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(Click for frequent words.) 84 telescope 77 observatories 75 optical telescopes 69 Telescopes 69 Telescope 68 infrared telescopes 67 optical telescope 66 Keck telescopes 66 astronomers 65 observatory 65 amateur astronomers 64 robotic telescopes 64 WM Keck Observatory 63 Very Large Telescope 63 adaptive optics 63 astronomical telescopes 62 orbiting telescopes 62 Keck telescope 62 X ray observatories 62 astronomy 61 ESO VLT 61 hexagonal mirrors 60 astronomical telescope 60 Keck Observatory 60 Telescope LSST 60 infrared telescope 60 orbiting Hubble Space Telescope 60 ESO Very Large Telescope 59 Keck Telescopes 59 inch refractor telescope 59 Array ALMA 59 X ray telescopes 59 Atacama Large Millimeter Array 59 Keck Telescope 59 fainter objects 59 astronomical observations 59 Spitzer infrared 58 Submillimeter Array 58 Amateur astronomers 58 LOFAR 58 Gemini telescopes 57 Mauna Kea Hawaii 57 Very Large Array 57 Astronomy 57 submillimetre 57 Arecibo Observatory 57 Cerro Paranal 57 ESO Paranal Observatory 57 spectrographs 57 Spitzer Space Telescope 57 microlensing 57 gamma ray telescopes 57 exoplanetary 57 Subaru Telescope 56 refracting telescope 56 inch Samuel Oschin 56 XMM Newton 56 radiotelescope 56 X ray observatory 56 observatory telescope 56 VLBA 56 spectrometer 56 atop Mauna Kea 56 inch Schmidt Cassegrain 56 interferometer 56 meter Keck telescopes 56 submillimeter wavelengths 56 astronomy observatory 56 extrasolar planets 56 GALEX 56 satellites 56 astrophysical phenomena 55 Lowell Observatory 55 astronomer 55 occultations 55 quasars 55 WIYN 55 planetarium 55 astronomical observatory 55 HARPS spectrograph 55 spectrometers 55 astronomical objects 55 distant galaxies 55 meter Keck telescope 55 optical infrared telescope 55 celestial objects 55 infrared astronomy 55 Earthlike planets 55 Fermi telescope 55 Pan STARRS 55 HARPS instrument 55 gravitational lenses 55 aperture telescope 55 Faulkes Telescope 55 VISTA telescope 55 Hobby Eberly 55 detect gravitational waves 55 astronomical observatories 55 Subaru telescope 55 distant supernovae 55 Lick Observatory 55 Observatories 55 interferometers 55 gamma ray observatory 54 infrared observatory 54 Dobsonian telescope 54 Steward Observatory 54 Large Binocular Telescope 54 UKIRT 54 Space Telescope 54 seismographs 54 NASA Infrared Telescope 54 infrared 54 Muchachos Observatory 54 COROT 54 inch refractor 54 Kitt Peak 54 X ray wavelengths 54 LIGO 54 inch refracting telescope 54 AERONET 54 Hubble Space Telescope 54 Ritchey Chrétien 54 ESA XMM Newton 54 HIRES spectrometer 54 optical wavelengths 54 RAS Observatory 54 polarimetry 54 exoplanets orbiting 54 transiting planets 54 e MERLIN 54 Adaptive optics 54 distant quasars 54 reflector telescope 54 KBOs 54 planets orbiting 54 Spectrograph 54 Herschel telescope 53 earthlike planets 53 infrared wavelengths 53 NOAO 53 seismometers 53 gamma ray detectors 53 X ray telescope 53 Comet Lulin 53 telescopes astronomers 53 Herschel Space 53 Palomar Observatory 53 ESO telescopes 53 binoculars 53 Hobby Eberly Telescope 53 microscopes 53 Large Synoptic Survey 53 Keck Interferometer 53 LROC 53 Interferometer VLTI 53 portable planetarium 53 Paranal Observatory 53 Paranal Chile 53 