First of all, you're really comparing apples to oranges when complaining that physics in another universe are not the same as ours. Let me start off by saying that if you support superstring theory, each universe has its own set of rules. Because there are an infinite number of universes, there is a very real possibility that there exists a "Star Wars" universe.
In Star Wars' universe, we can probably assume that they have the ability to manipulate gravity. Given this, the beings there have probably altered the gravity of all planets to be the same. After all, they do have the ability to stop light and form a blade with it.