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(Click for frequent words.) 71 E ELT 67 Giant Magellan Telescope 66 European Extremely Large 63 optical infrared telescope 60 Gran Telescopio Canarias 59 Array ALMA 59 Southern Observatory ESO 58 Telescope LSST 57 optical telescope 57 BepiColombo 57 Large Telescope 56 Thirty Meter Telescope 56 Atacama Large Millimeter Array 56 Square Kilometer Array 56 Giove B 55 Keck Telescopes 55 SAR Lupe 55 LOFAR 55 Helios 2B 55 Planck satellite 55 rocky extrasolar planet 55 aperture telescope 54 Large Synoptic Survey 54 telescope 54 infrared observatory 54 Canary Telescope 54 Very Large Telescope 54 ExoMars rover 54 Atacama Large Millimeter submillimeter 54 UKIRT 54 neutrino telescope 54 Cerro Paranal 54 Chajnantor plateau 54 Herschel telescope 54 SKA telescope 53 Las Campanas Chile 53 Rosetta spacecraft 53 NuSTAR 53 Cerro Pachon 53 JWST 53 ExoMars mission 53 COROT 53 Observatory Very 52 SELENE 52 Herschel Space 52 GOCE satellite 52 e MERLIN 52 Cerro Pachón 52 airborne observatory 52 ESA Rosetta 52 observatory telescope 52 hexagonal mirrors 52 infrared telescope 52 Cerro Armazones 52 Muchachos Observatory 52 GIOVE B 52 Large Binocular Telescope 51 planetary Transits 51 Lunar Reconnaissance Orbiter LRO 51 astronomical telescope 51 OSIRIS 51 Convection Rotation 51 XFEL 51 Hubble Space Telescope HST 51 Cassini Huygens 51 HB SIB 51 Orbit Validation IOV 51 VISTA telescope 51 Paranal Observatory 51 Experimental Reactor 51 ESA Herschel 51 ATV Johannes Kepler 51 Square Kilometre Array SKA 51 radiotelescope 51 Space Telescope GLAST 51 asteroid Lutetia 50 Cryosat 50 particle smasher 50 ESO VLT 50 SICRAL 1B 50 Alphabus 50 Galileo satellites 50 NIRSpec 50 Express orbiter 50 Terrestrial Planet Finder 50 HARPS spectrograph attached 50 astronomical observatory 50 Keck Interferometer 50 Ariane launcher 50 Keck telescopes 50 Herschel Planck 50 Stratospheric Observatory 50 Magellan telescopes 50 COROT satellite 50 SIM PlanetQuest 50 mile Gotthard Tunnel 50 MetOp 50 Roque de los 50 Paranal 50 La Silla Observatory 50 ESO La Silla 49 Astrosat 49 spacecraft Cassini 49 Phobos Grunt mission 49 Laser Interferometer Space 49 X ray telescopes 49 Rosetta orbiter 49 ExoMars 49 Mauna Kea Hawaii 49 lunar explorer 49 infrared telescopes 49 LightSail 1 49 Planck telescope 49 ESA Planck 49 Jupiter Ganymede 49 Eurobot 49 HARPS N 49 SMOS 49 telescopes 49 Cerro Tololo 49 ESO Paranal Observatory 49 International Linear Collider 49 ESO Very Large Telescope 49 Space Agency 49 comet Lulin 49 orbiting Hubble Space Telescope 49 JDEM 49 linear collider 49 probe Huygens 49 Infrared Telescope 49 Galileo constellation 49 Calar Alto 49 WISE infrared 49 ESO telescope 49 TanDEM X 49 Subaru Telescope 48 XMM Newton X ray 48 SMOS satellite 48 Square Kilometre Array 48 KA SAT 48 Galileo satellite 48 Automated Transfer Vehicle 48 Huygens Probe 48 Ice Coring 48 HB SIA 48 Webb Space Telescope 48 Astrium GmbH 48 MeerKAT 48 Hawaii Telescope CFHT 48 Proba 2 48 Orbit Validation 48 astronomical observatories 48 Solar Terrestrial Relations 48 infrared astronomy 48 La Silla Chile 48 Planetary Transits 48 WFC3 48 GALEX 48 comet chaser 48 Cargo Launch Vehicle 48 European XFEL 