that is a good point. <br /><br />so, then, this may be a stretch, but would you consider any of the moons of jupiter or saturn to be captured planets? <br /><br />i'm still thinking about the fixed lagrange positioning from a prior orbital path. the orbit, then, would "decay" to the point where it would simply STOP and get parked at the lagrange point. the moons orbital period would go from tidally locked, moving ever slower than the parent body, to totally stopping and parking. that is tripped out!!