radiometers 53 distant galaxy clusters 53 earthshine 53 Galileoscope 53 HiRISE 53 Ultraviolet Optical Telescope 53 Chajnantor plateau 53 spectroscopic observations 53 Evolution Explorer 53 WFC3 53 THEMIS satellites 53 spectroscopic measurements 53 Laser Interferometer Gravitational Wave 53 orbiting telescope 53 Radio Astronomy Observatory 53 astrometry 53 distant galaxy 53 Cerro Pachón 53 Earth orbiting satellites 53 Hubble observations 53 ultraviolet spectrograph 53 NASA Chandra 53 coronagraph 52 ESO telescope 52 particle detectors 52 gravitational wave 52 orbiting observatories 52 steering wheel tilts 52 gamma ray observatories 52 gamma ray bursts 52 Epsilon Aurigae 52 SkyCenter 52 Mars orbiters 52 Gemini Observatory 52 inflatable planetarium 52 Mount Stromlo Observatory 52 distant quasar 52 spectroscopic 52 AKARI 52 Solar TErrestrial RElations Observatory 52 microlensing events 52 extrasolar planetary systems 52 Suzaku X ray 52 CoRoT satellite 52 radial velocity 52 planets orbiting sun 52 HiRISE camera 52 Cerro Pachon 52 gravitational microlensing 52 Atacama Large Millimeter submillimeter 52 Astronomers 52 Cosmic Origins Spectrograph 52 NRAO 52 SKA telescope 52 Hubble 52 NASA Far Ultraviolet 52 Explorer WISE 52 telescope atop Mauna 52 Canary Telescope 52 Long Wavelength Array 52 spaceborne 52 exoplanet 52 millimeter wavelengths 52 TSN PZ camera 52 Samuel Oschin Telescope 52 Hubble Space Telescope HST 52 Sidewalk Astronomers 52 Astrophysical Research 52 imaging spectrometer 52 astrophysicists 51 Pan STARRS telescope 51 Infrared Telescope Facility 51 extrasolar 51 Southern Observatory ESO 51 Observatory Very 51 WISE infrared 51 gaseous planet 51 gamma ray telescope 51 STEREO spacecraft 51 Observatory telescope 51 extragalactic 51 Andromeda Galaxy 51 microshutters 51 gravitational lensing 51 astrophotographer 51 X ray Observatory 51 orbiting spacecraft 51 Arecibo telescope 51 VIRTIS 51 Area Telescope LAT 51 steerable radio 51 Beta Pictoris b 51 Nasa spacecraft 51 infrared imager 51 spectroscope 51 La Silla Observatory 51 faint galaxies 51 IceCube 51 Nasa Kepler 51 ROSAT 51 nebulas 51 RXTE 51 Near Infrared Camera 51 Great Observatories 51 CMEs 51 STEREO mission 51 NIRSpec 51 constellations Cygnus 51 infrared spectrometers 51 exo planets 51 Ring Nebula 51 celestial object 51 infrared spectrograph 51 Context Camera 51 MMT Observatory 51 JWST 51 millisecond pulsars 51 Cassini Huygens 51 Fomalhaut b 51 gamma ray detector 51 comet Lulin 51 E ELT 51 Paranal 51 Observatory 51 Interferometer 51 gravitational lens 51 Quadrantid meteor shower 51 HD#b 50 SINFONI 50 extrasolar planets orbiting 50 photometer 50 amateur astronomer 50 UVOT 50 Mars Reconnaissance Orbiter 50 Gemini Telescope 50 APXS 50 lensing galaxy 50 astronomy buffs 50 cosmic ray observatory 50 ray Space Telescope 50 orbiting satellites 50 Andromeda galaxy 50 Optical Gravitational Lensing Experiment 50 infrared camera 50 CALIPSO 50 MicroFUN 50 transiting exoplanets 50 planets orbiting distant 50 VLTI 50 ASKAP 50 unaided eye 50 telescopes atop Mauna 50 ESO La Silla 50 Cerro Tololo 50 Orion Nebula 50 Thirty Meter Telescope 50 skywatchers 50 wavelengths 50 NASA Wilkinson Microwave 50 Arecibo radio 50 Orionids 50 Lunar Reconnaissance Orbiter LRO 50 