Extraterrestrial being
An extraterrestrial being or space alien or alien is a being that originates beyond Earth. Extraterrestrial beings inhabit other planets, moons, or even regions of interplanetary space and may range from relatively simple organisms (including those classified under biological life) to advanced non-human intelligent beings with diverse forms, cultures, and abilities. Some are described as strictly biological, while others are described as non-biological or cybernetic entities.