### gravitational constant

**(G)**
(indicates how much pull between two masses)

The **gravitational constant** (**G**) is an experimentally-determined
value that relates gravitational force between any two objects
to their masses and the distance between them.
The force is proportional to the product of the masses
and inversely proportional to the square of the distance
between them, and the gravitational constant relates
the masses and distances to the magnitude of the force:

F = -Gm_{1}m_{2}/r²

- F - the force on each object (toward the other).
- G - the
*gravitational constant*.
- m
_{1} and m_{2} - mass of the two objects.
- r - distance between the two objects.

The currently-determined value of the gravitational constant is
6.67430 × 10^{-11} N·kg^{-2}m^{2}
(i.e., m^{3} kg^{-1} s^{-2}),
where:

- N - Newtons (force units of 1 kg·m·s
^{-2}).
- kg - kilograms.
- m - meters.
- s - seconds.

(*constant,gravity,physics*)
**Further reading:**

http://en.wikipedia.org/wiki/Gravitational_constant

**Referenced by pages:**

chirp mass (M_{c})

general relativity (GR)

hydrostatic equilibrium

innermost stable circular orbit (ISCO)

Jeans length

Kelvin-Helmholtz timescale (KH timescale)

mass function

Planck units

precession

Schwarzschild radius

standard gravitational parameter (μ)

stellar structure

Toomre Q parameter (Q)

virial parameter

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