48 LOFAR telescope 48 SINFONI 48 Chilean Atacama Desert 48 nanosatellite 48 gamma ray observatory 48 neutrino detector 47 Advanced LIGO 47 Las Campanas Observatory 47 Long Wavelength Array 47 ITER reactor 47 Toutatis 47 Gamma ray Large 47 Helios 2A 47 SIRAL 47 refracting telescope 47 Comet Churyumov Gerasimenko 47 Solar Orbiter 47 Kibo module 47 detect gravitational waves 47 steering wheel tilts 47 Pan STARRS 47 Lovell Telescope 47 Pan STARRS telescope 47 ADM Aeolus 47 Gemini telescopes 47 adaptive optics 47 submillimetre 47 Cadarache France 47 optical telescopes 47 LSST 47 LISA Pathfinder 47 Observatory STEREO 47 GOCE 47 Jovian moons 47 StreetMapper 47 EADS Astrium GmbH 47 rover Curiosity 47 dexterous robot 47 H2A rocket 47 polar orbiting 47 robotic spacecraft 47 Ariane rocket 47 Telescope 47 NASA STEREO 47 particle detector 47 Antenna LISA 47 IBEX spacecraft 47 Koreasat 6 47 Michibiki 47 supergiant star 47 HIAPER 47 Subaru telescope 47 ITER 47 interferometer 47 ENVISAT 47 SkySat 47 SIRTF 47 AKARI 47 orbiter Cassini 46 GALILEO 46 Vega launcher 46 Observatory telescope 46 orbital observatory 46 Suzaku X ray 46 defile Mauna Kea 46 LEAP X1C 46 Jupiter Icy Moons Orbiter 46 XMM Newton 46 robotic rovers 46 Security GMES 46 Large Telescope Salt 46 OSIRIS Rex 46 Interferometer VLTI 46 enters lunar orbit 46 Skynet 5C 46 thermonuclear reactor 46 Infrared Astronomy 46 ESA GOCE 46 antenna reflector 46 ITER International Thermonuclear 46 Arecibo radar 46 spokesman Franco Bonacina 46 Super Kamiokande 46 observatories 46 X ray observatory 46 Titan flyby 46 Cygnus spacecraft 46 Cloud Aerosol Lidar 46 astronomical telescopes 46 gravitational wave 46 Lutetia 46 Faint Object 46 JIMO 46 Pluto Charon 46 ASTRA 1KR 46 SN #C 46 lensing galaxy 46 AN/FPS-# 46 Manchester Jodrell Bank 46 ASTRA 3B 46 colliders 46 Japanese Kibo lab 46 Alcatel Alenia 46 ROSAT 46 NSLS II 46 TerraSAR X 46 Ultraviolet Optical Telescope 46 entered lunar orbit 46 unpiloted 46 ESA XMM Newton 46 Optical Telescope 46 Iter 46 XMM Newton satellite 46 HiPER 46 Optical Gravitational Lensing Experiment 46 comet #P/Churyumov-Gerasimenko 46 Alphasat 46 ASTRA 1N 46 ESA ESTEC 46 Nuclear Spectroscopic Telescope Array 46 Infrared Telescope UKIRT 46 EarthCARE 46 Ulysses spacecraft 46 HARPS spectrograph 46 curved mirrors 46 7th Framework Programme 46 VLT telescope 46 gaseous planet 46 spiral galaxy Messier 46 Webb Telescope 46 Charon Pluto 46 NASA Stratospheric Observatory 46 Arabsat 5A 46 OSIRIS REx 46 Turksat 3A 46 Delfi C3 46 TrES 4 46 Multi Object Spectrograph 46 ASPERA 45 outermost planets 45 Proba 45 located atop Mauna 45 nEUROn 45 Olympus Mons 45 Alpha Particle 45 Space Infrared Telescope 45 GPS IIR M 45 synchrotrons 45 Telstar #R 45 Solar TErrestrial RElations Observatory 45 Learjet NXT 45 twin Keck telescopes 45 Delta Cephei 45 SuperWASP 45 submillimetre wavelengths 45 NASA Great Observatories 45 telescope atop Mauna 45 Mars moon Phobos 45 WIYN telescope 45 Comet #P/Churyumov-Gerasimenko 45 steerable radio 45 Borexino 45 Saturnian moon Titan 45 orbiting telescope 45 Kayser Threde 45 orbital rendezvous 45 neutrino experiment 45 Rosetta comet chaser 45 GEO# 45 Methone 45 asteroid Vesta 45 lunar orbiter 45 Meteosat 