Related by context. Frequent words. (Click for all words.) 51 star gazers 50 unaided eye 49 stargazers 48 skywatchers 48 optical telescopes 47 sky gazers 47 amateur astronomers 47 telescopes 47 interplanetary spacecraft 47 Skywatchers 46 Stargazers 46 Astrophysicists 45 lightning flashes 45 observatories 44 astronomers 44 Gamma ray bursts 44 active galactic nuclei 44 Astronomers 44 Telescopes 43 Titan Saturn 43 Jupiter moons 43 celestial objects 43 total solar eclipse 43 Saturn moons 43 stargazer 43 particle physicists 43 astronomical objects 43 glow worms 42 Cosmic rays 42 darkened skies 42 habitable planets 42 habitable zones 42 X ray Observatory 42 twinkling stars 42 stargaze 42 solar corona 42 astronomical observations 42 nebulae 42 darkness 41 longest solar eclipse 41 Saturn moon 41 microlensing 41 spotting scopes 41 constellation Orion 41 NASA Kepler 41 alien civilizations 41 telescope 41 predawn darkness 41 THEMIS 41 Astronomy 41 Andromeda galaxy 41 physicists 41 observatory 41 COROT 41 thunderclouds 41 wispy clouds 41 orbiting planets 41 cosmologists 41 squinted 40 celestial object 40 orbiting Saturn 40 cumulus clouds 40 Hurtling 40 Andromeda Galaxy 40 stargazing 40 Pan STARRS 40 distant galaxies 40 NASA Cassini 40 auroras 40 Astrophysicist 40 sunbeams 40 satellites orbiting 40 Cassini orbiter 40 Perseid meteor shower 40 IceCube 40 celestial 40 gravitational lensing 40 NASA ESA Hubble 39 rovers Spirit 39 solar eclipses 39 starlit 39 distant galaxy 39 astronomer 39 occultation 39 particle detector 39 Space Telescope 39 moon Titan 39 innermost planet 39 infrared telescope 39 Cancri 39 optical telescope 39 vastness 39 cloudy sky 39 Galaxy Evolution 39 illuminate 39 Orion Nebula 39 starry skies 39 partial eclipse 39 substorms 39 towering peaks 39 Observatories