Earth's mass, however, isn't distributed evenly. Varying surface topography and the continuous movement of water cause different parts of the globe to have more or less mass than other regions. Here is a map of the gravity field of earth given by NASA. Gravity is inversely proportional to the square of the distance that separates the two bodies. It was recorded by the European Space Agency's GOCE satellite. Hence gravity will decrease as one will go higher in altitude, and hence away from the center of mass. Now, gravity at the earth's surface is g= G m e r 2 where r= radius of earth. For us more regular puny humans, that drops to about three to four times Earth’s gravity. Earth's gravity measured by NASA GRACE mission, showing deviations from the theoretical gravity of an idealized smooth Earth, the so-called Earth ellipsoid. GOCE managed to map the gravitational strength of the Earth beneath it to a precision of 10 –5 m/s 2. But more research is needed to find out if an environment with less than 1G will still be sufficient to maintain good health over time." In physics (specifically, celestial mechanics), escape velocity is the minimum speed needed for a free, non-propelled object to escape from the gravitational influence of a massive body, that is, to achieve an infinite distance from it.

While we commonly quote the gravitational force as 9.81 m/s 2 , … The new Earth gravity map, which was unveiled in late March, is the most accurate model of gravity fluctuations around the world. If g is the acceleration due to gravity and R is radius of earth, the minimum kinetic energy required to make a satellite to move to infinity from orbit which is close to earth is. Escape velocity is a function of the mass of the body and distance to the center of mass of the body. A third answer claims that Earth's gravity is the only gravity level that humans can tolerate over a long term period, yet I would imagine that 0.99G or 1.01G would not be much different than 1G; I can't find an answer citing the gravity levels that all humans can tolerate without any … On the forum, Clifford K said that, "Given gravity very slightly across the Earth, it should be expected that humans can tolerate some differences. And with all his strength, they found he could withstand about 4.6 times Earth’s gravity. Earth’s Gravity: On Earth, gravity gives weight to physical objects and causes the ocean tides. Red shows the areas where gravity is stronger than the smooth, standard value, and blue reveals areas where gravity is weaker.