45 orbiting telescopes 45 high altitude airship 45 MPG ESO 45 Curiosity rover 45 Churyumov Gerasimenko 45 unmanned lunar 45 GMES 45 Zeta Ophiuchi 45 ESA Huygens probe 45 ASTRA 1L 45 HAMSAT 45 Cassegrain telescope 45 Metop 45 Large Binocular Telescope LBT 45 Planck observatory 45 Mid Infrared 45 ExoMars Trace Gas 45 VLBI 45 CALIPSO 45 XMM Newton observatory 45 spectroscopic observations 45 Ares IX rocket 45 cosmic cannibal 45 Cartosat 2B 45 Pierre Auger Observatory 45 Yannick d' Escatha 45 GPS IIF 45 Andromeda Galaxy 45 Fomalhaut b 45 EVLA 45 moons Phobos 45 Egnos 45 EGNOS 45 Infrared Astronomy SOFIA 45 JCSAT 9 45 Infrared Pathfinder Satellite 45 gamma ray observatories 45 Orion spacecraft 45 celestial observations 45 interferometers 45 astro comb 45 galaxy M# [002] 45 spiral galaxy NGC 45 interplanetary spacecraft 45 VLTI 45 3D Laser Mapping 45 Alenia Spazio 45 CryoSat mission 45 Orbiting Carbon Observatory OCO 45 Rosetta lander 45 Fermi telescope 45 distant quasar 45 orbital laboratory 45 Collider LHC 45 Fornax cluster 45 Oceansat 2 45 GLAST telescope 45 spaceplane 45 ATST 45 INTEGRAL satellite 45 WISE telescope 45 Orbiter LRO 45 Kuiper Belt object 44 Herschel Space Telescope 44 European Geostationary Navigation 44 Landsat satellite 44 ATV Jules Verne 44 powerful particle accelerator 44 NASA Gamma ray 44 infrared imager 44 Big Bang collider 44 ESA ASI 44 Technology Centre ESTEC 44 Foton M3 44 orbiting gamma ray 44 New Horizons spacecraft 44 orbiting observatories 44 Orbiter MRO 44 Effelsberg 44 NEOSSat 44 Tunguska asteroid 44 TSN PZ camera 44 irregularly shaped asteroid 44 ASTRON 44 SSETI Express 44 HCPV panels 44 Observatory La Silla 44 Satellite GOSAT 44 ecliptic plane 44 Main Injector Neutrino 44 Adaptive Optics 44 radio occultation 44 Astrophysical Research 44 Submillimeter Array 44 CBERS 2B 44 Jupiter Icy Moons 44 TecSAR 44 LIGO 44 cosmic ray observatory 44 amateur astronomers peering 44 planetarium dome 44 Dumbbell Nebula 44 THEMIS 44 Kliper 44 exoplanet hunter 44 observatory 44 PSLV C8 44 Yinghuo 1 44 Voorwerp 44 Grenoble Observatory 44 HiRISE camera 44 BepiColombo mission 44 CBERS 44 imaging spectrometer 44 spacecraft orbiting 44 Cubesat 44 Galileo Joint Undertaking 44 LADEE 44 Arches Cluster 44 RY Sagittarii 44 Synthetic Aperture Radar 44 DEPTHX 44 astronomers 44 MARSIS 44 LROC 44 Quadrantid meteor shower 44 satellite WorldView 44 ITER fusion 44 robotic rover 44 X ray telescope 44 QuickBird 44 elliptical galaxy NGC 44 DigitalGlobe WorldView 44 Pleiades cluster 44 barred spiral galaxy 44 BLG #Lb 44 inch refractor telescope 44 Cosmo SkyMed 44 polarimetric 44 robotic explorer 44 astrometry 44 Nikon D# Kowa 44 geostationary satellite 44 manned lunar 44 rover Opportunity 44 Moon Mineralogy Mapper M3 44 Leonid meteor showers 44 Steward Observatory 44 Hadron collider 44 D CIXS 44 binocular telescope 44 meter Keck telescopes 44 Facility SIRTF 44 neutrino detectors 44 DubaiSat 1 44 Kepler observatory 44 twin Voyager spacecraft 44 geostationary 44 X ray observatories 44 submillimeter 44 exoplanetary 44 Cosmic Origins Spectrograph COS 44 MN4 44 XTAR EUR 44 Jules Verne ATV 44 HESS telescopes 44 LCLS 44 cosmic microwave radiation 44 JIMO mission 44 High Resolution Imaging 44 Velocity Planet Searcher 44 orbiter robotic arm 44 Medspiration 44 Laser Interferometer Gravitational Wave 44 astroparticle physics 44 inhabitable planets 44 slender crescent 44 GE #.