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(Click for frequent words.) 62 Spectrograph 59 VLT telescope 59 ESO VLT 58 ESO telescope 58 CFHT 58 submillimetre 58 Anisotropy Probe 57 Extragalactic 57 Imaging Spectrometer 57 CSIRO Parkes radio 56 NOAO 56 Credits ESA 56 La Silla Observatory 56 NOAO AURA NSF 56 Total Ozone Mapping 56 Interferometric 55 La Silla observatory 55 Observatory NOAO 55 WIYN 55 MPIfR 55 KIPAC 55 Multi Object Spectrometer 54 HARPS spectrograph attached 54 ESO La Silla 54 NASA Wilkinson Microwave 54 Cerro Tololo 54 Spectroscopic 54 Planetary Transits 54 Infrared Telescope Facility 54 Paranal Chile 54 Geophys 54 Leiden Observatory 54 Interferometer 54 Astrophysical 54 Astronomie 53 interferometric observations 53 ESA XMM Newton 53 Max Planck Institut für 53 SEGUE 53 Mauna Kea Hawaii 53 Anisotropy Probe WMAP 53 Observatoire de Paris 53 Submillimeter 53 APEX telescope 52 La Silla 52 Thermal Emission 52 Nikon D# Kowa 52 Magnetospheric 52 polarimetry 52 Fermi Gamma ray 52 Wolfgang Brandner 52 Beamline 52 STScI 52 Cosmic Background Explorer COBE 52 TSN PZ camera 52 X ray spectrometer 52 LOFAR 52 2MASS 52 Radioastronomy 52 Optical Telescope 52 Instrument OMI 52 Astronomy Observatory 52 THEMIS Image 52 Convection Rotation 52 Electron Microscope 52 geomagnetism 52 Earthscope 52 William Herschel Telescope 52 D CIXS 52 NIRCam 51 GALEX 51 ASTRON 51 Max Planck Institut fuer 51 orbiting gamma ray 51 Anisotropy 51 Telescope LSST 51 polarimeter 51 Gemini telescopes 51 telescope atop Mauna 51 AAVSO 51 Mission SRTM 51 Triangulum Galaxy 51 VLBI 51 Active Galactic Nuclei 51 Planetology 51 SDSS II 51 NASA Far Ultraviolet 51 Gemini Observatory 51 UVOT 51 Multi Object Spectrograph 51 Wilkinson Microwave Probe 51 Keck telescopes 51 interferometric 51 Southern Observatory ESO 51 XMM Newton satellite 51 Wilkinson Microwave Anisotropy Probe 51 Compact Array 51 Spatiale des 51 JCMT 51 spectroscopic measurements 50 ASCAT 50 Astrophysical Research 50 Moon Mineralogy Mapper M3 50 imaging spectrometer 50 Hubble Space Telescope HST 50 CfA 50 Cosmic Evolution 50 Spectrometry 50 inch Samuel Oschin 50 eyepiece #/#s f/#.# 50 Cerro Pachón 50 Muchachos Observatory 50 National Optical Astronomy 50 e MERLIN 50 Descent Imager Spectral Radiometer 50 Credit NASA JPL 50 NASA Landsat 50 Submillimeter Array 50 Large Telescope 50 Geostationary 50 X ray Telescope XRT 50 Mössbauer 50 Peter Jenniskens 50 eclipsing binary 50 Observatoire de Haute Provence 50 astrometric 50 Orbiter spacecraft 50 ESA Envisat 50 Astrophysicist 50 INTEGRAL 50 NASA MODIS 50 Image NASA JPL 50 NRAO AUI NSF 50 ESO Very Large Telescope 49 Spectrometers 49 ENVISAT 49 EUTELSAT 49 Photoacoustic 49 Infrared Thermal Imaging Spectrometer 49 Herschel Space 49 Space Telescopes 49 Cerro Paranal 49 Photometric 49 Observatory Very 49 Ionosphere 49 NOAA GOES 49 Cassini ion 49 Chajnantor 49 Area Telescope LAT 49 Mount Stromlo Observatory 49 Don Gurnett 49 radiometers 49 Infrared Camera 49 XMM Newton 49 Keck Interferometer 49 Astronomical Observatory 49 ESO Paranal Observatory 49 Near Infrared 49 Keck telescope 49 Hubble Near Infrared 49 HiRISE camera aboard 49 Lunar Laser Ranging 49 Ionospheric 49 Mini SAR 49 NASA Infrared