Categorizing objects in the universe can be difficult.  The fiasco with Pluto over the last decade is more than proof of that.  We generally look to location and then to size as the two main methods for classifying the stuff that permeates the cosmos.  Galaxies contain stars, which host orbiting planets, which host orbiting moons; While asteroids fly in between planets and icy comets are wander through the outskirts of star systems. But what about the in-between objects? Often we find strange things in strange places. There are moons in our solar system that are larger than planets.  What would...