#xl wind turbines 44 deformable mirrors 44 Ares V 44 Sojourner rover 43 ChemCam 43 eyepiece #/#s f/#.# 43 La Silla observatory 43 Eurockot 43 Comet NEAT 43 Aboard Endeavour 43 GeoForschungsZentrum Potsdam 43 Stratellite 43 Molecular Biology Organization EMBO 43 GOSAT 43 David Southwood ESA 43 resolution panchromatic 43 Chandrayaan II 43 Explorer WISE 43 Omega Centauri 43 windshield wiper maneuver 43 fainter objects 43 red supergiant 43 Anik F1R 43 submillimeter wavelength 43 Guy Wormser 43 Helioseismic 43 Free Electron Laser 43 galaxy M# [001] 43 spacecraft 43 E sciencE EGEE 43 Interferometric 43 probe Chang'e 43 Mission SRTM 43 pressurized module 43 microshutters 43 SDSS telescope 43 Comet Holmes 43 Foundation ESF 43 infrared ultraviolet 43 COSMO SkyMed 43 inch Schmidt Cassegrain 43 Wide Angle Search 43 National d' Etudes 43 Virgo Cluster 43 VLBA 43 e VLBI 43 Cosmic Vision 43 Cygnus Lyra region 43 STEREO mission 43 constellation Cassiopeia 43 Relations Observatory STEREO 43 Panoramic Survey 43 Georges Charpak France 43 Kopernikus 43 extrasolar planetary systems 43 Mössbauer 43 lunar orbiters 43 Burst Alert 43 Near Infrared Camera 43 PRACE 43 ESA SMART 43 Astra 1L 43 SDSS II 43 X ray Spectrometer 43 X ray spectrometer 43 Space Interferometry Mission 43 Solar Dynamics Observatory 43 Anik F2 43 Smos 43 GJ #b [001] 43 CARTOSAT 43 Observatories 43 HARPS instrument 43 SELENE probe 43 Earthscope 43 Christiaan Huygens 43 National Astronomical Observatory 43 adaptive optics AO 43 interferometric 43 waning gibbous 43 Mars Reconnaissance Orbiter MRO 43 ESO 43 constellation Hercules 43 GPS Block IIF 43 SENER 43 Cepheid variables 43 Hispasat 1E 43 Climate Experiment GRACE 43 Virgo cluster 43 CryoSat satellite 43 orthorectified 43 Eurostar E# 43 GRB #B 43 Observatory SDO 43 Descent Imager Spectral Radiometer 43 QWIP 43 Enceladus flybys 43 Ocean Salinity 43 Hinode satellite 43 CubeSat 43 APEX telescope 43 Yahsat 1A 43 Cassini Huygens spacecraft 43 ESTRACK 43 constellation Taurus 43 Earth Observation Satellite 43 Selenological 43 moon Charon 43 ST5 43 Astro E2 43 STEREO spacecraft 43 JTIs 43 Zeiss projector 43 HISDESAT 43 THEMIS satellites 43 Astra 1M 43 orbiting 43 JCMT 43 HIRES spectrometer 43 cluster NGC 43 nanosatellites 43 ESA astronaut Christer 43 Calar Alto Observatory 43 geosynchronous satellites 43 Shuttle Radar Topography 43 largest particle collider 43 ray Space Telescope 43 Kepler spacecraft 43 Exploration Vehicle 43 Optical Spectroscopic 43 Martian rover 43 Adaptive optics 43 Science Experiment HiRISE 43 Australian SKA Pathfinder 43 Council PPARC 43 GLAST 43 INSAT 3D 42 constellation Eridanus 42 Eurostar E# platform 42 Telescope BAT 42 #/#-ton truss 42 NASA twin STEREO 42 Skynet 5B 42 Mars Climate Sounder 42 orbital insertion 42 unmanned lunar orbiter 42 Europa Orbiter 42 Infrared Astronomical Satellite IRAS 42 Keck telescope 42 hyperspectral 42 Spatiales 42 Deutsche Forschungsgemeinschaft DFG 42 IYA# 42 Agency JAXA 42 Horsehead Nebula 42 ESA Cluster 