Related by context. Frequent words. (Click for all words.) 84 telescope 77 observatories 69 Telescope 66 astronomers 65 observatory 65 amateur astronomers 63 adaptive optics 62 astronomy 57 Astronomy 57 Spitzer Space Telescope 56 spectrometer 56 extrasolar planets 56 satellites 55 astronomer 55 quasars 55 planetarium 55 spectrometers 55 distant galaxies 55 celestial objects 54 infrared 54 Hubble Space Telescope 54 planets orbiting 53 infrared wavelengths 53 seismometers 53 binoculars 53 microscopes 52 gamma ray bursts 52 Astronomers 52 Hubble 52 exoplanet 52 astrophysicists 51 Observatory 50 amateur astronomer 50 Mars Reconnaissance Orbiter 50 infrared camera 50 wavelengths 50 Saturn rings 50 galaxies 50 Cassini 49 spectrograph 49 orbiting 49 meteor shower 49 stargazers 49 gamma ray burst 49 constellations 49 Astrophysics 49 planets 48 auroras 48 pulsars 48 stargazing 48 exoplanets 48 Milky Way galaxy 48 Hubble telescope 48 brown dwarfs 48 solar flares 48 galaxy clusters 48 spacecraft 48 meteor showers 48 gravitational waves 47 asteroids 47 lidar 47 Mauna Kea 47 GPS satellites 47 detectors 47 celestial bodies 47 LiDAR 47 starlight 47 comet 47 antennas 47 supernovas 47 Solar System 46 electron microscope 46 synchrotron 46 Astronomical Society 46 planetary scientist 46 redshift 46 Mars Odyssey 46 solar arrays 46 spy satellites 46 gamma ray 46 supernovae 46 quasar 46 Cassini spacecraft 46 imager 46 satellite 46 spectroscopy 45 spatial resolution 45 neutrino 45 Space Telescope Science 45 binocular 45 MESSENGER 45 Astronomer 45 Planetarium 45 meteorites 45 LRO 45 meteors 45 cosmic rays 45 Binoculars 44 telescopic 44 ultraviolet 44 Milky Way