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Gravity is a force that acts between any two objects with mass. Earth is the largest mass around, and its gravity keeps us bound to the surface of our planet. On Earth, with effort an Olympic high jumper can clear a bar 7.5 feet high and remain in the air for just over one second. The same jumper on the Moon, with gravity six times weaker, could clear a 45-foot high bar and remain aloft for about 8 seconds. How high could you jump on the Moon? Check out the Gravity Comparison tool.