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gravitational constant

A Dictionary of Astronomy | 1997 | © A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997. (Hide copyright information) Copyright

gravitational constant (symbol G) The constant that appears in Newton's law of gravitation. It is the attraction between two bodies of unit mass at unit distance apart. Its value is 6.67428 × 10−11 N m2/kg2 when the distance is expressed in metres and the masses are in kilograms. Although it is described as a constant, in some models of the Universe G decreases with time as the Universe expands (see Brans–Dicke theory), but there is no evidence for this.

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