Alien Anomalies

Do we know what the gravity is like on Mars?

The reason I ask is because a rock such as the one in this photograph is 'perched' at a very steep angle and I was wondering if this is due to the difference in gravity on the different planets?

The rock is the one in the middle distance, a little right of centre and one quarter of the way down the picture.

Actually I have answered my own question and I post it here for everyone else to know too.

Since Mars has less mass than Earth, the surface gravity on Mars is less than the surface gravity on Earth. The surface gravity on Mars is only about 38% of the surface gravity on Earth, so if you weigh 100 pounds on Earth, you would weigh only 38 pounds on Mars.

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Answers.com says this The equatorial gravity on Mars is 3.69 m/s² or 0.376g (37% that of Earth).
If you weighed 100 lbs on Earth you would weigh 37.7 lbs on Mars

And for a bit of fun, you can enter your weight into this form and see what you would weigh on other planets