Related by context. Frequent words. (Click for all words.) 60 extraterrestrials 60 aliens 56 beings 55 extraterrestrial 53 alien 52 UFOs 52 Earthlings 51 earthlings 51 UFO 51 flying saucers 48 spaceships 46 Cylons 46 beasties 46 teleportation 45 interstellar 45 outer space 45 spaceship 45 wormhole 45 creatures 44 mutants 44 androids 44 droids 44 spacecraft 43 sentient 43 Autobots 43 Martian 43 Martians 43 interplanetary 43 Planetary 43 intergalactic 42 homo sapiens 42 interstellar space 42 evolutionists 41 asteroid 41 humans 41 parallel universes 41 monsters 41 Red Planet 40 paranormal 40 Mars 40 supernatural 40 weirdos 40 planetary 39 robots 39 Apophis 39 Alien 39 celestial bodies 39 humanoid 39 phantoms 39 planets 39 Spacecraft 39 cosmic 39 Cylon 39 sci fi 39 Carl Sagan 38 Klingons 38 Brainiac 38 Asteroid 38 comets 38 rovers 38 martian 38 antimatter 38 asteroids 38 apparitions 38 telepathy 38 comet 38 Mars Rover 38 superheroes 38 droid 38 bots 38 Saturn rings 38 Decepticons 37 Saturn moon 37 Terminators 37 starship 37 Zod 37 Singularity 37 flying saucer 37 Phobos 37 NASA 37 alien invasion 37 ghosts 37 Luthor 37 Earths 37 Earth 37 zombies 37 orbiters 37 UFO sightings 37 mystics 37 galactic 37 ghost hunters 36 cosmos 36 human beings 36 creature 36 reptilian 36 Hayabusa 36 Nasa 36 Aliens 36 physicists 36 Space Shuttle 36 science fiction