Telescope 49 ESA SMART 49 Chajnantor plateau 49 Digitized Sky Survey 49 Las Campanas Observatory 49 ESA ERS 49 Subaru Telescope 49 infrared astronomy 49 resolution panchromatic 49 Observatories 49 Exoplanet 49 NASA JPL Caltech 49 ASKAP 49 Relativistic 49 spectroscopic observations 49 Cerro Pachon 49 Mini Thermal Emission 49 Camelopardalis 49 weak gravitational lensing 49 distant quasar 48 UA Steward Observatory 48 Ranging MESSENGER spacecraft 48 MPG ESO 48 Fundamental Physics 48 EPOCh 48 HD# [002] 48 Max Planck Institut fur 48 Multibeam 48 polarimetric 48 Effelsberg 48 UKIRT 48 HARPS instrument 48 DEEP2 48 LINEAR 48 Fermi telescope 48 detect gamma rays 48 Microlensing 48 gamma ray observatory 48 Manchester Jodrell Bank 48 ESA Integral 48 radar altimetry 48 Calar Alto Observatory 48 Oscillations 48 HUDF 48 Telescope Array 48 Atacama Large Millimeter Array 48 Long Wavelength Array 48 SRON 48 Main Injector Neutrino 48 VISTA telescope 48 twin STEREO spacecraft 48 ESA Herschel 48 Brillouin 48 de Pater 48 ESA Proba 48 VLBA 48 Infrared Array Camera 48 SOAR telescope 48 infrared interferometry 48 Gamma ray Burst 48 Optical Gravitational Lensing Experiment 48 Keck Telescope 48 XMM Newton X ray 48 ESA Planck 48 spectral characteristics 48 neutron spectrometer 48 Spectrometer 48 ROSAT 48 Adaptive Optics 48 VIRTIS 48 Institut d' Astrophysique de 48 Neutral Mass Spectrometer 48 Imaging Spectrograph 48 NASA GSFC 48 magnetotelluric 48 WMAP satellite 48 GRB# 48 X ray telescopes 48 Siding Spring 48 NASA WMAP 48 Instituto de Astrofisica de 48 spectro 48 ESA Cluster 48 AKARI 48 Near Infrared Camera 48 Field Imager 47 Ultrafast 47 Microlensing Observations 47 Surveys ACS 47 Moderate Resolution Imaging 47 Roque de los 47 distant quasars 47 WM Keck Observatory 47 Extrasolar Planets 47 EVLA 47 Observatory SDO 47 Cosmic Background Explorer 47 X ray observatory 47 Planetary Science Institute 47 Planetary Scientist 47 MMT Observatory 47 Steward Observatory 47 arcminutes 47 Ocean Salinity SMOS 47 RHESSI 47 NASA CloudSat 47 Observatory STEREO 47 radiotelescope 47 Observatory astronomer 47 planetary Transits 47 Thermal Emission Spectrometer 47 Lyot 47 Gemini Telescope 47 wavelength infrared 47 RPWS 47 Helioseismic 47 panchromatic 47 interferometer 47 Alpha Particle 47 COROT 47 Paranal Observatory 47 Telescope 47 InSAR 47 Laser Scanning 47 Suzaku X ray 47 Aqua satellite 47 NICMOS 47 JPL Caltech 47 Hyakutake 47 interferometry 47 mT 47 Smos 47 Foing 47 Faulkes Telescope 47 Rolf Kudritzki 47 Chamaeleon 47 Synthetic Aperture 47 Landsat satellite 47 Reflection Radiometer 47 Observatory La Silla 47 CoRoT 47 Astrophysical Institute 47 ESO PR 47 submillimeter wavelength 47 ASPERA 47 FUV 47 Magnetosphere 47 Atacama Large Millimeter submillimeter 47 Interferometer VLTI 47 pixel CMOS 47 La Silla Chile 47 velocity Planet Searcher 47 WIYN telescope 47 Fermi LAT 47 Crab Pulsar 47 Array ALMA 47 Cerro Tololo Inter 47 Exoplanets 47 Cygnus Lyra region 47 Spacewatch 47 Synthetic Aperture Radar 47 Stratigraphy 46 Katzman Automatic 46 Cerro Armazones 46 Nasa Mars Reconnaissance 46 stellar occultations 46 SuperWASP 46 Dan Durda 46 meter Keck telescopes 46 Postdoctoral Researcher 46 Light Scattering 46 Rosetta orbiter 