In a message dated 1/4/04 10:21:01 AM, Slyatpct writes: << Since Mars has a mass that is 0.11 times the mass of the Earth and a radius that is 0.53 times the radius of the Earth we expect the surface gravity to be 0.11/(0.53)2 = 0.4 times the Earth's >> Let's see a bear figure THAT out