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ArtistExtraterrestrial life has been hypothesized to exist on planets other than Earth. Such lifeforms would range from simple microorganisms to complex alien intelligences akin to humans. However, it is unclear if life and intelligent life are ubiquitous in the cosmos or rare. The hypothesis of ubiquitous extraterrestrial life 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 it would be improbable for life not to exist somewhere other than Earth.[12][13] 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.[14]