Related by context. Frequent words. (Click for all words.) 52 skywatchers 49 Kitt Peak 48 stargazers 48 amateur astronomers 46 NASA Kepler 45 meteor shower 45 THEMIS 44 aurora borealis 44 aurora 44 Palomar Observatory 44 crater rim 44 Stargazers 44 Lick Observatory 44 auroras 43 Lowell Observatory 43 meteor showers 43 observatory 43 constellation Orion 43 astronomers 42 Mars Reconnaissance Orbiter 42 amateur astronomer 42 Perseid meteor shower 42 Saturn moons 42 Opportunity rover 42 OGLE 42 rock outcrop 42 geomagnetic 42 Jupiter moons 42 XMM Newton 42 meteoroid 42 Earth asteroids 42 dust devils 42 COROT 41 moon Charon 41 Kepler telescope 41 astrobiologists 41 meteors 41 astronomy 41 binoculars 41 Space Telescope 41 microlensing 41 telescopes 41 stargazer 40 extrasolar planet 40 MESSENGER 40 orbiting spacecraft 40 star gazers 40 Leonids 40 NASA Cassini spacecraft 40 observatories 40 sunspot 40 CMEs 40 celestial object 40 telescope 40 Astronomers 40 storm chasers 40 optical telescopes 40 panoramic camera 40 Bring binoculars 40 Cassini imaging 40 constellation Perseus 40 darkening sky 40 meteor 39 cosmic rays 39 cosmic ray 39 Kepler 39 moonless night 39 moonrise 39 Cassini Huygens 39 unaided eye 39 HiRISE 39 Global Surveyor 39 CALIPSO 39 Perseids 39 Aurora Borealis 39 Hawaiian Volcano Observatory 39 Kitt Peak National 39 extrasolar planets 39 New Horizons spacecraft 39 habitable planets 39 rock outcropping 38 Geophysical Institute 38 Astronomy 38 Geminids 38 Solar Dynamics 38 unmanned spacecraft 38 astronomer 38 comet 38 stargazing 38 meteoroids 38 X ray emission 38 Saturn moon Enceladus 38 planetary scientist 38 celestial objects 38 ESO Very Large Telescope 38 super Earths 38 gravitational wave 38 gravitational waves 38 birders 38 infrared telescope 38 Alaska Mount Redoubt