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(Click for frequent words.) 69 Nasa spacecraft 68 spacecraft 68 Mars Odyssey spacecraft 67 Mars Reconnaissance Orbiter MRO 66 spacecraft orbiting 66 NASA rovers 65 Martian surface 65 orbiter 64 Mars Odyssey orbiter 64 orbiting Mars 64 lander 63 Orbiter MRO 63 APXS 62 Orbiter LRO 62 Cassini Huygens spacecraft 62 Lunar Reconnaissance Orbiter LRO 62 Mars rovers Spirit 62 Cassini Huygens 62 Mars orbiter 62 Mars landers 62 Martian rover 62 robotic explorer 61 Stardust spacecraft 61 satellites orbiting Mars 61 NASA Spirit rover 61 Galileo spacecraft 61 unmanned probes 61 Voyager spacecraft 61 Viking landers 61 Mars Reconnaissance Orbiter 60 Ulysses spacecraft 60 IBEX spacecraft 60 NASA Cassini spacecraft 60 rover Opportunity 60 flyby spacecraft 60 ESA Huygens probe 60 Odyssey orbiter 60 Mars orbiters 60 exosphere 59 Martian rovers 59 Phoenix lander 59 rover Spirit 59 Hayabusa probe 59 robotic spacecraft 59 HiRISE camera 59 Nasa Mars Reconnaissance 59 STEREO spacecraft 59 Opportunity rover 59 NASA MESSENGER spacecraft 59 orbiting 59 Saturn Cassini 59 planetary Transits 59 MARSIS 59 rovers Spirit 59 Mars Lander 59 interstellar particles 59 NASA Mars rover 58 Martian arctic 58 NASA Mars Odyssey 58 Huygens lander 58 satellites 58 lunar orbiters 58 robotic rovers 58 Martian lander 58 infrared telescopes 58 Cassini 58 NanoSail D 58 orbiters 58 Global Surveyor 58 gamma ray observatory 58 orbiting Saturn 58 WISE spacecraft 58 Martian dust 58 HiRISE camera aboard 58 laser altimeter 58 Observatory SDO 58 Hubble Space Telescope HST 58 NASA Cassini 58 orbiting Hubble Space Telescope 58 Viking orbiters 58 interplanetary spacecraft 58 Martian soil 58 Lunar Prospector 58 MARSIS radar 58 Huygens descent 58 ray Space Telescope 58 NASA Mars Reconnaissance 58 Mars lander 58 MESSENGER spacecraft 57 Spirit rover 57 Earth orbiting satellites 57 Curiosity rover 57 Mars orbiting spacecraft 57 crewed spacecraft 57 Cryosat 57 Saturnian moon Titan 57 orbiting observatory 57 Mars rover Opportunity 57 Stardust capsule 57 Gusev crater 57 Messenger spacecraft 57 Saturn moon 57 lunar surface 57 Kepler spacecraft 57 THEMIS satellites 57 spacecraft Cassini 57 Galilean satellites 57 orbital rendezvous 57 NASAs 57 NASA Stardust spacecraft 57 Red Planet 57 six wheeled rover 57 Rosetta spacecraft 57 Cassini spacecraft 57 DISR 57 Martian orbit 57 Cloud Aerosol Lidar 57 infrared spectrometer 57 rovers 57 moon Enceladus 57 orbiting telescope 57 Convection Rotation 57 Martian landscape 57 satellites orbiting 57 Comet Hartley 2 57 WISE infrared 56 Yinghuo 1 56 New Horizons spacecraft 56 irregularly shaped asteroid 56 THEMIS spacecraft 56 Solar Dynamics Observatory 56 Mars CRISM 56 spacecrafts 56 spacecraft orbited 56 NASA Lunar Prospector 56 Infrared Pathfinder Satellite 56 microscopic imager 56 robotic landers 56 asteroid Eros 56 unmanned spacecraft 56 ESA Mars 56 infrared observatory 56 LRO spacecraft 56 Imaging Spectroradiometer MODIS instrument 56 NASA Voyager spacecraft 56 NASA EPOXI mission 56 NASA rovers Spirit 56 Envisat satellite 56 Mars Global Surveyor 56 NASA Opportunity rover 56 Opportunity rovers 56 Mössbauer 56 Spirit Mars rover 56 orbiting Cassini spacecraft 56 Mars Odyssey 56 GOCE 56 Hubble Space