 6,371 km |
| Surface gravity | 3.71 m/s² | 9.81 m/s² |
| Day (rotation) | 24.6 h | 23.9 h |
| Year (orbit) | 687.0 days | 365.2 days |
| Distance | From 55 million to 400 million km from Earth; about 225… | You are here — 149.6 million km from the Sun |
| In one line | Once wet, now cold, the rusty desert world next door is the main target for human… | 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.