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(Click for frequent words.) 68 inch refractor telescope 66 refracting telescope 64 planetarium projector 62 inch refractor 61 inch Schmidt Cassegrain 59 inch Samuel Oschin 57 Diviner instrument 56 telescope 56 spectroscope 56 Orion nebula 56 Dobsonian telescope 56 Sidewalk Astronomers 56 reflector telescope 56 planetarium dome 56 Chicago Adler Planetarium 56 Ellery Hale 56 observatory 56 ESO VLT 56 astronomy buff 55 Harlow Shapley 55 Las Campanas Observatory 55 ESO telescope 55 Delta Cephei 55 inflatable planetarium 55 StarLab 55 planetarium 55 portable planetarium 55 armillary sphere 55 astronomical telescope 55 radiotelescope 54 Horsehead Nebula 54 astronomical telescopes 54 Giovanni Schiaparelli 54 Ritchey Chrétien 54 Schmidt Cassegrain telescope 54 Steward Observatory 54 Ring Nebula 54 Galileoscope 54 astronomical observatory 54 SkyCenter 54 telescopes 54 hexagonal mirrors 54 spiral galaxy Messier 54 steering wheel tilts 54 Pleiades cluster 54 Red Rectangle 54 Stellarium 53 camera obscura 53 neutron spectrometer 53 Trifid 53 barred spiral galaxy 53 Omega Nebula 53 APXS 53 astronomy observatory 53 faraway planets 53 UA Steward Observatory 53 Vourlidas 53 Observatory astronomer 53 Refractor 53 Rosette Nebula 53 zoetrope 52 #x# binoculars [002] 52 Dobsonian 52 Telescope LSST 52 Comet Halley 52 MEarth 52 Great Orion Nebula 52 imaging spectrometer 52 Solar TErrestrial RElations Observatory 52 Grote Reber 52 ATST 52 Lick Observatory 52 retroreflector 52 rover panoramic 52 Cerro Pachon 52 Coma cluster 52 Fermi telescope 52 asteroseismology 52 Dumbbell Nebula 52 Cassegrain telescope 52 refractor 52 Upsilon Andromedae 52 steerable radio 52 ESO Paranal Observatory 51 Yerkes Observatory 51 scanning electron microscope 51 Lovell Telescope 51 APEX telescope 51 Palomar Observatory 51 DISR 51 IRC +# 51 Saturn Enceladus 51 Lagoon Nebula 51 Bug Nebula 51 Flandrau 51 Buehler Planetarium 51 planetary nebulas 51 Tycho Brahe 51 extrasolar 51 astrometry 51 astrophotography 51 Cerro Paranal 51 planetary Transits 51 globular cluster M# 51 Panoramic Camera 51 radiometers 51 San Francisco Exploratorium 51 sundials 51 Epsilon Aurigae 50 observatory telescope 50 Solar Observatory 50 astrometric 50 optical telescope 50 Las Campanas Chile 50 HD#b 50 Comet Holmes 50 submillimetre wavelengths 50 La Silla observatory 50 infrared spectra 50 Spectrograph 50 microshutters 50 Peony nebula star 50 Cometary 50 Strasenburgh Planetarium 50 celestial sphere 50 KIPAC 50 hubble 50 sundog 50 COROT 7b 50 #x magnification [002] 50 photometer 50 Zeiss projector 50 Planck satellite 50 AB Aurigae 50 Edmund Halley 50 STARLAB 50 telescope eyepiece 50 Anthony Remijan 50 WMAP satellite 50 diffractometer 50 Hubble Space 50 orbiting gamma ray 50 Smithsonian astronomer 50 astronomer Tycho Brahe 50 exoplanet orbiting 50 inch reflector telescope 50 Rosetta orbiter 50 HiRISE camera aboard 50 called gravitational microlensing 50 KH #D 50 Arizona Steward Observatory 50 Io Europa 50 Ritchey Chretien 50 exo planet 50 astronomer Johannes Kepler 50 LORRI 50 CSIRO Parkes radio 50 infrared astronomy 50 SDSS II 49 astronomy 49 Carnegie Observatories 49 HD# [002] 49 Dominion Astrophysical Observatory 49 