Mars
6,792 km (4,220 mi)
Equatorial diameter
The red planet, home of Olympus Mons. Diameter: 6,792 km, just over half of Earth's.
Published
How big is that?
6,792 km is 2 times the Moon and 53% of Earth.
Mars is the 9th largest of the 39 Cosmic Scale objects, and the 9th largest of the 109 objects across all three SizeItUp games.
Size comparison
To scale, smallest to largest: Mars in orange beside the Cosmic Scale objects nearest in size, in teal.
| Object | Size | vs Mars |
|---|---|---|
| Titan (Moon of Saturn)Saturn's giant moon, wrapped in a thick orange haze. Measured at its solid surface. | 5,150 km across | 76% of the size |
| Ganymede (Moon of Jupiter)The largest moon in the Solar System. | 5,262.4 km across | 77% of the size |
| Mars | 6,792 km across | – |
| VenusEarth's neighbour, wrapped in thick clouds. | 12,104 km across | 1.8× bigger |
| EarthHome. Measured across the equator. | 12,756 km across | 1.9× bigger |
In other units
| Metres | 6,792,000 |
|---|---|
| Kilometres | 6,792 |
| Feet | 22,280,000 |
| Miles | 4,220 |
How it's measured
Equatorial diameter. NASA Planetary Fact Sheet.
Planets spin, so they bulge at the equator: the equatorial diameter is a little larger than the distance from pole to pole.
Sources
- nssdc.gsfc.nasa.gov: Mars: 6,792 km.
Checked against the source on .
Could you have guessed it by eye?
Mars is one of the objects in Cosmic Scale, a daily size comparison game: you stretch a shape to the size you think is right beside one you know.