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(Click for frequent words.) 80 Comet #P/Churyumov-Gerasimenko 76 comet #P/Churyumov-Gerasimenko 73 Comet Churyumov Gerasimenko 72 Churyumov Gerasimenko 69 comet chaser 68 asteroid Steins 68 #P/Churyumov-Gerasimenko 68 asteroid Vesta 68 Rosetta spacecraft 67 ESA Rosetta 65 lander Philae 65 P Churyumov Gerasimenko 65 Stardust spacecraft 65 Pluto Charon 64 Saturnian system 64 innermost planet 64 Saturn Cassini 63 NASA Stardust spacecraft 63 asteroid Itokawa 63 Philae lander 63 Orbiter LRO 63 spacecraft Cassini 62 Earth asteroid Itokawa 62 lunar equator 62 comet Wild 62 Mars moon Phobos 62 Comet Hartley 2 62 Mars Pathfinder lander 62 New Horizons spacecraft 62 ESA Huygens probe 62 Comet Tempel 1 61 Epoxi 61 Galileo spacecraft 61 Deep Impact eXtended Investigation 61 ecliptic plane 61 Saturnian moons 61 EPOXI spacecraft 61 shepherding spacecraft 61 NASA MESSENGER spacecraft 61 Cassini Huygens 61 comets asteroids 60 closest flyby 60 orbited Jupiter 60 Nasa Mars Odyssey 60 asteroids Ceres 60 Meridiani plains 60 Curiosity rover 60 Titan flyby 60 comet Wirtanen 60 robotic explorer 60 BepiColombo 60 Convection Rotation 60 NASA rovers Spirit 60 jovian 60 Solar TErrestrial RElations Observatory 60 Jovian moons 60 interstellar dust samples 60 NASA Cassini 60 Comet Hartley 60 Rosetta orbiter 60 Huygens 60 OSIRIS REx 60 lunar orbit 60 Cassini Huygens spacecraft 60 Isidis Planitia 60 Sojourner rover 60 outer planets 60 highly elliptical orbit 60 NEAR Shoemaker 59 Nasa Deep Impact 59 NASA twin rovers 59 Itokawa asteroid 59 Shepherding Spacecraft 59 Lunar Reconnaissance Orbiter LRO 59 flyby spacecraft 59 Comet Boethin 59 Huygens mission 59 Mars Reconnaissance Orbiter MRO 59 cometary 59 Ranging spacecraft 59 IBEX spacecraft 59 comet nucleus 59 Martian equator 59 twin Voyager spacecraft 59 Ocean Salinity 59 Saturn outermost moon 59 Nasa spacecraft 59 Kepler Space Telescope 59 exoplanets planets 59 Orbiter MRO 59 Kepler 9c 58 planetary Transits 58 Comet Halley 58 Kuiper Belt Objects 58 Ulysses spacecraft 58 Planetary Transits 58 Mars Phobos 58 elliptical orbits 58 Deep Impact comet 58 NASA EPOXI mission 58 gravitational keyhole 58 Nasa Mars Reconnaissance 58 Express orbiter 58 circular orbit 58 #/#-ton girder began 58 twin rover Opportunity 58 Foton M3 58 laser altimeter 58 comet 58 Voyager spacecraft 58 EPOXI mission 58 sunlike star 58 Deep Impact craft 58 lander rover 57 Sensing Satellite LCROSS 57 Samuel Oschin Telescope 57 MESSENGER spacecraft 57 Kepler spacecraft 57 Martian orbit 57 Io Europa 57 ESA Huygens 57 Epsilon Eridani 57 Bonneville Crater 57 Cassini Equinox 57 Ring Nebula 57 WISE spacecraft 57 Viking Lander 57 perihelion 57 stationary lander 57 robotic rovers 57 comets orbiting 57 reentry capsule 57 moons Phobos 57 Yinghuo 1 57 Martian terrain 57 Cassini orbiter 57 spacecraft 57 Shackleton crater 57 Rosetta lander 57 inhabitable planets 57 SMOS Soil Moisture 57 Phoebe orbits 57 NASA rovers 57 entered lunar orbit 57 six wheeled rover 57 gaseous planet 57 NASA THEMIS 