# gravitational constant

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## gravitational constant

Symbol:*G*. A universal constant that appears in Newton's law of gravitation and is the force of attraction between two bodies of unit mass separated by unit distance. It is equal to 6.672 × 10

^{–11}N m

^{2}kg

^{–2}. Predictions that

*G*is decreasing very slightly with time (by less than one part in 10

^{10}) are not supported by experimental evidence.

Collins Dictionary of Astronomy © Market House Books Ltd, 2006

## gravitational constant

[‚grav·ə′tā·shən·əl ′kän·stənt] (mechanics)

The constant of proportionality in Newton's law of gravitation, equal to the gravitational force between any two particles times the square of the distance between them, divided by the product of their masses. Also known as constant of gravitation.

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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