Quote Originally Posted by Conradine View Post
Since planar travel is possible, "simply" travelling to another planet in the material plane should be a piece of cake... more or less.
I don't agree with your premise. Planar travel is categorically different than interplanetary travel. The fact that one is possible has no bearing on the possibility of another - like how, in the real world, the fact that we can go to space doesn't mean we can go to the center of the earth.