Stock photography, photos: Alien Crossing Planet Earth future Stock photos of Alien Crossing Planet Earth future Photograph: © David Zanzinger Click for a larger image and more information Keywords associated with this stock photo: Color, colour, vertical, digital enhancement, extraterrestrials, extraterrestrial life, alien, aliens science, fiction, outer, space, aliens, spaceship, extraterrestrial, futuristic, planet , earth, film, funny, humor, person, sun