46 Atmospheric Physics 46 Reflection Radiometer ASTER 46 interferometers 46 Solar Radiation 46 Kepler Mission 46 X ray observatories 46 SES WORLD SKIES NSS 46 Lunar Reconnaissance Orbiter Camera 46 aboard ESA Envisat 46 NAOJ 46 Spectroradiometer 46 Relations Observatory STEREO 46 multibeam 46 Ulysses spacecraft 46 Cassini Image 46 Advanced Microwave Scanning 46 Telescope BAT 46 airglow 46 Paranal 46 Pancam 46 ESO telescopes 46 barred spiral galaxy 46 UK DMC2 46 Geochemistry 46 solar corona 46 ChemCam 46 ATLAS experiment 46 Astronomer 46 LIGO Scientific Collaboration 46 X ray Spectrometer 46 OGLE 46 Infrared Pathfinder Satellite 46 NRAO 46 Mid Infrared 46 Alaska Fairbanks Geophysical 46 Lunar Crater 46 Heinrich Hertz 46 Richard Mushotzky 46 SAAO 46 Energy Stereoscopic 46 Atmospheric Radiation 46 Orbiter LRO 46 DEIMOS 46 SeaWiFS 46 geochronology 46 Sky Survey SDSS 46 Space Physics 46 Landsat imagery 46 telescopes atop Mauna 46 millimeter wavelengths 46 Planck satellite 46 ASTER 46 Institut Laue Langevin 46 Molecular Evolution 46 orbiting Chandra 46 telescopic observations 46 Centre d' Etude 46 CARTOSAT 2A 46 J# +# [002] 46 CEA Saclay 46 Habitable Worlds 46 optical telescope 46 Infrared Telescope 46 National Astronomical Observatory 46 Interferometry 46 Ozone Monitoring 46 Keck Observatory 46 Orbiter MRO 46 optical wavelengths 46 Phased Array 46 High Angular Resolution 45 Heliophysics 45 arcsec 45 astrometry 45 Envisat satellite 45 Geoscience Laser Altimeter 45 GFZ 45 RXTE 45 extrasolar planetary systems 45 SPIRE instrument 45 Volcanologist 45 Lyman alpha 45 Gamma ray 45 Astrophysics MOA 45 Explorer WISE 45 Large Telescope Salt 45 UCO Lick 45 Mossbauer 45 Muséum National 45 Gamburtsev 45 Michael Studinger 45 spectrographs 45 Nima Arkani Hamed 45 spiral galaxy NGC 45 Wide Angle Search 45 Solar Observatory 45 Boston Micromachines 45 Grenoble Observatory 45 radio occultation 45 SCIAMACHY 45 astronomy observatory 45 S/# [001] 45 Meteoritics 45 Mission TRMM 45 INAF IASF 45 SIRAL 45 Cloud Aerosol Lidar 45 IKONOS Satellite 45 INTEGRAL satellite 45 NASA Chandra 45 Dosimetry 45 Morphology 45 Herschel SPIRE 45 Jeffrey Kargel 45 Diffraction 45 Terrestrial Ecology 45 LAGEOS 45 Cassini flyby 45 submillimetre wavelengths 45 redshift 45 Scripps Oceanography 45 Lagoon Nebula 45 Composite Infrared Spectrometer 45 planetary astronomer 45 Spaceweather.com 45 UAVSAR 45 Plate Boundary 45 Andromeda Galaxy M# 45 Francis Halzen 45 Petrology 45 supernova SN 45 Planetary Exploration 45 EarthCARE 45 Observatoire de la 45 VIMOS 45 HW2 45 ESO 45 LIGO 45 exo planet 45 NASA THEMIS 45 THEMIS 45 rover panoramic 45 Physique du Globe 45 infrared spectra 45 inch refractor telescope 45 neutrino detector 45 Aeronomy 45 gamma ray spectrometer 45 CHARA 45 Focal Plane 45 UC Observatories Lick 45 Impactor 45 Rainer Klement 45 Kepler 9b 45 Ritchey Chrétien 45 Synchrotron Radiation 45 Gamma Ray 45 Herschel telescope 45 SINFONI 44 spectrographic 44 Infrared Telescope UKIRT 44 AU Mic 44 Instituto Nacional de Pesquisas 44 cosmic ray observatory 44 Ray Spectrometer 44 Advanced Composition 44 beamline 44 auroral 44 Catherine Cesarsky 44 Japan NAOJ 44 Andrea Ghez 44 reflectometer 44 CALIPSO satellites 44 E ELT 44 