Flying around and between planets

Hi peeps,

I'm trying to make my character fly around an object, like in this game:

http://www.y8.com/games/gravity_gambit

Right now I have a semi-working script that involves planets with rotating transforms, and making the game character a child of one if it gets close enough. Trouble is, when I try to launch away from the planet, I go in the wrong direction.

Any idea how I might achieve this? I don't think using real physics is a good idea, since this project is 2D.

Thanks in...

Flying around and between planets