astro photography 49 discover Fomalhaut 49 Veil Nebula 49 gamma ray telescope 49 Storrie Lombardi 49 armillary 49 constellation Andromeda 49 AKARI 49 Keck Observatory 49 X ray observatory 49 distant quasar 49 Astrophysics Laboratory 49 rocky extrasolar planet 49 Gravitational lensing 49 reflection nebula 49 orbiting Hubble Space Telescope 49 Peter Capak 49 astronomical observatories 49 Subaru telescope 49 interplanetary spacecraft 49 lunar equator 49 coronal loops 49 Cygnus Lyra region 49 Eagle Nebula 49 submillimetre 49 extrasolar planetary systems 49 Camelopardalis 49 Mossbauer spectrometer 49 solar prominences 49 Wolszczan 49 X ray wavelengths 49 LOFAR 49 Geminga 49 distant supernovae 49 Keck Telescope 49 astrophotographer 49 Chilean Atacama Desert 49 Chajnantor plateau 49 Astronomical Observatory 49 interstellar dust clouds 49 VY Canis Majoris 49 Syrtis Major 49 NASA THEMIS 49 coronagraph 49 zodiacal dust 49 lunette 49 cosmological distances 49 constellation Eridanus 49 Keck Telescopes 49 geodesic 49 avid amateur astronomer 49 HiRISE image 49 STScI 49 theoretical astrophysicist 49 SNfactory 49 galaxy M# [001] 49 novas 49 MIT Haystack Observatory 49 Sommers Bausch Observatory 49 spectrographic 49 adaptive optics 49 Hanny Voorwerp 48 Helioseismic 48 SSRL 48 stereographic 48 infrared telescopes 48 amateur stargazer 48 Methone 48 telescope atop Mauna 48 Hubble Telescope 48 eclipsing binary 48 Newtonian telescope 48 protoplanetary 48 Chamberlin Observatory 48 refractor telescope 48 meteor fireball 48 constellation Coma Berenices 48 Ultraviolet Imaging Spectrograph UVIS 48 Hobby Eberly Telescope 48 ESO Very Large Telescope 48 GALEX 48 Kenneth Libbrecht 48 Pancam 48 Explorer WISE 48 celestial mechanics 48 constellations planets 48 neutrino detector 48 Heliospheric Observatory SOHO 48 Observatories 48 Comet Machholz 48 Stargazing Live 48 Upsilon Andromedae b 48 Muchachos Observatory 48 Hyakutake 48 star clusters nebulae 48 #gy 48 stereoscopes 48 ESA Herschel 48 pinhole camera 48 Trapezium 48 interstellar cloud 48 Sombrero Galaxy 48 Pan STARRS telescope 48 stargates 48 UCO Lick 48 zodiac constellations 48 exoplanetary 48 earthshine 48 ROSAT 48 Optical Gravitational Lensing Experiment 48 observational astronomy 48 Proxima Centauri 48 extragalactic 48 SIRTF 48 Hawaii Mauna Kea 48 Samuel Oschin Telescope 48 Kitt Peak Observatory 48 Antikythera mechanism 48 constellation Bootes 48 whale skeleton 48 Nasa Mars Reconnaissance 48 telescopic observations 48 scanning tunneling microscope STM 48 Caltech physicist 48 NASA Far Ultraviolet 48 astronomical objects 48 Lulin Observatory 48 HIRES spectrometer 48 fulldome 48 PlanetQuest 48 Paranal 48 Omega Centauri 48 Le Verrier 48 Faulkes Telescope 48 Wilkinson Microwave Anisotropy Probe 48 Kuiper belt objects 48 Marc Kuchner 48 geochronology 48 Olympus Mons 48 Avishay Gal Yam 48 High Altitude Observatory 48 tetrahedron 48 Cepheid variables 48 stellar seismology 48 optical telescopes 48 detect neutrinos 48 Quadrantid meteor shower 48 Convection Rotation 48 gravitational lenses 48 planets asteroids 48 Wilhelm Rontgen 48 archaeo 48 radial velocity technique 48 Hipparchus 47 Gamma ray burst 47 particle astrophysics 47 WIYN telescope 47 Goonhilly 47 ESA Planck 47 star Beta