Re:Lagrange point (Score 2, Informative)

It's not where the gravity of one large object equals the gravity of the other. The five Lagrange points in a two object system are points where the forces from the two objects add together to result in a centripetal acceleration, which cause a third object place there to orbit at the same rate as the smaller of the original two.

See my other post in this thread:
http://science.slashdot.org/comments.pl?sid=140724 &threshold=1&commentsort=0&tid=160&tid=14&mode=thr ead&pid=11786996#11787170