Somebody said this to me

[Zen Badger]

Sorry it took me so long to find an answer( I'm not a mathematican)

Try this

http://www.last-word.com/content_handlin.../2755.html

Specifically this reply,

Yes, eventually they will make contact. Although the attraction is very small, it will cause the objects to accelerate towards each other The formula for determining the attractive force between two objects was determined by Newton and is F= G x m1 x m2/dxd, where F is the force in newtons, G is the gravitational constant, m1 and m2 are the masses of the two objects and d is the distance separating them. G = 6.6726 x 10-11N-m2/kg2 Solving for 1 kg objects and 10,000,000,000,000 Meters (~ 1 LY) gives a force of 6.67 x 10^-37N I leave the calculation of the time needed for contact as an exercise for the reader :-)