Pictoris 47 Caltech astronomer 47 comet Hale Bopp 47 comets orbiting 47 Space Telescopes 47 planetary astronomer 47 Polarimetry 47 Keck Interferometer 47 particle detectors 47 confocal microscope 47 WIYN 47 Observatory SDO 47 ultraviolet spectrometer 47 Observatory STEREO 47 telescopes microscopes 47 Adaptive optics 47 SIM PlanetQuest 47 Kuiper belt object 47 Kuiper Belt Objects 47 MG J# +# 47 magnetic monopole 47 supergiant star 47 constellation Cygnus 47 Cerro Pachón 47 Great Observatories 47 neutron detector 47 StarDate 47 wavelength infrared 47 Pan STARRS 47 photometry 47 UVIS instrument 47 constellation Cassiopeia 47 Mount Stromlo Observatory 47 Transmission Electron Microscope 47 Evolution Explorer 47 Spitzer infrared 47 Triangulum Galaxy 47 polarimetry 47 Paranal Chile 47 Gemini telescopes 47 extrasolar planet HD #b 47 NOAO 47 Roque de los 47 NASA ICESat 47 Herrett Center 47 comet McNaught 47 spectrographs 47 nebulas 47 Starlab 47 Cerro Tololo 47 glass tile mosaic 47 magnetospheres 47 ASTRON 47 MPIfR 47 Leeuwenhoek 47 astronomer 47 Aurigid 47 astronomical observations 47 Kepler Space Telescope 47 moon Io 47 GEO# 47 curved mirrors 47 Planetarium 47 constellation Auriga 47 Thomas Harriot 47 Infrared Astronomical Satellite IRAS 47 Neptune Uranus 47 constellation Cetus 47 Keck telescopes 47 JCMT 47 Coma Cluster 47 millimeter wavelengths 47 celestial observations 47 neutrino telescope 47 extrasolar planet 47 olivine crystals 47 atmospheric neutrinos 47 Wilkinson Microwave Probe 47 stellar occultation 47 Telescopes 47 Lyot 47 Schawinski 47 Helix nebula 47 weak gravitational lensing 47 Spaceweather.com 47 nicknamed Xena 47 Epsilon Eridani 47 adaptive optics AO 47 OGLE TR 47 Interferometer VLTI 47 ghostly glow 47 Slooh 47 infrared telescope 47 Massimo Marengo 47 Gondolo 47 Nicolas Copernicus 47 X ray tomography 47 Diviner 47 gamma ray observatory 47 Herschel SPIRE 47 ESA Integral 47 sextants 47 Beta Pictoris 47 X ray detector 47 Galactic cosmic rays 47 distant quasars 46 Nasa Kepler 46 Martian terrain 46 sunlight glinting 46 Milky Way halo 46 protoplanetary disks 46 Digitized Sky Survey 46 telescopes astronomers 46 Crab Pulsar 46 WM Keck Observatory 46 Caloris 46 filamentary structure 46 astronomer mathematician 46 gravitational microlensing 46 Aerial photography 46 rises majestically 46 Orion Nebula 46 Earthscope 46 Galex 46 Giovanni Cassini 46 SN #A 46 La Silla Observatory 46 Pinwheel Galaxy 46 ALFALFA 46 X ray telescopes 46 Lowell Observatory 46 STEREO spacecraft 46 Keck telescope 46 Fomalhaut b 46 astrophysical phenomena 46 ExplorationWorks 46 Stardome Observatory 46 Exoplanets 46 Schmidt Cassegrain 46 NIRCam 46 T rex skeleton 46 Corot 46 GJ #b [002] 46 moons Phobos 46 proplyds 46 Albert Michelson 46 X ray spectroscopy 46 parabolic mirror 46 Southern Observatory ESO 46 Cuvilly Arts 46 whaleback 46 constellations Cygnus 46 ultraviolet spectrograph 46 Descent Imager Spectral Radiometer 46 HARPS instrument 46 lunar craters 46 heavily instrumented 46 Dennis Mammana 46 James Fanson 46 geodesic domes 46 WISE telescope 46 noctilucent clouds 46 Hatzes 46 astrophysical 46 moons orbiting 46 BLG #Lb 46 Voorwerp 46 nebulae 46 Dwarf galaxies 46 Crab Nebula 46 CoRoT 9b 46 intrinsic brightness 46 faint