Top 10 Space Conspiracy Theories

Illuminati and Majestic-12
Were Harry S. Truman and NASA director James Webb part of a secret government agency called Majestic-12? Image courtesy NASA

Secret governments are a staple in conspiracy theories. According to William L. Moore, a "UFOlogist," Majestic-12 was a code name for a secret government department headed by U.S. President Harry Truman. The purpose of this department: to deal with extraterrestrial beings [source: CSI]. Skeptics say that the documents Moore uses to support his claims are forgeries and that no such department exists.

Supposedly, the Illuminati is another secret organization with ties to space. There are hundreds of different theories about the Illuminati, some of which say it's the organization to which all other secret governments report. In what is possibly the strangest theory on this list, some people claim that the Illuminati are the descendants of the union between humans and an extraterrestrial reptilian race. According to this theory, these hybrid descendants have infiltrated the highest levels of government in countries around the world. The supposed goals of the Illuminati range from simple world domination to preparing the Earth for extraterrestrial colonization. Skeptics say there's no evidence to support the existence of the Illuminati, but conspiracy theorists say that the lack of evidence actually proves the group exists. Believers say the Illuminati is so effective that the group has erased almost all evidence of its existence.

Speaking of aliens, what's the deal with the Roswell incident and Area 51? Keep reading to find out.