42 Mastcam 42 Telescope Array 42 satellites orbiting Earth 42 Satellite Launch Vehicle GSLV 42 NASA ESA Hubble 42 Eumetsat 42 WM Keck Observatory 42 Giovanni Cassini 42 Francis Halzen 42 Japan Kibo laboratory 42 WGS satellites 42 geo synchronous 42 Centre BNSC 42 Spectrograph 42 Context Camera 42 tsunamis recur 42 Envisat satellite 42 ESA SMOS 42 ALOS 42 arcminutes 42 starshade 42 manned Shenzhou 42 Extragalactic 42 6th Framework Programme 42 Esrange 42 Vexcel 42 Mars# 42 occultations 42 Mars Atmosphere 42 KOMPSAT 42 Marcello Coradini 42 inch Samuel Oschin 42 Epsilon Aurigae 42 Ariane 5 42 celestial object 42 orbiting Saturn 42 Planck spacecraft 42 Io Europa 42 SuperSonic Imagine 42 JAXA 42 SpaceshipTwo 42 SDSS III 42 unmanned rover 42 HEO payload 42 Dominique Cassini 42 Space Telescope 42 super perigee moon 42 NASA Orbiting Carbon 42 Daniel Sacotte 42 smallest exoplanet 42 IceCube 42 Ellery Hale 42 Apophis asteroid 42 Cartosat 42 Nimiq 5 42 Shallow Subsurface Radar 42 Anisotropy Probe WMAP 42 GÉANT 42 Supergrid 42 GLAST Burst Monitor 42 Quasi Zenith Satellite 42 Arecibo telescope 42 neutrino beam 42 Cosmic Background Explorer 42 Compton Gamma Ray 42 circumlunar 42 robotic landers 42 NPO Lavochkin 42 NICMOS 42 Operations Centre ESOC 42 exo planets 42 laser altimeter 42 microlensing events 42 LRO spacecraft 42 orbiter lander 42 NanTroSEIZE 42 proton accelerator 42 radial velocities 42 Phobos Grunt 42 extrasolar 42 Hobby Eberly telescope 42 PSLV C 42 nicknamed Xena 42 Eutelsat KA SAT 42 MARSIS instrument 42 Ikonos 42 Astrium Satellites 42 Photonics# 42 Keck Observatory 42 Beta Pictoris b 42 IceCube Neutrino Observatory 42 Fuel Cell Demonstrator Airplane 42 magnetic spectrometer 42 A# airliner 42 Meteorological Satellites 42 ALMA antennas 42 Hellas Sat 42 robotic telescopes 42 stratospheric balloon 42 DIRECTV 9S 42 ITER fusion reactor 42 OHB System AG 42 IRNSS 42 Hubble Space Telescopes 42 Chang'eI 42 Mars Pathfinder lander 42 CNES 42 UCO Lick 42 Origins Spectral Interpretation 42 WIYN 42 Leica HDS# 42 Opticks 42 Eurely 42 Kepler Mission 42 remote sensing satellite 42 hyperspectral sensors 42 Optus D3 42 astrometric 42 TU# [002] 42 ATLAS detector 42 coronagraph 42 Titan flybys 42 geo stationary orbit 42 HD#b 42 gamma ray telescope 42 NFIRE 42 plutoids 42 Thales Alenia Space 42 Redu Belgium 42 onboard Chandrayaan 42 Multi Purpose Logistics Module 42 breeder reactor PFBR 42 Rockot launcher 42 NASA MESSENGER spacecraft 42 nanoGUNE 42 APXS 42 KamLAND 42 PSLV C7 42 SpaceLoft XL 42 ASKAP 42 SumbandilaSat 42 interplanetary missions 42 Carlo Gavazzi Space 42 ARTEMIS 42 Galilean moons 42 Dan Buhl Planetarium 42 EADS SPACE Transportation 42 mu Arae 42 atop Mauna Kea 42 Substorms mission 42 astronauts Hans Schlegel 41 Thales Alenia 41 airborne refueling 41 Galileoscope 41 exo planet 41 Syrtis Major 41 IODP 41 planetarium projector 41 Submillimeter 41 GÉANT2 41 Comet Lulin 41 uncrewed 41 trans Neptunian objects 41 Virgin Galactic SpaceShipTwo 41 microlensing 41 ICESat 41 filamentary structure 41 beamline 41 MIRTHE 41 Huygens probe 41 Resourcesat 41 Astrium 41 ESA Envisat satellite 41 Galileo Avionica 41 GPS GLONASS 41 Esrange Space Center 41 Active Galactic Nuclei 