Pluto is closer in size to Earth than Earth is to Jupiter, but we lump them both into the same category. There was a real concern that we were going to find th

Pluto is closer in size to Earth than Earth is to Jupiter, but we lump them both into the same category. There was a real concern that we were going to find thousands of Pluto sized objects in the kuiper belt, and that when we observed them up close they were just going to look like big comets. Instead it turns out there are only a handful and they are fascinating worlds with many similarities to other planets.