Related by context. Frequent words. (Click for all words.) 55 amateur astronomer 52 observatory 49 planetarium 47 astronomer 47 astrophysicist 46 Astronomer 46 telescope 44 Astronomy 44 astronomy 43 Celestron 43 Exploratorium 42 Adler Planetarium 42 Lowell Observatory 42 Planetarium 42 bird watcher 40 telescopes 40 amateur astronomers 40 Stargazers 40 educator 40 Telescopes 39 avid fisherman 39 rocketry 39 adventurer 39 astronaut 38 theoretical physicist 38 avid traveler 38 Griffith Observatory 38 aeronautical engineer 38 stargazing 38 outdoor enthusiast 38 avid cyclist 38 physicist 38 birder 38 docent 38 meteor shower 38 Starry Night 37 aficionado 37 Observatory 37 ghost hunter 37 airship 37 avid skier 37 Halley Comet 37 OMSI 37 enthusiast 37 naturalist 37 composer conductor 37 UFO 37 astronomers 37 cosmologist 36 electrical engineer 36 balloonist 36 astrobiologist 36 avid hiker 36 Herschel 36 buff 36 planetary scientist 36 orb 36 distant galaxy 36 Hubble 36 outdoorsman 36 Space.com 36 Asteroid 35 Kiwanian 35 orbiting 35 Astronomical Society 35 NASA Goddard 35 resident 35 avid collector 35 celestial 35 cosmic ray 35 GLAST 35 Aurora Borealis 35 Rotarian 35 Space Telescope 35 observatories 35 ARISS 35 adrenaline junkie 35 Dale Chihuly 35 geologist 35 stargazers 35 asteroid 35 ham radio 35 meteor 35 avid gardener 34 glider pilot 34 Telescope 34 Mars rover 34 conservationist 34 moon 34 Perseid meteor shower 34 Mars rovers 34 birdwatcher 34 cartographer 34 avid outdoorsman 34 Hubble telescope 34 Martian 34 engineer 34 environmentalist 34 extrasolar planet 34 mechanical engineer 34 orbiting spacecraft