I'm sure we have all heard of Planet X. The proposed planet whose orbit is further out than Pluto. In fact, Pluto was found because of Planet X. For centuries, humans thought that there were only 6 planets: Mercury, Venus, Earth, Mars, Jupiter, and Saturn. But as science advanced, astronomers realized that Saturn's orbit isn't as it should be with only 6 planets, and the hunt began. Soon, Uranus was found, and our solar system all of a sudden was less empty. But just like Saturn, Uranus' orbit isn't as it should be, and the hunt began again for yet another planet. Thus, Neptune joined our solar system. But again, under close examination, Neptune's orbit isn't as it should be, and the hunt began AGAIN. After hunting for years for another planet that was tugging on not only Neptune, but the other planets as well, astronomers finally discover Pluto, of which seemed to have ended the Planet X hunt. However, there was one problem, Pluto is smaller than our own moon. It's impossible for Pluto's small amount of gravity to have the power to alter a planet's orbit such as Neptune's. And the hunt began yet again, and it has been going on since that very realization came to be. Many theories have come up over the years about what and where Planet X might be. From the favored theory of a dark gas giant with its orbit inside the Oort Cloud, just outside the reach of our telescopes. To the crazy theories such as Planet X actually being a red dwarf star with a 25 million year orbit. Interestingly though, there is a disturbance in the Oort Cloud that is making some of the comets in it to gather around a central source of gravity. Have we possibly found Planet X's position? :shrug: Anyway, I know I just posted many of the theories out there, but I was hoping on getting more of them and possibly starting a discussion on this topic. I would love to know what you people think of it.