Related by context. Frequent words. (Click for all words.) 60 SETI Institute 54 SETI 44 telescope 43 orbiting spacecraft 43 observatory 43 cosmic ray 42 telescopes 42 JWST 41 interferometer 40 WM Keck Observatory 40 spacecraft 40 atom smasher 39 XMM Newton 39 Space Telescope 39 unmanned spacecraft 39 Mars Reconnaissance Orbiter 37 GLAST 37 orbiting satellites 37 satellite 37 observatories 37 spectrometer 37 Lowell Observatory 37 extrasolar planets 36 THEMIS 35 astronomers 35 planetary scientist 35 satellites 35 Telescope 34 Hubble Telescope 34 orbiting 34 orbiter 34 Planetary Society 34 spectrograph 34 Cassini 34 astronomer 33 Hubble Space Telescope 33 Jet Propulsion Laboratory 32 Hubble 32 extrasolar planet 32 Nasa 32 seismometers 32 seismographs 32 astronomy 32 NASA Jet Propulsion Laboratory 31 Very Large Telescope 31 Hubble telescope 31 Radio Astronomy Observatory 31 lunar orbiter 31 Griffith Observatory 31 astrophysical 31 Space Telescope Science 30 planetarium 30 astrophysicists 30 HiRISE 30 adaptive optics 30 Telescopes 30 collider 29 Mauna Kea 29 Astronomer 29 Space Agency 28 celestial objects 28 comet 28 Smithsonian Astrophysical Observatory 28 geomagnetic 28 aurora 27 NASA Goddard 27 Applied Physics Laboratory 27 solar flares 27 astrophysicist 27 Observatory 27 amateur astronomers 27 Astronomy 26 Exploratorium 26 geodetic 26 Perseid meteor shower 25 aurora borealis 25 meteor shower 25 auroras 24 Planetarium 24 astrophysics 24 Astrophysics 23 Geophysical Institute 23 seismology 22 amateur astronomer 22 Astronomical Society 22 Astronomical 22 meteor showers 21 Envisat 21 volcanologists 21 stargazers 21 Cupola 21 observation deck 21 volcanologist 21 extinct volcano 20 cupola 20 volcano 19 sundial 17 lighthouse 13 museum 11 arboretum 8 botanical garden