Telescope 56 orbiting observatories 56 gaseous planet 56 Mars Pathfinder lander 56 NASA twin rovers 56 Clementine spacecraft 56 Nili Fossae 56 infrared telescope 56 orbiter Cassini 56 Explorer WISE 56 retroreflector 56 geosynchronous satellites 56 NASA Kepler spacecraft 56 moon Io 56 TRMM satellite 55 Mars Color Imager 55 satellites orbiting Earth 55 Martian crater 55 Martian polar 55 NASA 55 O OREOS 55 Apollo missions 55 Comet 9P/Tempel 1 55 Context Camera 55 martian 55 Mars rovers 55 Cassini flyby 55 comet nucleus 55 Aqua satellite 55 asteroid Itokawa 55 X ray telescopes 55 Mars moon Phobos 55 Saturn moon Enceladus 55 Phoenix Mars lander 55 periodic dimming 55 orbiter Mars Odyssey 55 Fermi telescope 55 Philae lander 55 flyby Cassini 55 gamma ray spectrometer 55 Mars Opportunity rover 55 martian soil 55 Rosetta orbiter 55 spacecraft Chandrayaan 1 55 Cassini spacecraft orbiting 55 meteoroid 55 Jovian moons 55 VIRTIS 55 ESA Envisat satellite 55 Reflection Radiometer 55 Neutron Detector 55 NASA Lunar Reconnaissance 55 NASA Kepler 55 XMM Newton 55 Tropical Rainfall Measuring 55 Express orbiter 55 deorbiting 55 Comet Hartley 55 Mars Orbiter Camera 55 highly elliptical orbit 55 NASA Kepler telescope 55 Nasa 55 Moderate Resolution Imaging 55 airglow 55 probe Huygens 55 Deep Impact probe 55 exoplanetary 54 extrasolar 54 Huygens probe 54 spokesman Michael Braukus 54 Sensing Satellite LCROSS 54 Evolution Explorer 54 BepiColombo 54 twin rover Opportunity 54 CALIPSO 54 rover 54 occultations 54 lander Beagle 2 54 Epoxi 54 robotic lander 54 SuitSat 54 X ray telescope 54 Diviner 54 LORRI 54 Voyager probes 54 Viking Lander 54 CryoSat mission 54 Composite Infrared Spectrometer 54 GALEX 54 Saturn moons 54 heavily cratered 54 Sojourner rover 54 WISE telescope 54 orbit 54 ROCSAT 2 54 CoRoT satellite 54 Huygens Probe 54 geostationary orbits 54 Martian atmosphere 54 penetrating radar 54 Mars Orbiter 54 Reconnaissance Orbiter 54 Hubble Space telescope 54 NASA THEMIS 54 SIRTF 54 ESA ASI 54 reconnaissance orbiter 54 Venusian surface 54 fainter objects 54 Churyumov Gerasimenko 54 twin rovers Spirit 54 Mini Thermal Emission 54 martian landscape 54 Phoenix Mars Lander 54 galactic cosmic rays 54 MetOp satellite 54 Mission TRMM satellite 54 ESA XMM Newton 54 spacecraft flyby 54 noctilucent clouds 54 RXTE 54 Mars Pathfinder 54 icy moons 54 binary asteroid 54 polar orbiting satellites 54 icy comets 54 polar craters 54 Jovian moon 54 moonlets 54 Enceladus flybys 54 comet particles 54 NASA Stratospheric Observatory 54 lunar landers 54 Opportunity Mars rover 54 Titan flyby 54 polar vortex 54 NASA rover Spirit 54 Solar Terrestrial Relations 54 LCROSS spacecraft 54 NASA Cassini orbiter 54 ESA Planck 54 STSS Demo 54 Herschel Space Telescope 54 Orbiter 54 Mini TES 54 Planetary Transits 53 moons Phobos 53 Huygens 53 HiRISE images 53 Beta Pictoris b 53 orbiting satellites 53 KAGUYA 53 HiRISE image 53 Deep Impact comet 53 asteroid 53 Observatory STEREO 53 Relations Observatory STEREO 53 martian atmosphere 53 SMOS 53 Mars Surveyor 53 Climate Experiment GRACE 53 Jet Propulsion Laboratory JPL 53 NASA STEREO 53 Foton M3 53 NASA Odyssey orbiter 53 Samuel Oschin Telescope 53 MetOp 53 GOCE satellite 53 NFIRE 53 Wilkinson Microwave Anisotropy Probe 53 Foton spacecraft 