smudges 46 inhabitable planets 46 Chris Lintott 46 Amateur astronomers 46 NASA STEREO 46 Kielder Observatory 46 Anthe 46 millisecond pulsar 46 BioServe Space Technologies 46 IBEX spacecraft 46 ESO La Silla 46 Alexander Kashlinsky 46 Comet NEAT 46 supernova SN 46 Diamond synchrotron 46 Comet #P/Holmes 46 astronomer Percival Lowell 46 Saul Perlmutter 46 SuperWASP 46 Flandrau Science Center 46 CU Boulder Laboratory 46 lunar meteorite 46 SEGUE 46 AMNH 46 Steven Cummer 46 Exoplanet 46 #x# binoculars [001] 46 orbiting telescopes 46 threedimensional 46 Rosetta lander 46 dust enshrouded 46 RS Ophiuchi 46 WISE infrared 46 smallest exoplanet 46 Gerard Kuiper 46 optical coherence 46 constellation Taurus 46 Astronomy Observatory 46 Orion constellation 46 Butterfly Nebula 46 scanning electron microscopes 46 elliptical galaxy NGC 46 Cosmic Origins Spectrograph COS 46 Roden Crater 46 Mössbauer spectrometer 46 Valles Marineris canyon 46 HUDF 46 Halton Arp 46 Astrophysicist 46 gaseous planet 46 Illuminations Reflections 46 ATLAS detector 46 Cosmic Microwave Background 46 synchrotrons 46 Himiko 46 DEIMOS 46 cylindrical shaped 46 Earthshine 46 Stained glass 46 cluster NGC 46 Hubble astronomer 46 Hubbles 46 Paul Chodas 46 gamma ray detector 46 Valles Marineris 46 circumstellar disks 46 comet hurtling 46 dimming starlight 46 constellation Ursa Major 46 diffraction patterns 46 Herschel telescope 46 Christa McAuliffe Planetarium 46 Jedicke 46 stereoscope 46 Michael Studinger 46 spectroscopic analysis 46 distant galaxy clusters 46 NASA MODIS 46 astrophysicist 46 RAS Observatory 46 interferometric 46 multiband imaging photometer 46 FORCAST 46 domed observatory 46 Corot 7b 46 stellar occultations 46 microlensing events 46 planets comets 46 constellation Carina 46 Sudbury Neutrino Observatory 46 Huchra 46 Hadron collider 46 V# Sgr 46 NuSTAR 46 occultations 46 Magnetars 46 protoplanet 45 globulars 45 Large Synoptic Survey 45 Glassblowers 45 Large Binocular Telescope 45 Star Trek transporter 45 Jupiter moon Io 45 Subaru Telescope 45 Galilean satellites 45 Dendrochronology 45 composer Gustav Holst 45 XMM Newton 45 lunar meteorites 45 Martian craters 45 astronomer Ptolemy 45 Siding Spring 45 sundial 45 Dynamics Observatory 45 polar mesospheric clouds 45 P/# A2 45 Astrophysical 45 Hobby Eberly 45 geometer 45 nebula NGC 45 van Gogh Starry Night 45 polygonal shapes 45 Maunder minimum 45 ecliptic plane 45 celestial object 45 underdrawing 45 Lovis 45 Astrophysics Cambridge Mass. 45 stained glass panels 45 cryo electron microscope 45 Cassini ultraviolet 45 photograms 45 Climatron 45 transiting planet 45 IRAS 4B 45 blackbody 45 tile mosaics 45 Solar Orbiter 45 Array ALMA 45 Invisibility cloak 45 ESA XMM Newton 45 spectro 45 Extrasolar Planets 45 SeaWiFS 45 Digitarium R 45 constellation Hercules 45 galaxy M# [002] 45 Infrared Mapping Spectrometer 45 Arecibo telescope 45 spaceweather.com 45 Martian rovers 45 HD #b [001] 45 gnomon 45 airglow 45 telescopes atop Mauna 45 Cygnus X 45 diffraction gratings 45 Comet #P 45 Heliospheric Investigation 45 double helix nebula 45 Mini Thermal Emission 45 ESO astronomer 45 Woodhenge 45 Fossae 45 Ray Spectrometer 45 orbiting Chandra 45 Suzaku X ray 45 NASA astrobiologist 45 Astrophysical Institute 45 