extraterrestrial

Etymology

From extra- + terrestrial.

adj

1. Originating from outside of the Earth's atmosphere, from space, or from another planet; alien to Earth or its environment.
   Residents of the city of Voronezh insisted today that lanky, three-eyed extraterrestrial creatures had indeed landed in a local park and gone for a stroll and that a seemingly fantastic report about the event carried Monday by the official press agency Tass was absolutely true. October 11, 1989, Esther B. Fein, “U.F.O. Landing Is Fact, Not Fantasy, the Russians Insist”, in The New York Times, →ISSN, →OCLC, archived from the original on 2012-10-12, Section A, page 6

noun

1. A being originating from outside of the Earth's atmosphere, from space, or from another planet; an alien
   Smith returns in Men In Black 3 as a veteran agent of a secret organization dedicated to policing the earth’s many extraterrestrials. May 24, 2012, Nathan Rabin, “Film: Reviews: Men In Black 3”, in The Onion AV Club