What is the size of Mars compared to the size of Earth? Does that affect gravity?
The size of Mars is much smaller than the size of Earth. The diameter of Mars is roughly half the diameter of Earth. We know that the mass of Mars is about one tenth the mass of Earth. This is what is expected if Mars is composed of (very) roughly the same constituents as Earth. The combination of these facts means that gravity at the surface of Mars is smaller than at the surface of Earth. Gravity is a result of masses attracting one another and when the mass of Mars is only about one tenth that of Earth, one could maybe expect gravity at the surface to be very much smaller than it is on Earth. However, because the diameter of Mars is only half that of Earth, if you stood on the surface of Mars you would be so much closer to the center of Mars that gravity amounts to 38 % of gravity at the surface of Earth. So in principle you would be able to jump more than 2 times as high on the surface of Mars as you can here (on Mars you would need to wear a heavy space suit which would reduce the