53 telescope 53 Mars rovers Opportunity 53 Landsat satellite 53 Itokawa 53 WMAP satellite 53 LCROSS mission 53 reentry capsule 53 Martian equator 53 shadowed craters 53 Chang'eI 53 thruster firings 53 electric ion propulsion 53 Phobos Grunt 53 Cassini orbiter 53 SIM PlanetQuest 53 orbiting gamma ray 53 lander rover 53 jovian 53 Planck satellite 53 THEMIS mission 53 stationary lander 53 spaceborne 53 CRISM 53 Foton M2 53 subsurface ocean 53 lunar equator 53 Planck telescope 53 STIS 53 meteoroids 53 asteroid Steins 53 Mars Spirit rover 53 Viking Orbiter 53 Landsat satellites 53 X ray spectrometer 53 EPOXI mission 53 robotic rover 53 NFIRE satellite 53 visit http:/saturn.jpl.nasa.gov 53 LRO 53 Thermal Emission Spectrometer 53 flyby 53 Martian rocks 53 NASA Interstellar Boundary 53 Shuttle Radar Topography 53 comet flyby 53 Manned missions 53 LCROSS 53 Atlantis undocks 53 Uninhabited Aerial Vehicle 53 Martian 53 NASA Far Ultraviolet 53 Hayabusa spacecraft 53 NASA Gamma ray 53 NuSTAR 53 Herschel telescope 53 spectrometer 53 Global Surveyor spacecraft 53 phyllosilicates 53 drogue parachute 53 SHARAD 53 Martian terrain 52 radiosondes 52 twin Voyager spacecraft 52 solar corona 52 micrometeoroids 52 NASA Lunar Crater 52 Solar TErrestrial RElations Observatory 52 CARTOSAT 52 Mars 52 microshutters 52 NASA CloudSat 52 highly elliptical orbits 52 Envisat satellites 52 Rosetta lander 52 satellite 52 Kepler Mission 52 ion thrusters 52 Epsilon Eridani 52 TerraSAR X satellite 52 lunar orbiter 52 CloudSat 52 Itokawa asteroid 52 situ measurements 52 PASADENA Calif. NASA 52 Keck telescopes 52 Spacecraft 52 comets asteroids 52 Comet #P/Churyumov-Gerasimenko 52 robotic probes 52 lunar craters 52 dexterous robot 52 lunar regolith 52 LISA Pathfinder 52 Metop 52 Lunar Orbiter 52 Keck Interferometer 52 Comet Churyumov Gerasimenko 52 innermost planet 52 impactor 52 GOSAT 52 Stardust NExT mission 52 Russian Nikolai Budarin 52 NASA Solar Terrestrial 52 onboard Chandrayaan 52 ICESat 52 comet Wild 52 Dynamics Observatory 52 ringed planet 52 Iridium satellites 52 shepherding spacecraft 52 neutron spectrometer 52 asteroid Vesta 52 http:/www.nasa.gov/cassini 52 imaging spectrometer 52 LADEE 52 Deep Impact flyby spacecraft 52 lander robotic arm 52 SOHO spacecraft 52 JIMO 52 Oleg Skripochka 52 Mission TRMM 52 GOES satellites 52 CHIPSat 52 Orbiting Carbon Observatory 52 ExoMars rover 52 GIOVE B 52 Lunar CRater Observation 52 Eutelsat KA SAT 52 Hubble 52 Resourcesat 2 52 Jupiter Ganymede 52 Orbiter spacecraft 52 Heliospheric Observatory SOHO 52 Mossbauer spectrometer 52 ESA Rosetta 52 Galaxy Evolution 52 nanosatellite 52 preset orbit 52 martian surface 52 lunar orbits 52 planet magnetosphere 52 LRO LCROSS 52 ASTRA 1KR 52 AERONET 52 twin rover Spirit 52 Titan flybys 52 Mercury flyby 52 ROSAT 52 Lunokhod 52 NASA Wilkinson Microwave 52 Saturn rings 52 robotic explorers 52 lunar soil 52 GOES N 52 infrared spectrometers 52 comet Lulin 51 SBSS Block 51 orbiting telescopes 51 Nasa Mars Odyssey 51 Earthlike planets 51 Diviner instrument 51 slender crescent 51 COROT 51 NROL 51 transiting planets 51 HiRISE 51 durable twin rovers 51 Martian craters 51 INSAT 4CR 51 Herschel Space 51 Huygens mission 51 Ranging spacecraft 51 Earth ionosphere 51 permanently shadowed