VIDEO: Creepiest Alien Conspiracy Theories

People have always been fascinated with extraterrestrial life. Some would find comfort in knowing that we are not alone in this universe, while others might actually be terrified by the idea. Where do you stand on this? Do you believe in aliens? Do you want them to be real?

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Out of the curiosity of humans, dozens of conspiracy theories regarding extraterrestrial life have emerged over the years. In this video, Shane Dawson present the most fascinating ones out there.

According to Wikipedia, alien life, such as microorganisms, has been hypothesized to exist in the Solar System and throughout the universe. This hypothesis relies on the vast size and consistent physical laws of the observable universe.

According to this argument, made by scientists, such as Carl Sagan and Stephen Hawking, as well as well-regarded thinkers, such as Winston Churchill, it would be improbable for life not to exist somewhere other than Earth.

This argument is embodied in the Copernican principle, which states that Earth does not occupy a unique position in the Universe, and the mediocrity principle, which states that there is nothing special about life on Earth. The chemistry of life may have begun shortly after the Big Bang, 13.8 billion years ago, during a habitable epoch when the universe was only 10–17 million years old.

Life may have emerged independently at many places throughout the universe. Alternatively, life may have formed less frequently, then spread—by meteoroids, for example—between habitable planets in a process called panspermia.

In any case, complex organic molecules may have formed in the protoplanetary disk of dust grains surrounding the Sun before the formation of Earth. According to these studies, this process may occur outside Earth on several planets and moons of the Solar System and on planets of other stars.

Since the 1950s, scientists have argued the idea that “habitable zones” around stars are the most likely places to find life. Numerous discoveries in these zones since 2007 have generated estimations of frequencies of Earth-like planets —in terms of composition— numbering in the many billions though as of 2013, only a small number of planets have been discovered in these zones.

Nonetheless, on 4 November 2013, astronomers reported, based on Kepler space mission data, that there could be as many as 40 billion Earth-sized planets orbiting in the habitable zones of Sun-like stars and red dwarfs in the Milky Way, 11 billion of which may be orbiting Sun-like stars.

The nearest such planet may be 12 light-years away, according to the scientists. Astrobiologists have also considered a “follow the energy” view of potential habitats.

Some bodies in the Solar System have the potential for an environment in which extraterrestrial life can live, particularly those with possible subsurface oceans. Should life be discovered elsewhere in the Solar System, astrobiologists suggest that it will more likely be in the form of extremophile microorganisms.

Mars may have niche subsurface environments where microbial life might exist. A subsurface marine environment on Jupiter’s moon Europa might be the most likely habitat in the Solar System, outside Earth, for extremophile microorganisms.