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(Click for frequent words.) 70 ESA XMM Newton 69 Fermi telescope 69 XMM Newton 68 AKARI 68 ESO VLT 67 X ray observatories 67 NASA Wilkinson Microwave 67 GALEX 66 gamma ray observatory 66 X ray observatory 66 CoRoT satellite 65 ray Space Telescope 65 Evolution Explorer 65 X ray telescopes 65 Planck satellite 64 Infrared Astronomical Satellite IRAS 64 Fermi LAT 64 RXTE 64 X ray spectrometer 64 NASA Far Ultraviolet 63 XMM Newton observations 63 distant quasar 63 multiwavelength 63 planetary Transits 63 WISE infrared 63 WMAP satellite 63 NASA Voyager spacecraft 62 microlensing events 62 Convection Rotation 62 orbiting Chandra 62 VIRTIS 62 ESA Planck 62 Galileo spacecraft 62 Planetary Transits 62 RS Ophiuchi 62 Hipparcos 62 UVOT 62 infrared telescopes 62 Anisotropy Probe WMAP 62 Comet Halley 62 ESA Envisat 62 distant quasars 62 neutron spectrometer 61 TerraSAR X 61 radiotelescope 61 Wilkinson Microwave Anisotropy Probe 61 RHESSI 61 submillimetre 61 UKIRT 61 SDSS II 61 blazars 61 transiting exoplanets 61 Planck telescope 61 Delta Cephei 61 ESO telescope 61 ESA Integral 61 VLTI 61 KamLAND 61 ESA Envisat satellite 61 GRB #A 61 ESO telescopes 61 fainter objects 60 ESA ERS 60 Telescope BAT 60 gamma ray detectors 60 gamma ray photons 60 Galaxy Evolution 60 gamma ray telescope 60 Area Telescope LAT 60 GRB# 60 infrared spectrometers 60 binary quasar 60 ENVISAT 60 Hubble Space Telescope HST 60 Reflection Radiometer 60 Fermi Gamma ray 60 Aqua satellite 60 HiRISE camera aboard 60 Digitized Sky Survey 60 Alpha Particle 60 spectrographic 60 infrared astronomy 60 TanDEM X 60 Explorer WISE 60 XMM Newton satellite 60 distant supernovae 60 elliptical galaxy NGC 60 HARPS instrument 60 Southern Observatory ESO 60 Mars Odyssey spacecraft 60 backscattered 60 gamma ray spectrometer 60 SOHO spacecraft 60 polarimetric 60 Imaging Spectrometer 60 Geminga 60 intrinsic brightness 59 NASA ESA Hubble 59 eclipsing binary 59 Active Galactic Nuclei 59 optical telescopes 59 Epsilon Eridani 59 spiral galaxy NGC 59 Ulysses spacecraft 59 RS Oph 59 Spectrograph 59 X ray afterglow 59 Fomalhaut b 59 Advanced Synthetic Aperture 59 Hinode spacecraft 59 Hubble Ultra 59 infrared telescope 59 Solar TErrestrial RElations Observatory 59 Spectrometer 59 Suzaku X ray 59 LOFAR 59 Multi Object Spectrometer 59 Hanny Voorwerp 59 ESO PR 59 Epsilon Aurigae 59 extragalactic 59 stellar occultation 59 Giovanni Cassini 59 Rosette Nebula 59 Keck Telescope 59 Mars Orbiter Camera 59 Moderate Resolution Imaging 59 interferometric 59 optical wavelengths 59 millisecond pulsar 59 Express orbiter 59 SN #A 59 AB Aurigae 59 COROT 59 exo planets 58 Milky Way halo 58 Keck telescope 58 Wilkinson Microwave Probe 58 brightest supernova 58 Cosmic Background Explorer 58 Infrared Astronomical Satellite 58 spatially resolved 58 infrared imager 58 infrared ultraviolet 58 ESA Herschel 58 Landsat satellites 58 astrophysical phenomena 58 Comet Holmes 58 exoplanet orbiting 58 ESO Paranal Observatory 58 IBEX spacecraft 58 Instrument OMI 58 Extragalactic 58 astrometric 58 G#.# +#.