# Mars

*In the Solar System*

Half the Earth's width and a tenth of its mass, with a thin carbon-dioxide atmosphere at about a hundredth of our pressure - too thin for liquid water to last on the surface, though the ground and the poles hold a great deal of ice. It has the largest volcano and the deepest canyon in the Solar System, a day almost exactly as long as ours, and two small captured-looking moons. More working spacecraft are at Mars than at any other planet.

| | |
| --- | --- |
| Radius | 3,396 km |
| Around the equator | 21,339 km |
| Mass | 6.42 x 10^23 kg |
| Compared with the Earth | 0.107 × |
| Turns once in | 24 h 37 m |
| From the Sun | 228,337,112 km (+194,280 km/d) |
| From the Earth | 272,696,653 km (-853,238 km/d) |
| A signal takes | 15 min |

Distances and speed are computed from JPL Horizons trajectories and are true of 2026-09-05, changing at the rate given beside each. The interpolation itself is good to a few kilometres; what ages these figures is the date, not the arithmetic.

## Elsewhere

- On the live map: https://www.orbitalmap.space/?world=solar-system&focus=mars
- This object as a page: https://www.orbitalmap.space/o/mars/
- Every object: https://www.orbitalmap.space/o/
- What this site is and what it reads: https://www.orbitalmap.space/llms.txt