Related by context. Frequent words. (Click for all words.) 69 telescopes 58 telescope 56 optical telescopes 56 observatories 55 Telescope 54 Binoculars 54 amateur astronomers 53 Astronomy 53 Stargazers 51 astronomy 51 WM Keck Observatory 50 stargazers 49 astronomers 49 planetarium 49 celestial objects 48 adaptive optics 47 binoculars 47 Planetarium 47 observatory 46 microscopes 46 unaided eye 46 XMM Newton 46 spotting scopes 45 Astronomers 45 Astronomer 45 Very Large Telescope 45 skywatchers 45 Detectors 44 stargazing 43 Observatory 43 Lowell Observatory 43 celestial bodies 43 distant galaxies 42 seismographs 42 Stargazing 42 Cameras 42 constellations 41 Black Holes 41 amateur astronomer 41 Space Telescope 41 spectrometer 41 Spitzer Space Telescope 41 Perseid meteor shower 41 Gamma Ray 41 planets orbiting 40 Spectrometer 40 Astronomical 40 Meteorites 40 Astronomical Society 40 meteor shower 40 Milky Way Galaxy 40 Optics 40 Lenses 40 Bring binoculars 40 Solar System 40 Hubble Space Telescope 40 infrared detectors 40 Flashlights 40 Hubble Telescope 40 astronomer 40 laser scanners 40 Satellites 39 extrasolar planets 39 Sensors 39 infrared camera 39 Exploratorium 39 Radars 39 meteor showers 39 interferometer 39 quasars 39 MODIS 39 astrophysicists 39 Jodrell Bank 39 Earthlings 39 seismometers 39 imager 38 Radio Astronomy Observatory 38 Celestron 38 Mauna Kea 38 distant galaxy 38 planetariums 38 detectors 38 astrophysical 38 LiDAR 38 Microscopy 38 Infrared 38 gravitational lensing 38 nebulae 38 CMEs 38 Astrophysics 38 magnifying glasses 38 THEMIS 38 auroras 38 lidar 38 Physicists 37 NASA Chandra 37 lunar eclipse 37 infrared 37 Spotters 37 lunar eclipses 37 spectrometers