# 58 Optical Gravitational Lensing Experiment 58 NASA Cosmic Background 58 Rosetta orbiter 58 spectroscopic measurements 58 Nasa Kepler 58 Subaru Telescope 58 orbiting Hubble Space Telescope 58 Samuel Oschin Telescope 58 GRB #B 58 Orbiter LRO 58 Viking landers 58 orbiting gamma ray 58 Infrared Thermal Imaging Spectrometer 58 GRB # 58 VISTA telescope 58 Anisotropy Probe 58 Mossbauer 58 X ray Telescope XRT 58 Infrared Pathfinder Satellite 58 AATSR 58 Envisat satellites 58 SeaWiFS 58 Envisat Advanced Synthetic Aperture 58 galaxy M# [001] 58 coronagraph 58 NASA Lunar Prospector 58 imaging spectrometer 58 Great Observatories 58 Keck Interferometer 58 blazar 58 supernova SN 58 orbiting observatories 58 X ray emission 58 geoneutrinos 58 Moon Mineralogy Mapper M3 58 Cosmic Background Explorer COBE 57 reflection nebula 57 APXS 57 Mössbauer 57 stellar occultations 57 Triangulum Galaxy 57 National Astronomical Observatory 57 AU Mic 57 Super Kamiokande 57 muon neutrino 57 Multi Object Spectrograph 57 Envisat satellite 57 Voorwerp 57 Voyager spacecraft 57 Synthetic Aperture Radar 57 radiometry 57 Adaptive optics 57 microquasar 57 photometry 57 Shuttle Radar Topography 57 spectroscopic observations 57 galaxy M# [002] 57 Herschel telescope 57 Gamma ray 57 Nasa spacecraft 57 VLBI 57 SCIAMACHY 57 Butterfly Nebula 57 Orion Nebula 57 HESS telescopes 57 Hubble observations 57 exoplanetary 57 Very Large Array 57 gravitational microlensing 57 faint galaxies 57 Cosmic Microwave Background 57 Burst Alert 57 polarimetry 57 Supernova #A 57 Adaptive Optics 57 STEREO spacecraft 57 gamma ray telescopes 57 Kuiper belt objects 57 Bug Nebula 57 constellation Centaurus 57 astronomical telescope 57 Spitzer Space Telescope 57 Space Telescope 57 Spitzer infrared 57 Viking Lander 57 aboard ESA Envisat 57 Infrared Mapping Spectrometer VIMS 57 ESO Very Large Telescope 57 Orbiter MRO 57 situ measurements 57 Cloud Aerosol Lidar 57 smallest exoplanet 57 auroral emissions 57 Imaging Spectroradiometer MODIS instrument 57 Beta Pictoris b 57 INTEGRAL satellite 57 High Resolution Imaging 57 infrared spectra 56 Satellites GOES 56 KAGUYA 56 gravitationally lensed 56 Lyman alpha 56 neutrino experiments 56 HD# [002] 56 THEMIS satellites 56 Neutral Mass Spectrometer 56 proto galaxies 56 supergiant stars 56 Cat Paw Nebula 56 exoplanets orbiting 56 X ray Observatory 56 Composite Infrared Spectrometer 56 Cygnus Lyra region 56 Lunar Prospector 56 Observatory SDO 56 Nikku Madhusudhan 56 VIRTIS instrument 56 spectral measurements 56 ESA Cluster 56 SNR #-#.# 56 millimeter wavelengths 56 Trifid Nebula 56 2MASS 56 rocky extrasolar planet 56 earthshine 56 interferograms 56 Interferometer 56 muon neutrinos 56 airborne observatory 56 WFC3 56 Lunar Orbiter 56 HiRISE camera 56 NASA MODIS satellite 56 Beta Pictoris 56 active galactic nucleus 56 Siding Spring 56 photoelectron 56 gamma ray flares 56 microlensing 56 gamma ray emission 56 La Silla Observatory 56 orbiter Mars Odyssey 56 Subaru telescope 56 Elenin 56 NASA CloudSat 56 spectroscopically 56 type Ia supernova 56 spectro 56 RRATs 56 TRMM satellite 56 spectrographs 56 radial velocity measurements 56 Heliospheric Observatory SOHO 56 HUDF 56 interferometers 56 STIS 56 wavebands 56 NASA Chandra 56 INTEGRAL 56 DISR 56 Radiation Dose Monitor 56 Ozone Monitoring 56 airglow 56 distant galaxy clusters 56 spectroscope 56 e MERLIN 56 electron diffraction 56 MicroFUN 56 radiometers 56 submillimetre