UC Observatories Lick 45 planets Uranus 45 Griffith Observatory 45 slender crescent 45 geomicrobiology 45 periodic dimming 45 glowing brightly 45 astronomers 45 ESO telescopes 45 Galileo telescope 45 Foucault pendulum 45 Charon Pluto 45 spectroscopic measurements 45 Ultraviolet Optical Telescope 45 ionized gases 45 Margon 45 moons circling 45 Planetary Transits 45 emit X rays 45 pallasite 45 Particle accelerators 45 Saturn Cassini 45 absorbs photons 45 Heterodyne Instrument 45 retrograde orbit 45 zodiacal light 45 Super Kamiokande 45 RRATs 45 Lake Cheko 45 exo planets 45 constellation Orion 45 XMM Newton satellite 45 circumstellar dust 45 Magnetic Imager HMI 45 amateur astronomer 45 microscopes 45 Lamont Doherty 45 Mars CRISM 45 ultraviolet wavelengths 45 dusty disks 45 infrared interferometry 45 CfA 45 Fresnel lens 45 Hubble Space Telescopes 45 Advanced Photon Source 45 Ursa Minor 45 fairy tale castle 45 Credits ESA 45 Orion Telescopes 45 Casper Planetarium 45 celestial phenomena 45 London Mullard Space 45 Andromeda galaxy 45 Edmond Halley 45 Astrophysicists 45 theoretical astrophysics 45 Candor Chasma 45 cosmic cannibal 45 leaded stained glass 45 Skyspace 45 Free Electron Laser 45 Pieter van Dokkum 45 Uranian 45 ultraviolet imaging spectrograph 45 HD# [005] 45 HiRISE camera 45 Project Ozma 45 spectroscopic observations 45 Dalcanton 45 Kuiper Belt object 45 Chajnantor 45 Submillimeter Array 45 SPIRE 45 orbiting Hubble telescope 45 Astronomer 45 laser altimetry 45 Digitarium 45 Solar Dynamics Observatory 45 planet Uranus 45 Saturnian moon Titan 45 Pan STARRS PS1 telescope 45 starscape 45 OSIRIS 45 Stanford Synchrotron Radiation Lightsource 45 Konacki 45 meter Keck telescopes 45 optical interferometry 45 planetary geology 45 Carinae 45 electron microscope 45 PASADENA Calif. Astronomers 45 Terrestrial Planet Finder TPF 45 Fleischmann Planetarium 45 outermost planets 45 planets moons 45 crab nebula 45 orbital solitude 45 Substorms mission 45 RXTE 45 constellation Scorpius 45 HESS telescopes 45 Remijan 45 submillimeter wavelengths 45 radiative transfer 45 whirligigs 45 moons orbiting Saturn 45 magnetic polarity 45 Virtual Planetary Laboratory 45 Aurora Borealis 45 CHARA 45 infrared spectrograph 45 inverted microscope 45 Uranus Neptune 45 Imaging Spectrograph 45 cometary material 44 ASKAP 44 spectroscopically 44 supergiant stars 44 trans Neptunian objects 44 Galileo Copernicus 44 Longway Planetarium 44 earthlike planets 44 quasicrystal 44 Cabrol 44 Earthlike 44 nightglow 44 Near Infrared Camera 44 planet Gliese #g 44 Area Telescope LAT 44 Submillimeter 44 Nima Arkani Hamed 44 Ambika P3 44 spacecraft flyby 44 TrES 4 44 scanning tunneling microscope 44 Magellanic 44 spyglasses 44 Laser Interferometer Gravitational Wave 44 Meteorite Men 44 Ulysses spacecraft 44 Comet Hale Bopp 44 Cydonia region 44 Wide Angle Search 44 observatories 44 microlensing 44 Pilachowski 44 Trifid Nebula 44 NIRSpec 44 RHESSI 44 Cepheus 44 Perseus Cluster 44 radio occultation 44 scanning electron microscope SEM 44 Nicholas Copernicus 44 Fahrig 44 waxing crescent 44 ammonite fossils 44 galaxy NGC 44 galaxies collide 44 stargazer 44 carbonaceous chondrites 44 constellation Pisces 44 Pea galaxies 44 Mogao 44 Edwin Hubble 44 Galaxy