Chilean Atacama Desert 50 Burst Alert 50 Dobsonian 50 neutrino detectors 50 GRBs 50 cosmic ray 50 celestial observations 50 Kuiper belt objects 50 supergiant star 50 astrometric 50 Faint Object 50 Pleiades cluster 50 infrared ultraviolet 50 submillimeter 50 LSST 50 KH #D 50 RHESSI 50 HARPS spectrograph attached 50 luminous galaxies 50 Square Kilometer Array 50 telescopic observations 50 SuperWASP 50 Saturn rings 50 orbiting observatory 50 lightwaves 50 Celestron 50 Galilean moons 50 Observatory SDO 50 orbiting gamma ray 50 photometry 50 moon Ganymede 50 submillimetre wavelengths 50 Large Telescope 50 Las Campanas Observatory 50 galaxies 50 Cassini 49 Small Magellanic Cloud 49 Milky Way Galaxy 49 detect gamma rays 49 particle detector 49 transiting planet 49 USArray 49 cosmological distances 49 geosynchronous satellites 49 neutrino particles 49 cosmic microwave radiation 49 spectrograph 49 highly elliptical orbits 49 faraway planets 49 orbiting 49 Planetary Science Institute 49 Telescope Array 49 meteor shower 49 HiRISE images 49 Galaxy Evolution 49 Anisotropy Probe WMAP 49 Infrared Telescope 49 Geminga 49 orbiting Saturn 49 Stargazing Live 49 Cosmic Origins Spectrograph COS 49 colliders 49 LOFAR telescope 49 EarthScope 49 satellites orbiting 49 infrared detectors 49 stargazers 49 SOAR telescope 49 THEMIS 49 Schmidt Cassegrain 49 MG J# +# 49 planetary Transits 49 Carnegie Observatories 49 extrasolar planet 49 twin Keck telescopes 49 Crab Pulsar 49 solar corona 49 CSIRO Parkes radio 49 amateur astronomers peering 49 Amateur Astronomers 49 Orbiter LRO 49 star gazers 49 Adaptive Optics 49 Extremely Large Telescope 49 X ray Telescope XRT 49 RS Ophiuchi 49 spiral galaxy Messier 49 Galilean satellites 49 moon Charon 49 Infrared Array Camera 49 Astrophysicists 49 robotic rovers 49 located atop Mauna 49 DEIMOS 49 visible wavelengths 49 Planck satellite 49 Kepler spacecraft 49 gamma ray burst 49 Comet Holmes 49 interferometric 49 VLBI 49 constellations 49 Multi Object Spectrograph 49 Hobby Eberly telescope 49 astrophotography 49 remote sensing satellites 49 Lyrids 49 SDSS telescope 49 retroreflector 49 LORRI 49 Astrophysics 49 astrophysical objects 49 Geminids 49 Large Binocular Telescope LBT 49 Epsilon Eridani 49 SIRTF 49 APEX telescope 49 satellites orbiting Earth 49 IBEX spacecraft 49 interferometric technique 49 synchrotrons 49 skywatching 49 interferometry 49 #x# binoculars [001] 49 planets 49 orbiting Chandra 48 NASA Great Observatories 48 aboard ESA Envisat 48 auroras 48 Wilkinson Microwave Anisotropy Probe 48 protoplanetary disks 48 eyepiece #/#s f/#.# 48 Wolszczan 48 interacting galaxies 48 Advanced LIGO 48 ALMA antennas 48 Gravitational lensing 48 Chajnantor 48 globulars 48 rocky planets 48 Comet Machholz 48 ESA Planck 48 panoramic camera 48 Comet NEAT 48 FORCAST 48 NASA Gamma ray 48 bolometer 48 pulsars 48 HM Cancri 48 Cygnus Lyra region 48 masers 48 X ray binary 48 stargazing 48 eyepiece 48 foreground galaxy 48 exoplanets 48 constellation Centaurus 48 optical microscopy 48 aurorae 48 WMAP satellite 48 Milky Way galaxy 48 AU Mic 48 Siding Spring 48 CRISM 48 spectrographic 48 slender crescent 48 spiral galaxy NGC 48 Perseus Cluster 48 neutrino detector 48 faraway galaxies 48 Hawaii Mauna Kea 48 