wavelengths 56 Surveys ACS 56 SuperWASP 56 MG J# +# 56 Sounder AIRS instrument 56 photometer 56 supernova remnant 56 Ray Spectrometer 56 X ray binary 56 Tarantula Nebula 56 telescopic observations 55 Earth orbiting satellites 55 LOFAR telescope 55 Lunar Reconnaissance Orbiter LRO 55 infrared observatory 55 Descent Imager Spectral Radiometer 55 starburst galaxy 55 constellation Eridanus 55 Faint Object 55 NOAA GOES 55 HARPS spectrograph attached 55 diffraction patterns 55 Upsilon Andromedae 55 infrared wavelength 55 Mini SAR 55 Mini TES 55 astrometry 55 absorption spectra 55 detect gamma rays 55 NASA THEMIS 55 giant elliptical galaxy 55 infrared wavelengths 55 globular cluster M# 55 Radioastronomy 55 synchrotron radiation 55 Very Large Telescope 55 AERONET 55 Laser Interferometer Gravitational Wave 55 Mars landers 55 afterglows 55 NASA MODIS 55 infrared interferometry 55 nebular 55 SIRTF 55 GROND 55 NASA STEREO 55 optical interferometry 55 Mossbauer spectrometer 55 Infrared Array Camera 55 active galactic nuclei 55 SEGUE 55 spacecraft orbiting 55 Interferometer VLTI 55 VHE gamma rays 55 Nasa Mars Reconnaissance 55 hyperspectral imager 55 galactic disk 55 X ray wavelengths 55 Ultraviolet Optical Telescope 55 martian meteorites 55 SINFONI 55 Landsat satellite 55 Helix Nebula 55 HM Cancri 55 infrared spectrograph 55 Cassini spacecraft orbiting 55 spaceborne 55 VLBA 55 Pancam 55 ASTRON 55 Explorer GALEX 55 Mars Pathfinder lander 55 Cherenkov 55 TrES 4 55 Fermi Telescope 55 ultraviolet wavelengths 55 NASA EPOXI mission 55 luminous galaxies 55 Meteosat 55 Moon Mineralogy Mapper 55 protoplanetary 55 Borexino 55 NuSTAR 55 WISE spacecraft 55 OGLE TR #b 55 Observatory Very 55 THEMIS spacecraft 55 submillimeter wavelengths 55 Climate Experiment GRACE 55 Comet 9P/Tempel 1 55 Mars Orbiter 55 Solar Optical Telescope 55 BESSY II 55 electric ion propulsion 55 GEO# 55 NASA Interstellar Boundary 55 correlator 55 SN #C 55 spectroscopic analysis 55 energetic electrons 55 dust enshrouded 55 polar mesospheric clouds 55 Relations Observatory STEREO 55 interferometric observations 55 gravitational wave 55 orbiter Cassini 55 electron neutrinos 55 proto cluster 55 Long Baseline Interferometry 55 Stephan Quintet 55 WFPC2 55 astronomers 55 proton antiproton collisions 55 Interferometric 55 type Ia supernovae 55 DEM L# 55 Neutron Detector 55 twin STEREO spacecraft 55 AGNs 55 Cosmic Microwave Background CMB 55 Earthlike planets 55 Rosetta comet chaser 55 Lulin 55 WMAP 55 BLG #Lb 55 Kepler spacecraft 55 exo planet 55 Mars orbiting spacecraft 54 Coma Cluster 54 planets orbiting sun 54 extrasolar planets orbiting 54 Spectroscopic Explorer 54 TerraSAR X satellite 54 X ray telescope 54 occultations 54 Carina constellation 54 KBOs 54 visible wavelengths 54 radial velocity 54 constellation Carina 54 polar orbiting satellites 54 EVLA 54 Mars Reconnaissance Orbiter MRO 54 NASA Landsat 54 IR wavelengths 54 Uninhabited Aerial Vehicle 54 extrasolar 54 cosmic cannibal 54 submillimeter 54 Near Infrared Camera 54 Proxima Centauri 54 chondritic meteorites 54 Thermal Emission 54 radial velocity technique 54 SNe 54 HRSC 54 German SAR Lupe 54 WISE telescope 54 Wide Angle Search 54 millisecond pulsars 54 laser altimeter 54 Spitzer infrared spectrograph 54 