Explorer GALEX 44 infrared mapping spectrometer 44 Max Plank 44 LTER 44 microlensing 44 GeoSciences 44 Observatory telescope 44 HESS telescopes 44 Optus D1 44 TU# [002] 44 Fermi Telescope 44 multispectral 44 Solar TErrestrial RElations Observatory 44 Caltech astronomer 44 Peter Capak 44 ray Space Telescope 44 luminous galaxies 44 ultraviolet wavelength 44 Hubble astronomer 44 Virtual Planetary Laboratory 44 Long Baseline Array 44 Lunar Orbiter Laser Altimeter 44 RY Sagittarii 44 Space Telescope 44 Mars Color Imager 44 spectroradiometer 44 Saul Perlmutter 44 rocky extrasolar planet 44 Nial Tanvir 44 NASA Cosmic Background 44 Scanning Electron Microscopy 44 tropospheric 44 X ray Telescope 44 BLG #Lb 44 radiometer 44 NASA Atmospheric Infrared 44 optical infrared telescope 44 Electrophysiological 44 RS Ophiuchi 44 Observatory LIGO 44 gamma ray telescope 44 Keck Telescopes 44 Pascale Ehrenfreund 44 DigitalGlobe WorldView 2 44 spectrometer 44 microlensing events 44 Subaru telescope 44 Genetics Laboratory 44 hyperspectral imager 44 Io Europa 44 altimetry 44 Uninhabited Aerial Vehicle 44 ESA Envisat satellite 44 Infrared Astronomical Satellite IRAS 44 SN #A 44 Heterodyne Instrument 44 synthetic aperture 44 exoplanetary 44 Hobby Eberly Telescope 44 martian meteorites 44 constellation Carina 44 SPIRE 44 Hubble Captures 44 Spitzer Infrared Array 44 WM Keck 44 Veil Nebula 44 TerraSAR X 44 Lulin Observatory 44 Carnegie Observatories 44 SMOS Soil Moisture 44 Radar Altimeter 44 Garching Germany 44 adaptive optics 44 WFPC2 44 vegetation greenness 44 thermopile 44 AMIE camera 44 Gerhard Neukum 44 Deep Impact Principal Investigator 44 SECCHI 44 Space Telescope GLAST 44 Electron Microscopy 44 Laser Interferometer Space 44 Astronomy 44 Magellan telescopes 44 Hawaii Mauna Kea 44 Solar Dynamics Observatory 44 Nankai Trough Zone 44 detect gravitational waves 44 NASA Fermi Gamma 44 Large Telescope SALT 44 GLAST Burst Monitor 44 Remote Sensing Laboratory 44 VIRTIS instrument 44 Astrophysics Laboratory 44 monochromators 44 waning gibbous 44 gamma ray detector 44 CCLRC Rutherford Appleton 43 Long Baseline Interferometry 43 Earth orbiting satellites 43 FORMOSAT 43 located atop Mauna 43 thermal infrared 43 submillimeter 43 ESRF 43 Geminga 43 Very Large Array 43 Moon Mineralogy Mapper 43 Faint Object 43 Extreme Ultraviolet Imaging Spectrometer 43 Theodor Hänsch 43 ultrahigh resolution 43 Cassini Ion 43 Large Array 43 Dumbbell Nebula 43 Pierre Drossart 43 Harlow Shapley 43 Electromagnetics 43 millisecond pulsar 43 parabolic antenna 43 photometry 43 Solar Orbiter 43 laser altimeter 43 MINOS 43 INMS 43 galaxy M# [001] 43 ESA Rosetta 43 SRON Netherlands Institute 43 Pierre Simon Laplace 43 sedimentary geology 43 -Wauk 43 theoretical astrophysicist 43 Anik F2 43 GMRT 43 Very Large Telescope 43 Surface Temperature 43 Satellite Successfully Launched 43 Decadal 43 TanDEM X 43 Spectroscopy 43 Antenna LISA 43 CIRES 43 gravitational microlensing 43 photometer 43 optical telescopes 43 CALIPSO 43 Samuel Oschin Telescope 43 Meteorite Studies 43 ACS WFC 43 USArray 43 Extraterrestrial Physics 43 Franck Marchis 43 Katlenburg Lindau Germany 43 Palaeontology 43 Resurs 43 Hawaii Telescope CFHT 43 LROC 43 ionospheric 