Actually, if it's moving slowly enough to orbit you'll need a huge amount of energy to send it on its way. I think that the star they have discovered is believed to have been 'slingshotted' past a black hole just like we slingshot probes past the inner planets to get to the outer planets.
And as far as SE IV/V is concerned, wouldn't it be cool to be able to divert asteroids towards inhabited planets? In the new 3D 'real time' combat system, you could actually have the chance to attack and divert/destroy the incoming threat, too.
