G is the universal gravitational constant: 6.67x10-11 N<sup>2</sup>/kg<sup>2</sup>. It is used in Newton's formula for the gravitational force between two objects, which is | G is the universal gravitational constant: 6.67x10-11 N<sup>2</sup>/kg<sup>2</sup>. It is used in Newton's formula for the gravitational force between two objects, which is |