Before revision: Extraterrestrial life The mediocrity principle suggests, given the existence of life on Earth, that life typically exists on Earth-like planets throughout the universe .Chaisson, Eric, and Steve McMillan.
After revision: Extraterrestrial life The mediocrity principle suggests, given the existence of life on Earth, that should life exist elsewhere in the universe, it will typically exist on Earth-like planets .Chaisson, Eric, and Steve McMillan.