The exact value is not know but it is approx 6.67408*10^(-11) m^3kg^(-1)s^(-2)
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Gravitational constant was determined by lord Henry cavendish in 1798 using a torsion balance .....G=6.67 *10^-9
6.67*10-11 Nm2 Kg-2
Cavendish measured the gravitational constant "G".
The gravitational constant was found by Newton, not Einstein.
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.