Talk:Neptune/@comment-4728735-20120804072118

But thinking in the literal, no moons do and no moons can (I think) spin around there axis due to the way in which they cool from a molten mass, and the tidal locking effect after billions of years of orbits of a planet. Therefore I believe that it is a binary planet system that has a planet and a moon planet with such a slow rotation it is not noticed.