craters 51 orbiting Mars Odyssey 51 radar altimetry 51 Compact Reconnaissance Imaging Spectrometer 51 ESA ERS 51 hydroxyl molecules 51 Venusian atmosphere 51 cometary 51 Saturn magnetosphere 51 Impact Probe MIP 51 Jupiter Icy Moons 51 HRSC 51 High Resolution Imaging 51 comets orbiting 51 alien civilizations 51 THEMIS Images 51 telescopic observations 51 Analyzer TEGA 51 legged lander 51 Geosynchronous 51 Interior Laboratory GRAIL 51 interstellar dust 51 moon Charon 51 Terrestrial Planet Finder 51 moonquakes 51 Discovery undocks 51 EPOCh 51 ESA Huygens 51 cosmic ray 51 coronagraph 51 Corot 7b 51 http:/saturn.jpl.nasa.gov 51 EPOXI spacecraft 51 hexagonal mirrors 51 telescopic camera 51 MESSENGER 51 stellar occultations 51 KBOs 51 geosynchronous satellite 51 astronomical telescope 51 Comet Halley 51 Upsilon Andromedae 51 twin rovers 51 BBSNews #-#-# NASA 51 radar altimeter 51 telescopes 51 Ocean Salinity SMOS 51 lunar orbit 51 Planck spacecraft 51 Mössbauer spectrometer 51 Spitzer Space Telescope 51 Fomalhaut b 51 Comet Lulin 51 hematite mineral 51 Mars rover Spirit 51 Deep Impact spacecraft 51 hypersonic speeds 51 Interstellar Boundary Explorer 51 icy moon Enceladus 51 Phobos 51 Pancam 51 moon Europa 51 POES satellites 51 AKARI 51 extrasolar planet 51 twin Mars rovers 51 landers 51 shuttle orbiter 51 infrared spectrograph 51 Resourcesat 51 Cartosat 2B 51 Earthlike planet 51 Mars rover 51 Geostationary Operational Environmental 51 GOES O 51 orbit GEO 51 Shenzhou capsule 51 SMOS mission 51 spacecraft thrusters 51 lander unfurled 51 Gliese #c 51 bedrock outcropping 51 polarimetric 51 Meridiani 51 thermal emission spectrometer 51 comet dust 51 Hubble observations 51 Near Infrared Camera 51 ChemCam 51 NASA Hubble Space 51 Wallops Island Va. 51 NASA rover Opportunity 51 Mars Climate Sounder 51 geostationary satellite 51 planemos 51 Fermi Telescope 51 DigitalGlobe WorldView 51 Ariane rocket 51 NASA LCROSS 51 moon Phobos 51 interstellar dust grains 50 SBSS satellite 50 X ray observatories 50 unmanned Chandrayaan 50 Proba 2 50 Advanced Microwave Scanning 50 astronauts 50 Shenzhou spacecraft 50 NASA MESSENGER 50 manned missions 50 robot rovers 50 LROC 50 antisatellite weapon 50 synchronous orbit 50 outer planets 50 GSLV D3 rocket 50 retrograde orbit 50 Spaceguard Survey 50 Huygens spacecraft 50 Anisotropy Probe WMAP 50 neutron detector 50 orbits 50 geosynchronous 50 GJ #b [001] 50 orbiter robotic arm 50 geostationary satellites 50 Infrared Astronomy SOFIA 50 Saturnian moon 50 Chandrayaan 50 GJ #b [002] 50 celestial observations 50 Infrared Array Camera 50 JAXA 50 UAVSAR 50 Rover MER 50 Endeavour docked 50 hyperspectral imager 50 smallest exoplanet 50 ATV Johannes Kepler 50 DMSP F# 50 Kepler Space Telescope 50 TEGA oven 50 auroral emissions 50 Kurs automated 50 Solar Dynamics 50 Alpha Particle 50 meteorological satellites 50 Reflection Radiometer ASTER 50 spectrographs 50 Ares IX rocket 50 AMIE camera 50 Lunar Reconnaissance Orbiter Camera 50 spectrographic 50 Mossbauer 50 comet 50 NEOWISE 50 polarimetry 50 Eagle lunar lander 50 Ranging MESSENGER spacecraft 50 Orion spacecraft 50 Infrared Astronomy 50 DIXI 50 Cabeus 50 northern arctic plains 50 windshield wiper maneuver 50 Rover Opportunity 50 closest flyby 50 manned lunar missions 