submillimeter wavelength 48 MeerKAT 48 Climate Experiment GRACE 48 IYA# 48 Arches Cluster 48 constellations planets 48 Doppler radars 48 Werthimer 48 radial velocity technique 48 Hubble telescope 48 asteroids orbiting 48 particle accelerators 48 exoplanet hunter 48 arcminutes 48 NASA Cassini 48 Terrestrial Planet Finder 48 La Silla observatory 48 Delta Cephei 48 synthetic aperture radar 48 brown dwarfs 48 spotting scopes 48 solar flares 48 UCO Lick 48 polarimetric 48 multiband imaging photometer 48 Spacewatch 48 occultation 48 galaxy clusters 48 NuSTAR 48 stargazer 48 spacecraft 48 magnetospheres 48 UVIS instrument 48 Surveys ACS 48 optical microscope 48 zap boulders 48 meteor showers 48 inhabitable planets 48 GROND 48 planets orbiting stars 48 merging galaxies 48 HUDF 48 Spitzer infrared spectrograph 48 interplanetary spacecraft 48 situ measurements 48 Mars landers 48 rover panoramic 48 Saturn aurora 48 Observatory STEREO 48 constellation Hercules 48 optical interferometry 48 ASTRON 48 Gran Telescopio Canarias 48 Triangulum Galaxy 48 HESS telescopes 48 gravitational waves 48 Heterodyne Instrument 48 Cassegrain telescope 48 Telescope BAT 48 Pierre Auger Observatory 48 X ray emission 48 planetary transits 48 telescopic camera 47 wavelength infrared 47 Sombrero Galaxy 47 starshade 47 spacecraft orbiting 47 Cancri e 47 periodic dimming 47 hyperspectral 47 N. Rathnasree 47 NASA Kepler spacecraft 47 moon Io 47 ESA Integral 47 alien civilizations 47 Submillimeter 47 nanosatellites 47 asteroids 47 NASA STEREO 47 Herschel Planck 47 Deep Impact flyby spacecraft 47 active galactic nuclei 47 Jodrell Bank Observatory 47 telescopes binoculars 47 lidar 47 astrophysical 47 Infrared Thermal Imaging Spectrometer 47 Sommers Bausch Observatory 47 Mauna Kea 47 ultraviolet wavelengths 47 Ikonos 47 hyper spectral 47 Observatory astronomer 47 GPS satellites 47 Astronomical Observatory 47 Stargazers 47 Omega Centauri 47 Gamma ray 47 detectors 47 Upsilon Andromedae 47 Extrasolar planets 47 STScI 47 celestial fireworks 47 CubeSats 47 Higgs bosons 47 GJ #b [002] 47 Roque de los 47 Arecibo radar 47 CloudSat 47 OGLE TR #b 47 sized planets orbiting 47 HiRISE image 47 exoplanet orbiting 47 MARSIS 47 geostationary orbits 47 mySKY 47 ecliptic plane 47 optical microscopes 47 Earthshine 47 zodiacal light 47 dwarf galaxies 47 Solar Terrestrial Relations 47 spacecraft Cassini 47 Pancam 47 galaxy M# [002] 47 blazars 47 NASA Cassini spacecraft 47 PASADENA Calif. Astronomers 47 amateur stargazers 47 Spectrometer 47 sunlike stars 47 coronal loops 47 Cassini flyby 47 radiometer 47 eclipsing binary 47 intrinsic brightness 47 Infrared Telescope UKIRT 47 WIYN Observatory 47 fluorescence microscope 47 Hanny Voorwerp 47 eyepieces 47 Cepheids 47 planetary nebulas 47 constellation Cassiopeia 47 skygazers 47 celestial bodies 47 photometers 47 HARPS 47 William Herschel Telescope 47 Nikon D# Kowa 47 Solar Observatory 47 galaxies nebulae 47 NEOSSat 47 Slooh 47 Convection Rotation 47 EVLA 47 THEMIS spacecraft 47 LiDAR 47 Proxima Centauri 47 StarDate 47 XMM Newton observations 47 starlight 47 Lovell Telescope 47 planetary missions 47 multiwavelength 47 comet 47 novae 47 supergiant stars 47 diffuse aurora 47 gravitationally bound 47 Perseid meteor shower 