### 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 = -Gm1m2/r²
```
• F - the force on each object (toward the other).
• G - the gravitational constant.
• m1 and m2 - 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-2m2 (i.e., m3 kg-1 s-2), where:

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

(constant,gravity,physics)
http://en.wikipedia.org/wiki/Gravitational_constant

Referenced by pages:
chirp mass (Mc)
general relativity (GR)
hydrostatic equilibrium
innermost stable circular orbit (ISCO)
Jeans length
Kelvin-Helmholtz timescale (KH timescale)
mass function
Planck units
precession