distant supernovas 54 lensing galaxy 54 Interferometric Synthetic Aperture Radar 54 gamma ray 54 trans Neptunian objects 54 orbiting telescopes 54 Dwarf galaxies 54 Miniature Thermal Emission 54 EarthCARE 54 Hubble Telescope 54 J# +# [002] 54 SIRAL 54 Synthetic Aperture Radar SAR 54 X ray pulses 54 Metop 54 SNfactory 54 DEIMOS 54 circumstellar 54 INMS 54 Crab Nebula 54 spectroscopic 54 Heterodyne Instrument 54 Mpc 54 Saturn outermost ring 54 Thermal Emission Spectrometer 54 Tropical Rainfall Measuring 54 radio occultation 54 MPIfR 54 infrared spectral 54 protostars 54 GOCE satellite 54 Radar ASAR 54 GRBs 54 Large Array 54 magnetars 54 redshift 54 Helioseismic 54 J#.# [001] 54 magnetar 54 Viking orbiters 54 NASA Cassini 54 Infrared Telescope 54 Transmission Electron Microscope 54 SPICAM 54 NASA WMAP 54 VLBA observations 54 NFIRE satellite 54 Optical Spectroscopic 54 Japan NAOJ 54 La Silla observatory 54 Herschel Space Telescope 54 sunlike stars 54 Orion nebula 54 Mission SRTM 54 NASA Fermi Gamma 54 Compact Reconnaissance Imaging Spectrometer 54 Kepler Mission 54 hyper spectral 54 Total Ozone Mapping 54 TNOs 54 Submillimeter 54 fluorescence microscope 54 galaxy NGC 54 SN #D 54 astronomical observatories 54 MERIS 54 orbiting Hubble telescope 54 Resolution Imaging Spectrometer 54 Astrophysical Research 54 bolometers 54 Crab Pulsar 54 Infrared Astronomy 54 exoplanets planets 54 Igor Chekalin 54 NASA Kepler 54 tau neutrino 54 Magnetospheric 54 Great Observatories Origins 54 LORRI 54 Chandra Observatory 54 Earth Observation satellites 54 weak gravitational lensing 54 Field Imager 54 Mini Thermal Emission 54 Solar Orbiter 54 sunlike star 54 V# Mon 54 Seyfert galaxies 53 Aurigae 53 Planck spacecraft 53 P/# A2 53 spacecraft flyby 53 SDSS 53 spacecraft orbited 53 Cosmic Origins Spectrograph COS 53 NASA QuikScat satellite 53 Astrophysics MOA 53 Synthetic Aperture 53 VIMOS 53 Herschel Space 53 Spectroscopic 53 #x magnification [002] 53 Bullet Cluster 53 ESA Rosetta 53 Red Rectangle 53 GIOVE B 53 Antennae Galaxies 53 NGC# 53 spectrometric 53 Observatory STEREO 53 reionization 53 NEOWISE 53 Context Camera 53 antineutrinos 53 Submillimeter Array 53 Facility SIRTF 53 Free Electron Laser 53 interferometry 53 redshifts 53 WM Keck Observatory 53 Galactic cosmic rays 53 sub millimeter wavelengths 53 Voyager probes 53 Gerard Kuiper 53 Neutron Spectrometer 53 UCO Lick 53 cosmic ray particles 53 astronomical observations 53 jovian 53 gravitational radiation 53 Fornax cluster 53 XMM Newton observatory 53 Auger Observatory 53 SAR Lupe 53 Mars Color Imager 53 radiometer 53 neutral mass spectrometer 53 gravitational lenses 53 CoRoT 9b 53 Ring Nebula 53 X ray binaries 53 brightnesses 53 constellation Aquila 53 starburst galaxies 53 orbiting Mars 53 visit http:/saturn.jpl.nasa.gov 53 transiting planets 53 NASA Stratospheric Observatory 53 Wolszczan 53 Cassini flyby 53 HRTEM 53 radioisotope thermoelectric generators 53 XMM Newton X ray 53 novae 53 APEX telescope 53 Small Magellanic Cloud 53 CFHT 53 Clementine spacecraft 53 supergiant star 53 gaseous planet 53 NASA ICESat 53 e VLBI 53 gamma rays emitted 53 millimeter wavelength 53 Ocean Salinity SMOS 53 ionized hydrogen 53 barred spiral galaxy 53 ESA SMART 53 OGLE TR 53 shortwave infrared 53 