47 ionospheric 47 Lunar Reconnaissance Orbiter Camera 47 antennas 47 geostationary satellites 47 Manchester Jodrell Bank 47 meteoroids 47 afterglows 47 Galilean Nights 47 Virgo Cluster 47 supernovas 47 Ultraviolet Imaging Spectrograph 47 Heliospheric Observatory SOHO 47 Chamberlin Observatory 47 curved mirrors 47 binocular telescope 47 Rosetta orbiter 47 filamentary structure 47 Thermal Emission Spectrometer 47 Solar System 47 elliptical galaxy NGC 47 AB Aurigae 46 Mossbauer spectrometer 46 exo planet 46 electron microscope 46 synchrotron 46 electron microscopes 46 Quadrantids 46 RRATs 46 Kuiper belt object 46 Landsat satellite 46 called gravitational microlensing 46 scanning electron microscope 46 interferometric observations 46 High Accuracy Radial 46 ULP cepheids 46 discover Fomalhaut 46 cosmic phenomena 46 Astronomical Society 46 infrared interferometry 46 planetary scientist 46 Orion Telescopes 46 Mössbauer 46 thermal emission spectrometer 46 Field Imager 46 NASA Mars Reconnaissance 46 gamma ray flares 46 redshift 46 Cepheid variables 46 Red Rectangle 46 planet orbiting 46 Doppler measurements 46 Fornax cluster 46 wheeled rovers 46 Carina constellation 46 Mars Odyssey 46 solar arrays 46 DISR 46 planets circling 46 Orion nebula 46 Observatory NOAO 46 SOHO spacecraft 46 cryo electron microscope 46 spy satellites 46 TrES 4 46 Hubble Space Telescopes 46 planetary nebulae 46 Hubble Telescope 46 CFHT 46 X ray spectrometer 46 redshifts 46 Harlow Shapley 46 constellation Andromeda 46 gamma ray 46 Spectroscopic Explorer 46 supernovae 46 Mini Thermal Emission 46 refractor telescope 46 parabolic antenna 46 National Optical Astronomy 46 TerraSAR X 46 NASA Landsat 46 Mount Lemmon SkyCenter 46 magnetars 46 Coma Cluster 46 neutrino beam 46 habitable planets 46 pointings 46 Trapezium 46 HiRISE camera aboard 46 bolometers 46 Pleiades star 46 Square Kilometre Array 46 circumstellar disks 46 Australian SKA Pathfinder 46 fluorescence detectors 46 Solar Dynamics Observatory 46 Large Array 46 Ulysses spacecraft 46 infrared spectrometer 46 Planetary Transits 46 astronomical phenomena 46 infrared wavelength 46 Jonathan Lunine 46 AGNs 46 sub millimeter wavelengths 46 moons orbiting 46 Synthetic Aperture Radar 46 amateur skywatchers 46 Cassini orbiter 46 Zeiss projector 46 exoplanets planets 46 X ray beams 46 NASA Goddard 46 constellation Cygnus 46 Astronomy buffs 46 WFPC2 46 Giant Magellan Telescope 46 Kuiper Belt Objects 46 quasar 46 observational astronomy 46 proto galaxies 46 Orbiter MRO 46 galaxy M# [001] 46 multispectral 46 afterglows linger 46 nightglow 46 Infrared Survey Telescope 46 GLAST 46 NASA Lunar Reconnaissance 46 nebulae 46 C1XS 46 Cassini spacecraft 46 shorter wavelengths 46 Earthscope 46 Multi Object Spectrometer 46 Eta Aquarids 46 radial velocities 46 globular cluster M# 46 High Resolution Imaging 46 planetary astronomer 46 planetarium projector 46 noctilucent clouds 46 Astrophysics MOA 46 Auger Observatory 46 Helios 2B 46 Galileo spacecraft 46 Comet McNaught 46 gravity warps 46 Cerro Armazones 46 Comet Hartley 2 46 imager 46 Voorwerp 46 satellite 46 confocal microscope 46 NASAs 46 Saturn Cassini 46 transmission electron microscope 46 Mars Color Imager 46 e VLBI 46 telephoto lenses 46 spectroscopy 46 