Planets Going Backwards
Since Pierre Laplace, scientists have thought that solar systems condense from rotating disks of gas. As a result, the planets should orbit the same direction as the star rotates, as in our solar system. Unfortunately nature does not follow the theory. The very existence of "hot Jupiters" challenges the old theory. Orbiting so close to their parent star, these planets should boil away. The theory can not explain how planetary embryos can form from dust. If particles collide at orbital velocity they will ricochet rather than stick together.
If these planets formed around Black Holes, they would follow the Black Hole's rotation independently of the parent star. The Black Hole would not suck these planets up, but would stabilize their centres. As a result Jupiter-size planets could exist very close to Suns, as observed. Black Holes could exist within most planets, even Earth. Planets orbiting in the opposite direction from their stars are another sign of Black Holes where no one has thought to look.