Related by context. Frequent words. (Click for all words.) 60 extra terrestrials 58 extraterrestrials 58 extraterrestrial 54 intelligent beings 54 UFOs 50 aliens 49 outer space 49 ETs 49 beings 48 alien 48 flying saucers 48 Earthlings 48 earthlings 46 alien spacecraft 46 humankind 44 planet 44 homo sapiens 44 humans 44 creatures 44 moon Europa 43 Carl Sagan 43 mankind 42 mythical creatures 42 planets 42 cosmologists 42 Earth 41 telepathically 41 Homo sapiens 41 extrasolar planet 41 cyborgs 41 global warming 41 UFO 41 cosmos 41 Cylons 40 telepathy 40 rocky planets 40 planetary 40 dinosaurs 40 Creationists 40 oceans 40 creature 40 quantum physics 40 NASA Cassini spacecraft 40 scientists 39 orbiting spacecraft 39 manmade global warming 39 outer planets 39 Red Planet 39 sea creatures 39 moon 39 Martians 39 asteroid 39 Raelians 39 Saturn moon 39 psychics 38 flying saucer 38 UFO sightings 38 Professor Hawking 38 supernatural 38 parallel universes 38 Martian 38 planets orbiting 38 extrasolar planets 38 spaceships 38 interplanetary 38 Stephen Hawking 38 humanoids 38 celestial bodies 38 Charles Darwin 38 afterlife 38 comet Wild 38 Mars rovers 38 Humans 38 gravitational waves 38 human beings 37 antimatter 37 HD #b [002] 37 intergalactic 37 evolutionists 37 Hawking 37 Richard Dawkins 37 sentient 37 humanity 37 earths 37 astrobiology 37 cyberspace 37 prehistoric 37 distant galaxies 37 astronomers 37 biosphere 37 lunar missions 37 organisms 37 vampires 37 ancients 37 winged creatures 37 single celled organisms 36 psychic powers 36 distant galaxy 36 ancient civilization 36 Lord Vishnu 36 climate change