50 spectroscopic observations 50 commander Leroy Chiao 50 Earth asteroid Itokawa 50 SpaceX Dragon capsule 50 Robotic Arm Camera 50 stellar occultation 50 Mission SRTM 50 wheeled rovers 50 Magnetic Imager HMI 50 Saturn outermost moon 50 planet Gliese #g 50 P/# A2 50 circumstellar disk 50 unmanned lunar 50 Ocean Salinity 50 Epsilon Aurigae 50 remote sensing satellite 50 geyser plumes 50 STEREO 50 exhaust plume 50 Jupiter icy moons 50 comet Hartley 2 50 Hubble telescope 50 aboard Taurus XL 50 optical telescopes 50 comet Churyumov Gerasimenko 50 NASA ICESat 50 asteroidal 50 dust devils 50 impactor spacecraft 50 Shenzhou V 50 planetary transits 50 SSMEs 50 Upsilon Andromedae b 50 shuttle Endeavour astronauts 50 Lunar Module Eagle 50 Moessbauer spectrometer 50 NIRSpec 50 C NOFS 50 Jupiter Icy Moons Orbiter 50 Wilkinson Microwave Probe 50 scramjets 50 CBERS 50 reconnaissance satellites 50 geosynchronous orbit 50 moon Titan 50 Discovery liftoff 50 radio occultation 50 CBERS 2B 50 axial tilt 50 Saturn aurora 50 aboard ESA Envisat 50 Resolution Stereo Camera 50 spectrometers 50 ESO VLT 50 Anisotropy Probe 49 Shackleton crater 49 rover Sojourner 49 Soyuz launcher 49 remote sensing satellites 49 manned Shenzhou 49 CloudSat radar 49 Martian winters 49 gamma ray detectors 49 probe Chang'e 49 Kepler telescope 49 CALIPSO satellites 49 lunar missions 49 cometary dust 49 NASA Atmospheric Infrared 49 TanDEM X 49 remote sensing instruments 49 Herschel Planck 49 Centaur rocket 49 THEMIS 49 Saturn Enceladus 49 PSLV rocket 49 NEOSSat 49 Progress resupply 49 mooncraft 49 Spectrograph 49 Saturnian system 49 coronal holes 49 lensing galaxy 49 Gliese #d 49 Martian plains 49 ESA SMART 49 WASP #b 49 NASA Aqua 49 Galilean moons 49 International Space Station 49 lunar probes 49 Russian Salizhan Sharipov 49 Kiruna Sweden 49 Lunar Reconnaissance Orbiter 49 Kazakhstan Baikonur Cosmodrome 49 Synthetic Aperture Radar 49 scatterometer 49 WFC3 49 DubaiSat 1 49 Oceansat 2 49 thruster rockets 49 Advanced Spaceborne Thermal Emission 49 Descent Imager Spectral Radiometer 49 GEO satellites 49 pulsating aurora 49 cometary nucleus 49 Sounder AIRS instrument 49 remote sensing satellite Resourcesat 49 polar orbit 49 orbiting Hubble telescope 49 orbiter lander 49 INSAT satellite 49 Sun synchronous orbit 49 piggybacked Huygens probe 49 RHESSI 49 HiRise camera 49 stratospheric balloon 49 outermost planets 49 Isidis Planitia 49 X ray emission 49 GJ#b 49 Insat 4B 49 jarosite 49 geo synchronous 49 Horizons spacecraft 49 Yarkovsky effect 49 neutrino detectors 49 IKONOS 49 twin STEREO spacecraft 49 Measuring Mission TRMM 49 AATSR 49 Mars Polar Lander 49 polar orbiting 49 Mars Rover 49 Orbital Express 49 Lander robotic arm 49 planetary missions 49 NASA WMAP 49 Taurus XL rocket 49 Kosmos 3M rocket 49 planetary geologists 49 asteroids 49 circular orbits 49 cometary debris 49 Constellation Observing 49 Endurance crater 49 Comet Encke 49 NASA Landsat 49 Science Experiment HiRISE 49 interferometric synthetic aperture radar 49 ecliptic plane 49 exoplanet hunter 49 Orbiting Carbon Observatory OCO 49 OMEGA instrument 49 planets orbiting sun 49 Flyby spacecraft 49 VISTA telescope 49 comet McNaught 49 EPOXI 49 ENVISAT 49 ARISSat 49 heat shield 49 interplanetary probes 49 Doppler