Anisotropy Probe 46 MARSIS radar 46 spiral galaxy M# 46 asteroid Vesta 46 radar interferometry 45 Venusian atmosphere 45 Reconnaissance Orbiter 45 Magellanic Clouds 45 SPIRE instrument 45 LCLS 45 Bryan Gaensler 45 planemos 45 Hubble Space 45 dimensional holographic 45 photonic crystals 45 spatial resolution 45 binoculars telescopes 45 microscopic imager 45 hubble 45 meteorite hunters 45 occulted 45 geostationary satellite 45 neutrino 45 terrestrial planets 45 MEarth 45 Planetary Laboratory 45 parabolic troughs 45 Digitized Sky Survey 45 origins spectrograph 45 photon counting 45 extraterrestrial civilizations 45 Schmidt Cassegrain telescope 45 hyperspectral sensors 45 star clusters nebulae 45 Perseids 45 planets orbits 45 infrared detector 45 Space Telescope Science 45 Infrared Pathfinder Satellite 45 planet HD #b 45 stargaze 45 polar orbiting satellites 45 remote sensing instruments 45 Eta Carinae 45 BepiColombo 45 flyby Cassini 45 XMM Newton satellite 45 deformable mirrors 45 Garan rode 45 Libra constellation Vogt 45 Polarimetry 45 Gehrels 45 binocular 45 CMB radiation 45 multibeam 45 Pasachoff 45 Coma cluster 45 ENVISAT 45 cosmic cannibal 45 Saturn moons 45 Valles Marineris 45 radio occultation 45 refractors 45 MESSENGER 45 Martian rovers 45 muons 45 constellation Lyra 45 JDEM 45 HRSC 45 Konacki 45 gaseous planets 45 Active Galactic Nuclei 45 ESA Envisat satellite 45 CHARA 45 Jovian moons 45 Comet Hartley 45 comet Hale Bopp 45 constellation Taurus 45 UVIS 45 stellar occultations 45 Mini TES 45 Milky Way halo 45 Geminid 45 Comet Hale Bopp 45 Astronomer 45 GLAST Burst Monitor 45 substorms 45 gigapixel camera 45 dust enshrouded 45 HD #b [002] 45 Particle accelerators 45 Skywatchers 45 SpaceWeather.com 45 Ionosphere Sounding 45 Comet Halley 45 WMAP 45 potentially habitable planets 45 velocity Planet Searcher 45 Long Baseline Array 45 NASA Kepler 45 HD# [005] 45 fainter meteors 45 National Astronomical Observatory 45 reflection nebula 45 telescope eyepiece 45 NIRCam 45 Unit Telescopes 45 Cat Paw Nebula 45 stellar occultation 45 Sojourner rover 45 Space Telescopes 45 Enceladus flybys 45 SIM PlanetQuest 45 D CIXS 45 Perseid meteors 45 HUDF# 45 GMRT 45 synchrotron x ray 45 Leonids 45 Lyman alpha 45 SSRL 45 Planetarium 45 Olympus Mons 45 Globalstar constellation 45 Noctilucent clouds 45 auroral 45 meteorites 45 Herschel Space Telescope 45 LRO 45 parabolic dishes 45 Cloud Aerosol Lidar 45 Lagoon Nebula 45 Planck telescope 45 astro comb 45 WISE telescope 45 Antennae Galaxies 45 meteors 45 celestial sphere 45 Spitzer Space Telescopes 45 cosmic rays 45 scatterometer 45 Solar Orbiter 45 millimeter wavelength 45 infrared spectra 45 AAVSO 45 Binoculars 45 moons orbiting Saturn 45 ultraviolet imaging spectrograph 44 telescopic 44 NEOWISE 44 Dumbbell Nebula 44 Leonid meteor showers 44 Infrared Mapping Spectrometer VIMS 44 unmanned probes 44 protons collide 44 Science Experiment HiRISE 44 NICMOS 44 microscopy technique 44 Saturnian moon Titan 44 shortwave infrared 44 adaptive optics AO 44 Saturnian moons 44 outermost planets 44 spiral nebulae 44 globular clusters 44 CubeSat 44 La Silla Chile 44 ultraviolet 44 Milky Way 44 Kitt Peak Observatory 44 QWIP 44 Magnetic Imager HMI 44 Taurids 44 IR LEDs 44 Extragalactic