43 SIM PlanetQuest 43 Mauna Loa Observatory 43 exoplanet hunter 43 NASA QuikScat satellite 43 Induced Polarisation 43 Elenin 43 Advanced Spaceborne Thermal Emission 43 Helix Nebula 43 Velocity Planet Searcher 43 Tauri 43 Multiscale 43 Giovanna Tinetti 43 Wilfried Haeberli 43 robotic telescopes 43 Volker Bromm 43 Chilbolton 43 constellations Cygnus 43 High Altitude Observatory 43 Astroparticle Physics 43 Aeromagnetic 43 e VLBI 43 Laser Interferometer Gravitational Wave 43 Polarimetry 43 Large Binocular Telescope LBT 43 X ray wavelengths 43 GRB #B 43 MIT Haystack Observatory 43 ICESat 43 Subglacial 43 Perseus Cluster 43 visit http:/saturn.jpl.nasa.gov 43 Confirms Significant 43 Terrestrial Magnetism 43 infrared spectrograph 43 NASA Interstellar Boundary 43 NuSTAR 43 Antennae 43 Measuring Mission TRMM 43 Reinhard Genzel 43 Electromagnetism 43 Pan STARRS telescope 43 Envisat satellites 43 SDSS III 43 NASA Cassini 43 Heliospheric Observatory SOHO 43 Synchrotron 43 SkyCenter 43 CMB radiation 43 ultraviolet spectrograph 43 Gran Telescopio Canarias 43 arcseconds 43 Express orbiter 43 VLTI 43 Mars CRISM 43 Solar Terrestrial 43 SMOS 43 PlanetQuest 43 aperture telescope 43 Las Cumbres Observatory 43 Auroral 43 Rychard Bouwens 43 Energy Solar Spectroscopic 43 constellation Cetus 43 Biogeochemistry 43 CoRoT satellite 43 HARPS spectrograph 43 astrophotographer 43 Great Observatories 43 Astrophysics Cambridge Mass. 43 Maciej Konacki 43 Confirms Continuity 43 supernova remnant 43 EarthScope 43 Radar Imaging 43 Laboratoire d' Astrophysique de 43 Paleoclimate 43 Thermal Conductivity 43 Cassini Orbiter 43 Planetary Geology 43 Nanostructured Materials 43 supergiant star 43 Arecibo radar 43 Ice Coring 43 Optus C1 42 spectroscopy 42 paleomagnetic 42 Photometer 42 Shri Kulkarni 42 Seismologist 42 Very Energetic Radiation 42 constellation Centaurus 42 WISE infrared 42 Induced polarization 42 Infrared Mapping Spectrometer 42 QWIP 42 Reservoir Characterization 42 Lick Carnegie Exoplanet 42 Large Binocular Telescope 42 Long Term Ecological 42 Satellite Launch 42 Mastcam 42 cosmological distances 42 Dalcanton 42 Ultraviolet Imaging Spectrograph 42 Rosette Nebula 42 SSRL 42 Lick Observatory 42 orbiting Hubble telescope 42 Fermi Large 42 distant supernovae 42 astronomer Edmond Halley 42 Observatoire de 42 gravitational lensing 42 X ray emission 42 gamma ray burst 42 Facility SIRTF 42 NASA STEREO 42 GROND 42 Emily Lakdawalla 42 Particle Astrophysics 42 WFC3 42 J#.# [001] 42 CloudSat 42 infrared observatory 42 infrared imager 42 Surface Sampling 42 Neutron Spectrometer 42 SCISAT 42 Ag Cu 42 crustal thickness 42 Ecological Observatory 42 pulsars 42 KamLAND 42 NASA Exobiology 42 Field Infrared Survey 42 Scorpii 42 Joseph Fourier 42 HRSC 42 Chilean Atacama Desert 42 #mm f/#-#.