fluorescence spectroscopy 53 HUDF# 53 NASA Cassini spacecraft 53 photometric 53 filamentary structure 53 gamma ray burst GRB 53 Rosetta spacecraft 53 George Djorgovski 53 distant galaxies 53 HiRISE image 53 moon Io 53 planets orbiting distant 53 spacecraft Cassini 53 THEMIS mission 53 Lunar CRater Observation 53 Deep Field HUDF 53 UVIS 53 Advanced Spaceborne Thermal Emission 53 distant galaxy 53 gamma ray radiation 53 X ray spectra 53 Advanced LIGO 53 Satellite GOES 53 HD#b 53 radar altimeters 53 Cosmic Evolution 53 Magnetic Imager HMI 53 submillimeter wavelength 53 galaxy redshift 53 Muchachos Observatory 53 solar corona 53 Anthony Remijan 53 NICMOS 53 Suzaku 53 Kuiper Belt Objects 53 KH #D 53 metallicity 53 spiral nebulae 53 Antenna LISA 53 interferometric technique 53 wavelength infrared 53 Planck observatory 53 Krimigis 53 EPOCh 53 SMM J# 53 Infrared Astronomy SOFIA 53 neutrino detectors 53 gamma rays 53 Gamma Ray 53 proton proton collisions 53 Fermi Large 53 Planetary Camera 2 53 elliptical galaxies 53 neutron radiation 53 interferogram 53 LRO spacecraft 53 Helios 2B 53 Spectroradiometer MODIS 53 Cometary 52 hyperspectral sensors 52 Phased array 52 interstellar particles 52 Astro E2 52 lunar equator 52 Gliese #e 52 Comet Lulin 52 masers 52 azimuthal 52 JDEM 52 Space Telescope GLAST 52 Meteorological Satellites 52 geosynchronous satellites 52 Fourier transform infrared FTIR 52 unmanned probes 52 Alycia Weinberger 52 mu Arae 52 NASA Tropical Rainfall 52 retroreflector 52 Io Europa 52 galactic clusters 52 Saturn Cassini 52 lightwaves 52 Virgo Cluster 52 Exoplanets 52 XTE J# 52 volcanic moon Io 52 synchrotron X ray 52 thermal infrared 52 photoluminescence 52 gamma ray burst 52 NEAR Shoemaker 52 CERN LHC 52 CoRoT 52 JWST 52 Array ALMA 52 Resolution Instrument 52 UDFy # 52 Lunar Reconnaissance Orbiter Camera 52 CALIPSO 52 Paranal Chile 52 NASA Stardust spacecraft 52 energy dispersive X 52 astrophysical objects 52 Type Ia supernovae 52 OMEGA instrument 52 Aram Chaos 52 meteoritic material 52 cosmic ray 52 X ray Telescope 52 Galactic Plane 52 reconnaissance satellites 52 CAIs 52 Atmospheric Infrared Sounder 52 lunar orbiters 52 neutron detector 52 lobate scarps 52 moon Mab 52 Hipparchus 52 infrared 52 planets circling 52 Comet Hartley 2 52 photoemission 52 Andromeda Galaxy 52 UVIS instrument 52 Omega Centauri 52 Cassini Huygens spacecraft 52 Lagoon Nebula 52 constellation Cassiopeia 52 moons Phobos 52 Using ESO Very 52 interferometer 52 AVHRR 52 EADS Astrium GmbH 52 planet Uranus 52 red supergiants 52 Charon Pluto 52 Energy Stereoscopic 52 interferometric synthetic aperture radar 52 inch Samuel Oschin 52 micron wavelengths 52 Nuclear Spectroscopic Telescope Array 52 supernova remnants 52 ESO astronomer 52 constellation Aquarius 52 spectra 52 powder diffraction 52 Higgs bosons 52 optical telescope 52 Explorer IBEX 52 ESO La Silla 52 Pan STARRS 52 UVES 52 extrasolar planet 52 Rosetta lander 52 Hinode satellite 52 SPIRE instrument 52 Cartosat 2A 52 quasars 52 interplanetary spacecraft 52 Orion constellation 52 QWIP 52 planetary nebulae 52 circumstellar disks 52 Miniature Synthetic Aperture Radar 52 AAVSO 52 Kuiper Belt Object 52 XENON# [002] 52 GOES satellites 52 Kepler Space Telescope 52 Raman spectra 52 Tod Strohmayer 