Related by context. Frequent words. (Click for all words.) 57 intelligent beings 56 extraterrestrial 55 extraterrestrials 51 extra terrestrials 51 Earthlings 50 ETs 50 magnetar 50 extrasolar planet 50 gravitational wave 49 asteroid 49 supernova explosion 49 astronomical objects 48 COROT 48 outer planets 48 outer space 47 robotic spacecraft 47 planets 47 interplanetary 47 rocky planets 47 astrobiologists 47 cosmos 47 Andromeda Galaxy 47 pulsars 47 lifeforms 47 planet 47 alien 47 Jupiter moons 46 Apophis 46 wormhole 46 planetary 46 spacecrafts 46 spacecraft 46 extrasolar planets 46 substorms 46 Cassini Huygens 46 alien spacecraft 46 exoplanet 46 orbiting spacecraft 46 aliens 46 distant galaxy 45 terrestrial planets 45 earthling 45 cosmological 45 cosmologists 45 meteoroids 45 supernova 45 neutrino 45 cosmic ray 45 comet 45 interstellar 45 humans 45 Saturn moon Enceladus 45 earthlings 44 comet Wild 44 satellites orbiting 44 NASA Kepler 44 homo sapiens 44 exoplanets 44 earths 44 supernovae 44 X ray emission 44 moon Europa 44 Saturn rings 44 auroral 44 asteroids 44 astrobiology 44 Higgs boson 44 Mars rovers 44 comet nucleus 44 high temperature superconductivity 44 Earths 43 civilizations 43 gamma ray burst 43 Chandrayaan 43 martian 43 orbiting 43 planet orbiting 43 Alpha Centauri 43 interstellar space 43 globular cluster 43 multiverse 43 spaceship 43 Homo sapiens 43 quasar 43 supernovas 43 astronomers 43 occultation 43 infrasound 43 teleportation 43 ringed planet 43 geosynchronous orbit 43 relativistic 43 ontological 42 Extraterrestrial 42 brown dwarfs 42 HD #b [002] 42 Orion Nebula 42 spiritual beings 42 theoretical calculations 42 beings 42 Eta Carinae