measurements 49 ion thruster 49 Spitzer infrared spectrograph 49 MTSAT 1R 49 stuck Mars rover 49 planets Uranus 49 Mars Descent Imager 49 earth orbiting satellites 49 moons orbiting 49 DART spacecraft 49 Yuri Shargin 49 Globalstar constellation 49 airborne particles affect 49 rover Curiosity 49 noctilucent 49 substorms 49 sister rover Spirit 49 Saturnian moons 49 Minotaur rocket 49 TRMM 49 Imaging Spectrometer 49 Fengyun 1C 49 Cassini flybys 49 Cabeus crater 49 Libra constellation Vogt 49 Discovery astronauts 49 astronomical observations 49 Spectroradiometer MODIS 49 Neutron Spectrometer 49 martian rocks 49 COSMO SkyMed 49 NASA satellites orbiting 49 infrared wavelengths 49 Galactic cosmic rays 49 Shallow Subsurface Radar 49 Comet Boethin 49 ESO telescopes 49 OSIRIS REx 49 spacewalking specialists 49 orbital insertion 49 phyllosilicate 49 Earthlike 49 elongated orbit 49 RADARSAT 2 49 extraterrestrial civilizations 49 Kepler Telescope 49 optical wavelengths 49 Microscopy Electrochemistry 49 Meteorological Satellite 49 Orionids 49 X ray binary 49 interplanetary missions 49 INSAT 4B 49 X ray Observatory 49 planetesimals 49 X ray observatory 49 Enceladus flyby 49 millisecond pulsar 49 Infrared Astronomical Satellite IRAS 49 unstowed 49 Satellite GOES 49 supercomputer simulations 49 LAGEOS 49 Jupiter flyby 49 Remote sensing 49 Hubble Telescope 48 Rover Spirit 48 GPS IIF 48 Shackleton Crater 48 GSAT 5P 48 MODIS instrument 48 astronomers 48 moonwalkers 48 Laser Interferometer Space 48 Jonathan Lunine 48 Planetary Fourier Spectrometer PFS 48 Moon Mineralogy Mapper M3 48 HEO payloads 48 robotic geologists 48 zodiacal light 48 SCIAMACHY 48 GeneSat 1 48 orbiting astronauts 48 Earth asteroids 48 extrasolar planets orbiting 48 Microscopic Imager 48 Nuclear Spectroscopic Telescope Array 48 robotic rover Spirit 48 Lt. Col. Yang Liwei 48 Space Telescope GLAST 48 Kuiper belt objects 48 shadowed crater 48 Martian arctic plains 48 Stratellite 48 TerraSAR X 48 Kounotori2 48 parachutes malfunctioned 48 ESA Envisat 48 Bonneville Crater 48 Mercury magnetosphere 48 extrasolar planets 48 orbiting Kepler telescope 48 rocky planets 48 AU Mic 48 Di Achille 48 moon permanently shadowed 48 hydrated minerals 48 orbiting Chandra 48 orbited Jupiter 48 HD#b 48 orbital resonance 48 spaceflyers 48 Glonass K 48 Chajnantor plateau 48 undocks 48 martian meteorites 48 planets asteroids 48 Jenniskens 48 sun synchronous orbit 48 Shuttle undocks 48 Fregat upper stage 48 infrared imagery 48 NOAA GOES 48 OGLE TR #b 48 Valles Marineris 48 optical microscope 48 rotating neutron stars 48 MESSENGER MErcury Surface 48 Spitzer infrared 48 #/#-ton truss 48 OSIRIS 48 lunar crust 48 enters lunar orbit 48 RQ# 48 asteroids Ceres 48 coronal loops 48 MG J# +# 48 IKAROS 48 astrobiologists 48 GRACE satellites 48 Astronaut Sunita Williams 48 Earth orbit LEO 48 sunlike star 48 Skynet 5C 48 Earth orbit 48 observatories 48 Spectrometer 48 lunar 48 Shenzhou VI capsule 48 infrared astronomy 48 Robotic Arm 48 sunlike stars 48 electromagnetic signals 48 YES2 48 distant supernovae 48 Apollo astronauts 48 Caldwell Dyson 48 telescopes astronomers 48 aerobraking 48 NEAs 48 Marsis 48 Discovery undocked 48 ST5 48 Martian dust devils 48 planets orbiting 48 Meridiani Planum 48 thin crescent