At p. 505, Mr. W. L. Carpenter states that the average specific gravity of surface-water, at a sufficient distance from land to be unaffected by local disturbances, was 1·02779, At p. 513 ...

Its surface gravity is 37.5 percent of Earth’s. Mars rotates on its axis every 24.6 Earth hours, defining the length of a Martian day, which is called a sol (short for “solar day”).

Some objects fall differently depending on how gravity and air resistance interact. A feather, for example, is light and has a large surface area, meaning it will fall to the ground slowly.

A Revolutionary Look Beneath Mars’ Surface The new gravity map, developed using data from multiple Mars missions, including ...