Never let the facts get in the way of a good story.

I'm not sure about that. There is allowing for the unknown possibilities of advanced technology in sci-fi, but I don't think people should be expected to put aside what we already know to be empirical facts just to excuse a set-piece in a movie. I mean, sure, the Death Star is colossal, but it's only a space station, made of metal alloys and other manufactured materials. And at 160km across, it's definitely heavy, but I'd like to think most of us know it's nothing next to a planet, or even an average moon. Some people seem to think it's okay to overlook the known laws of physics just because it's sci-fi, which I think is absurd, to be honest. I think requiring viewers to leave their brains at the door is one of the biggest insults a movie can give.