Evolution 44 Komossa 44 Kuchner 44 Electron Microscope 44 LSST 44 interferometer 44 Lika Guhathakurta 44 spiral nebulae 44 nebular 44 linear Fresnel 44 THEMIS satellites 44 Viking Lander 44 polarimeter 44 detect gamma rays 44 Chartres cathedral 44 pallasite meteorite 44 submillimeter wavelength 44 WHIM 44 scanning tunneling microscopes 44 Mars rover Curiosity 44 TSN PZ camera 44 Adaptive Optics 44 NASA Cassini 44 optical wavelengths 44 moon Ganymede 44 Earthlike planets 44 X ray telescope 44 mammal fossils 44 RPWS 44 starburst galaxy 44 chambered nautilus 44 Quadrantids 44 microquasar 44 IceCube 44 Earthlike planet 44 twin STEREO spacecraft 44 Carina Nebula 44 NASA QuikScat satellite 44 Cassini imaging 44 Comet Lulin 44 Hubble telescope 44 eyepiece #/#s f/#.# 44 dynamical evolution 44 ammonite 44 Collider Detector 44 Fresnel lenses 44 photographic darkroom 44 spiral galaxy M# 44 SCIAMACHY 44 Noctilucent clouds 44 highly elliptical orbits 44 Onnes 44 Lyman alpha 44 Thierry Legault 44 robotically controlled 44 Carey Lisse 44 Earths crust 44 Cassini Image 44 outermost planet 44 Pierre Simon Laplace 44 Observatory 44 glows orange 44 Shoemaker Levy 44 Kip Thorne 44 Planetary Physics 44 Saturnian 44 gravitationally lensed 44 X ray microscopy 44 permanently shadowed craters 44 Curiosity rover 44 duckbill dinosaur 44 binocular telescope 44 Buhl Planetarium 44 lunettes 44 aperture telescope 44 PSR B# +# 44 pendant lamp 44 lensing galaxy 44 Anisotropy Probe WMAP 44 spectral fingerprints 44 ion microprobe 44 OGLE TR #b 44 Armagh Observatory 44 NASA Cosmic Background 44 beamline #.#.# 44 Tau Ceti 44 Adam Riess 44 Doppler Effect 44 Stardome 44 Io Europa Ganymede 44 Infrared Array Camera 44 Adler Planetarium 44 shadowy craters 44 CMB radiation 44 X ray computed tomography 44 geode 44 geomagnetism 44 NASA ESA Hubble 44 Fred Hoyle 44 Kensington Runestone 44 infrared spectral 44 albedo reflectivity 44 amoeba shaped 44 N. Rathnasree 44 glazed terra cotta 44 Saturn rings 44 Slipher 44 origins spectrograph 44 John Flamsteed 44 Cancri e 44 planetary transits 44 Celestron SkyScout 44 Magnetic Imager 44 Mauna Kea Hawaii 44 CFHT 44 constellation Pegasus 44 constellation Aquila 44 Wolf Rayet stars 44 Hubble Near Infrared 44 Mercury flyby 44 planet HD #b 44 Glaciologist 44 resolution panchromatic 44 deformable mirrors 44 ChemCam 44 mySKY 44 Martian meteorites 44 synchrotron X ray 44 Star Trek holodeck 44 Fornax 44 emission nebula 44 glowed brightly 44 Doppler measurements 44 concave mirror 44 crystallographer 44 X ray pulses 44 Siberian mammoth 44 waning gibbous 44 gamma ray astronomy 44 pinhole cameras 44 Fiske Planetarium 44 circumstellar 44 astronomical phenomena 44 Bromo Seltzer Tower 44 trilobite 44 planets orbits 44 particle physics experiments 44 sedimentologist 44 etcher 44 Francis Halzen 44 spectrograph 44 radial velocity 44 distant galaxy 44 wall hangings depicting 44 accelerator mass spectrometry 44 paleobotanist 44 Thermal Emission Spectrometer 44 Solar Terrestrial Relations 44 astrophysics 44 Cor Caroli 44 RY Sagittarii 44 starshade 44 planets constellations 44 Telescope 44 Axio Imager 44 VIRTIS 44 constellation Draco 44 spiral galaxy NGC 44 Paranal Observatory 44 comet Lulin 44 Cosmic Background Explorer