41 Imaging Spectrometer 41 NASA Far Ultraviolet 41 Goonhilly 41 Orbiting Carbon Observatory 41 Carl Marchetto 41 astronaut Christer Fuglesang 41 Turksat 4A 41 drogue parachute 41 HM Cancri 41 NAOJ 41 Shuttle Discovery blasts 41 radar altimetry 41 International Thermonuclear Experimental Reactor 41 Hubble Servicing 41 hadron collider 41 interferometry 41 Great Observatories 41 Proxima Centauri 41 Interferometer 41 SMOS mission 41 Megha Tropiques 41 Extreme Ultraviolet Imaging Spectrometer 41 Astrophysics MOA 41 LHC accelerator 41 spaceborne 41 ESA Envisat 41 constellations Cygnus 41 GeoSAR 41 Radioastronomy 41 impactor 41 Shepherding Spacecraft 41 GPS IIIA satellites 41 polarimetry 41 Lunar Crater 41 Hubble Space Telescope 41 Russian Dnepr rocket 41 Satellite Launch Vehicle 41 Joint Undertaking 41 Greenhouse Gases Observing 41 geo synchronous transfer 41 Area Telescope LAT 41 Messenger spacecraft 41 orbiting Hubble telescope 41 NAVSTAR 41 Herschel SPIRE 41 Kepler #b 41 shuttle Atlantis docked 41 infrared spectrograph 41 Ritchey Chrétien 41 collider 41 Lunar Reconnaissance Orbiter Camera 41 Cassini Huygens Mission 41 cosmological observations 41 DESY 41 spaceward 41 CHARA 41 WMAP satellite 41 airglow 41 submillimeter wavelengths 41 RQ 4B 41 Arecibo radio 41 Sofradir 41 Mossbauer 41 DigitalGlobe constellation 41 black sequined bras 41 perilune 41 Trapezium 41 Hellas Basin 41 #x# binoculars [001] 41 satellite GSAT 41 Cassini spacecraft 41 Antennae Galaxies 41 constellation Ursa Major 41 Andromeda galaxy 41 GSLV D3 rocket 41 SII NanoTechnology 41 shortwave infrared 41 Dynamics Observatory 41 exoplanet discoveries 41 CFHT 41 cryo electron microscope 41 Whitelee wind farm 41 NICMOS observations 41 Insat 3A 41 SHARAD 41 Kielder Observatory 41 extrasolar planet 41 SCIAMACHY 41 Jodrell Bank Observatory 41 electric ion propulsion 41 extragalactic 41 Townpod 41 Kuiper belt objects 41 zodiacal light 41 Ionosphere Sounding 41 SiRFstarIII architecture 41 WASP #b 41 SATURN 41 local teen determ 41 NYSE ORB 41 gravitational redshift 41 NASA Kepler 41 Leica Microsystems 41 Cosmic Origins Spectrograph 41 ESA Integral 41 ESO telescopes 41 ICO G1 satellite 41 laser altimetry 41 geosynchronous transfer orbit 41 Descartes Prize 41 Earth Observation satellites 41 Human Spaceflight Microgravity 41 exoplanet orbiting 41 Astronaut Corps 41 Auger Observatory 41 Instrument OMI 41 Cartosat 2A 41 Spitzer infrared 41 remote sensing satellite Resourcesat 41 gravitational lenses 41 Kibo laboratory 41 ePaper display 41 Venusian surface 41 radiator airlock 41 SMOS Soil Moisture 41 twin STEREO spacecraft 41 EADS Astrium 41 Anisotropy Probe 41 Exoplanet Survey 41 Orion spaceship 41 optical wavelengths 41 sun synchronous orbit 41 NASA Interstellar Boundary 41 SpaceShip Two 41 Lunar Reconnaissance Orbiter 41 Telespazio 41 Agenzia Spaziale Italiana 41 lunar probe Chang'e 41 astrophysical phenomena 41 Astra 3B 41 Electron Microscope 41 Sensing Satellite LCROSS 41 TDRS K 41 launcher subsystem 41 Hobby Eberly Telescope 41 Stubai glacier 41 Very Large Array 41 Unit Telescopes 41 NAVSTAR GPS 41 Ares rocket 41 Anik G1 41 Libra constellation Vogt 41 Lunar CRater Observation 41 moon Titan 41 Mini SAR