6.67*10-11 Nm2 Kg-2
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Gravitational constant was determined by lord Henry cavendish in 1798 using a torsion balance .....G=6.67 *10^-9
Cavendish measured the gravitational constant "G".
The gravitational constant was found by Newton, not Einstein.
The exact value is not know but it is approx 6.67408*10^(-11) m^3kg^(-1)s^(-2)
The gravitational constant "G" is the same everywhere. The force of gravity on the moon, expressed as the acceleration of a falling body is 1.62 metres/sec2. compared with 9.81 m/s2 on the earth.