G = 6.673(10) x 10-11 m3 /kg s2
The number in parentheses
denotes the uncertainty in the
last digits; for some years prior to 1999 the number used
to be quoted as G = 6.67259(85) x 10**(-11) in mks units.
It is now agreed that the systematic measurement uncertainty
exceeds the statistical accuracy more than estimated previously.
Source: NIST CODATA
Sir Isaac Newton
constant determines the strength of the gravitational force between physical
objects like galaxies, stars and planets, clouds of dust or light rays.
When the velocities of the bodies are much less than the velocity of light,
when their separation R is large and to the extent that their internal
structure does not affect their interaction, the gravitational force between
two bodies of mass m and M is described by Newton's inverse square law:
Newton's law one can derive Kepler's
laws of planetary motion.
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