Ben Stein on Biological Explinations for Planetary Motion

On the Craig Ferguson show, Ben Stein said (in reference to his movie Expelled): “Don’t fire people because they say the planets do stay in their orbits because of something other than Darwinism.”
By “Darwinism” I presume he means the Theory of Evolution which does not address planetary motion in any way, but only describes speciation. In fact, Evolution has absolutely nothing to do with planetary motion (Gravity), the beginning of the universe (Cosmology), or the beginning of life (Abiogenesis), all of which Stein has criticized Evolution for not explaining. Evolution only addresses the origin of Species and Speciation on this planet. To ask it to explain anything else, especially something as different as Gravity is simply foolishness and exposes Stein’s complete lack of scientific understanding.