52 IKONOS 52 Eta Carinae 52 VY Canis Majoris 52 Australian SKA Pathfinder 52 Foton M3 52 outermost planets 52 fluorescence detector 52 IKAROS 52 planetary transits 52 Mission TRMM satellite 52 hexagonal mirrors 52 asteroid Steins 52 radar altimeter 52 NASA Kepler spacecraft 52 S/# [001] 52 Global Surveyor spacecraft 52 Gemini telescopes 52 Mars moon Phobos 52 star Gliese 52 Solar Terrestrial Relations 52 synthetic aperture 52 astronomical objects 52 CMB radiation 52 Halton Arp 52 synthetic aperture radar 52 HL Tau 52 monochromators 52 Scorpii 52 Keck telescopes 52 Saturn aurora 52 Andromeda galaxy 52 Pluto Charon 52 SDSS III 52 Ikonos 52 HARPS spectrograph 52 Solar Dynamics Observatory 52 constellation Virgo 52 ESA Mars 52 radiosondes 52 Credits ESA 52 Galilean moons 52 reflectometry 52 Geosynchronous 52 Globular Cluster 52 Chandra X ray 52 AMSR E 52 particle detectors 52 comet Lulin 52 constellation Ursa Major 52 NIRSpec 52 Advanced Microwave Scanning 52 Exoplanet 52 protoplanetary disks 52 Remote sensing 52 Moessbauer 52 Andromeda halo 52 multibeam 52 Spitzer Infrared Array 52 MARSIS 52 X ray Spectrometer 52 D CIXS 52 MODIS 52 fading afterglow 52 zodiacal light 52 photoelectron spectroscopy 52 accretion disks 52 orbiting spacecraft 52 Far Ultraviolet Spectroscopic Explorer 52 PSR J# 52 tau neutrinos 52 SN #gy 52 Robotic Arm Camera 52 Sagittarius B2 52 ultrahigh resolution 52 HIRES spectrometer 52 spectral characteristics 52 Supernova Cosmology Project 52 Cassini Huygens 52 blue supergiant 52 Large Electron Positron 51 meteorological satellites 51 THEMIS 51 Heliospheric Observatory 51 C1XS 51 lunar meteorites 51 Martian rovers 51 NASA Atmospheric Infrared 51 Jenniskens 51 arcminutes 51 Konacki 51 axions 51 comet McNaught 51 superheavy element 51 luminosities 51 Radar ASAR instrument 51 Kailash Sahu 51 constellation Taurus 51 altimetry 51 Fornax 51 neutron beams 51 gradiometer 51 Type Ia supernova 51 Photoacoustic 51 GJ #b [001] 51 particle physics experiments 51 Shoemaker Levy 51 radar altimetry 51 star Beta Pictoris 51 La Silla Chile 51 GOCE 51 circumstellar disk 51 dynamical evolution 51 CARTOSAT 2A 51 optical spectra 51 Calar Alto Observatory 51 interacting galaxies 51 Lunar Orbiter Laser Altimeter 51 tomograph 51 PSR B# 51 Extrasolar planets 51 STScI 51 CRISM 51 Normalized Difference Vegetation 51 cosmic ray observatory 51 radial velocity method 51 Envisat 51 keV 51 methyl cyanide 51 spectral fingerprint 51 noctilucent 51 Eridani 51 NASA Gamma ray 51 extrasolar planetary 51 hyperspectral 51 UAVSAR 51 Infrared Mapping Spectrometer 51 widefield 51 Imaging Spectroradiometer MODIS 51 TRMM 51 Planetary Fourier Spectrometer PFS 51 Oganessian 51 SMOS 51 proplyds 51 infrared satellite imagery 51 Lunar Laser Ranging 51 Grillmair 51 electron positron 51 exosphere 51 interstellar dust clouds 51 globulars 51 Mauna Kea Hawaii 51 cosmological distances 51 Virgo cluster 51 polar orbiting 51 GOSAT 51 radar interferometry 51 Henize #-# 51 Trojan asteroids 51 ALMA antennas 51 radiosonde 51 dwarf spheroidal galaxies 51 Pleiades cluster 51 Doppler velocity 51 NFIRE 51 Churyumov Gerasimenko 51 Cherenkov radiation 51 exhaust plume 51 Veil Nebula 51 infrared spectrums 51 LAGEOS 51 proton antiproton 51 Imaging Spectrometer MERIS