# 42 multispectral imager 42 Experiment NanTroSEIZE 42 AIRS instrument 42 GRB # 42 Image Sensors 42 Cat Paw Nebula 42 submillimeter wavelengths 42 Airborne Geophysical 42 Gravity Recovery 42 multispectral camera 42 galaxy M# [002] 42 HIRES spectrometer 42 Evolution Explorer 42 Ring Nebula 42 AERONET 42 Coma Cluster 42 UVES 42 microwave radiometer 42 equatorial orbit 42 Radiometric 42 ECG Electrocardiogram 42 Fomalhaut b 42 Imaging Telescope Array 42 Mars Climate Sounder 42 Evolutionary Anthropology Leipzig 42 inch refracting telescope 42 Cepheid variables 42 Galaxy Evolution 42 Hobby Eberly 42 planet orbiting 42 Transect 42 Hubble Space 42 Geosynchronous 42 detect neutrinos 42 photon counting 42 APXS 42 asteroseismology 42 Hyperspectral 42 CSIRO Wealth 41 infrared telescopes 41 Remote Sensing Satellite 41 WISE telescope 41 Ku Band 41 Planck telescope 41 Ikonos 41 Geophysical Survey 41 exoplanet orbiting 41 microscopy technique 41 plasma spectrometer 41 nightglow 41 telescope 41 Alessandro Morbidelli 41 astronomical observations 41 Solar Optical Telescope 41 spaceborne 41 BepiColombo 41 Earth Asteroid 41 Mercury exosphere 41 gravitational wave 41 Syrtis Major 41 X ray afterglow 41 Climate Experiment 41 multiband imaging photometer 41 FORCAST 41 Apstar 41 hyperspectral 41 Delfi C3 41 gravitational lenses 41 Theoretical Astrophysics 41 Square Kilometer Array 41 NASA Tropical Rainfall 41 Adaptive optics 41 Burst Alert 41 Optus D3 41 Swift Ultraviolet Optical 41 coronagraph 41 HiRISE image 41 Deep Field HUDF 41 Observatory 41 Solar Terrestrial Relations 41 GOSAT 41 Mars Orbiter 41 Geodetic 41 Neogene 41 star Fomalhaut 41 Field Imager WFI 41 sub millimeter wavelengths 41 Hyperspectral Imager 41 Satellites GOES 41 Paleobiology 41 particle astrophysics 41 Astrosat 41 spatial resolution 41 spectroscopic 41 bolometer 41 Mimas 41 MODIS instrument 41 Submillimeter Array SMA 41 SQUIDs 41 Axio Imager 41 Mesosphere 41 Lovell Telescope 41 infrared wavelength 41 STARLAB 41 Solar Dynamics 41 Research LTER 41 Comet Hartley 2 41 Makiko Sato 41 quasars 41 dBi antenna 41 GeoForschungsZentrum Potsdam 41 GEO# 41 Oceansat 41 Omega Centauri 41 Optical Telescope Element 41 IBEX spacecraft 41 geo stationary 41 IBEX Lo 41 Lars Hernquist 41 steerable radio 41 Precession 41 downlinked via 41 Comet Hartley 41 Isotopic 41 MAR ECO 41 intrinsic brightness 41 Cerro Paranal Chile 41 MISR 41 Laboratory SSRL 41 heliospheric 41 Electrodynamics 41 National Astronomical Observatories 41 constellation Pisces 41 Diviner 41 ATST 41 #x# binoculars [002] 41 gamma ray 41 William Bottke 41 Geobiology 41 Free Electron Laser 41 Crab Nebula 41 Computational Cosmology 41 Lyrae 41 geo synchronous transfer 41 ILS Proton Successfully Launches 41 gamma ray bursts 41 Super Earths 41 Proxima Centauri 41 IEEE Trans 41 Cyberinfrastructure 41 Kuiper Belt Objects 41 Shanghai Astronomical Observatory 41 XMM Newton observations 41 Geophysical Laboratory 41 refracting telescope 41 Astra 1L 41 Context Camera 41 Proba 41 Arabia Terra 41 Coel Hellier 41 radial velocity 41 extragalactic 41 Arecibo Observatory 41 Cosmic Microwave Background 41 NASA Spacecraft 41 NASA Heliophysics 41 Redu Belgium 41 Kitt Peak 41 Valles Marineris canyon 41 Pan STARRS 41 Astrophysics 41 Eurobird 41 mesospheric 40 Robotic Lunar Exploration 40 ionosphere 40 Physical Geography 40 X ray Observatory 40 geo stationary orbit 40 Europa Orbiter 40 THEMIS mission 40 W#A [001] 40 NASA Moon Mineralogy 40 infrared spectrometers 40 Astrophysical Journal 40 Distance Measurement 40 geo stationary satellite 40 Microlensing Follow Up 40 Dan Buhl Planetarium 40 Caltech physicist 40 Poly Metallic