Yes, but if you're making a Gravity Wars game, the gravity equation is insanely important...and you use planets. Could this be what you're doing? I've always wanted to make a Gravity Wars game but never got around to it.
(To see what Gravity Wars is, just Google "death star battles" and play the Flash knock-off.)
(To see what Gravity Wars is, just Google "death star battles" and play the Flash knock-off.)