Mars is about half the size of Earth, and only about a tenth of its mass. That means gravity is not as strong there. On Mars, a 100 pound woman would weigh only about 38 pounds.
Here's how Mars compares to Earth:
Earth |
Mars | |
| Diameter | 12,756 km |
6,794 km |
| Moons | 1 |
2 (Phobos, Deimos) |
| Gravity | 1.00 |
0.379 |
| Average temp. (Celsius) | 13.85 |
-55.15 |
| Distance from Sun | 140,600,000 km |
227,940,000 km |
Look at an animation comparing the sizes of the planets here. (Requires a Quick-Time plugin)