57 EPOCh 57 geyser plumes 57 ESA Mars 57 permanently shadowed crater 57 planetary surfaces 57 orbital rendezvous 57 spacecraft orbited 57 asteroid flyby 57 APXS 57 THEMIS satellites 57 Messenger spacecraft 57 exoplanetary 57 orbiting Saturn 56 planet Gliese #g 56 Saturnian 56 Comet Lulin 56 NFIRE satellite 56 LCROSS spacecraft 56 moon Io 56 Characterization EPOCh 56 impactor spacecraft 56 asteroid Lutetia 56 Comet Tempel Tuttle 56 orbiting observatories 56 magnetotail 56 comet Hartley 2 56 ESA comet chaser 56 Huygens probe 56 orbiting gamma ray 56 comet McNaught 56 icy moons 56 MUSES C 56 Syrtis Major 56 DIXI 56 spacecraft Chandrayaan 1 56 Phobos Grunt 56 asteroids orbiting 56 geo stationary orbit 56 MARSIS radar 56 Solar Orbiter 56 Sojourner Rover 56 onrushing comet 56 interplanetary spacecraft 56 twin rover Spirit 56 robotic explorers 56 Upsilon Andromedae 56 elliptical polar 56 heliopause 56 retrograde orbit 56 Martian surface 56 CoRoT satellite 56 Heliospheric Observatory SOHO 56 VIRTIS 56 Steins asteroid 55 Saturnian moon Titan 55 Red Planet 55 ESA Herschel 55 NASA LCROSS 55 planets orbits 55 Flyby spacecraft 55 exo planet 55 cometary dust 55 Huygens lander 55 enters lunar orbit 55 retroreflector 55 Cygnus Lyra region 55 Itokawa 55 O OREOS 55 Huygens Probe 55 whiz harmlessly 55 Endeavour Crater 55 comet flyby 55 Oort cloud 55 celestial sphere 55 cometary debris 55 LRO LCROSS 55 ESA Planck 55 Ocean Salinity SMOS 55 planet Uranus 55 Ringed Planet 55 Endurance crater 55 interstellar particles 55 Cassini 55 Methone 55 ringed planet 55 lander 55 comet Tempel 1 55 swingby 55 Geminga 55 robotic lander 55 Mars Odyssey spacecraft 55 Comet 9P/Tempel 1 55 aphelion 55 orbital inclination 55 heavily cratered 55 Stardust NExT 55 Jupiter icy moons 55 Chang'eI 55 MESSENGER 55 comet dust 55 Stardust capsule 55 Gliese #e 55 NASA MESSENGER 55 LRO spacecraft 55 Philae 55 Ultraviolet Imaging Spectrograph UVIS 55 Uranus Jupiter 55 circumlunar 55 Jupiter Ganymede 55 SIRTF 55 dimensional atlas 55 simulated lunar 55 Viking landers 55 Space ENvironment GEochemistry 55 HiRISE image 55 SIM PlanetQuest 55 interstellar dust grains 55 protoplanet 55 rover Spirit landed 55 galaxy M# [001] 55 Mars Orbiter Camera 55 Perseus Cluster 55 Mars Pathfinder 55 crewed spacecraft 55 orbital 55 Voyager probes 55 radial velocity technique 55 Atlantis undocks 55 geo synchronous 55 subsurface ocean 54 Shuttle Atlantis blasts 54 Rosetta comet 54 orbiting Mars 54 rover Sojourner 54 Crewmate Tracy Caldwell 54 Hubble Space Telescope HST 54 exosolar planets 54 Jupiter moons 54 Martian rocks 54 Martian rovers 54 layered bedrock 54 Mars landers 54 asteroid Eros 54 Cryosat 54 comet Tempel Tuttle 54 Saturn moon Mimas 54 Cassini flyby 54 sized planets orbiting 54 Zeta Ophiuchi 54 RQ# 54 Deep Impact Extended 54 moon Charon 54 Giovanni Cassini 54 orbits 54 copper fortified impactor 54 NASA STEREO 54 probe Huygens 54 NASA Kepler spacecraft 54 Earth magnetotail 54 Eridanus 54 lunar orbits 54 stellar occultation 54 IKAROS 54 Origins Spectral Interpretation 54 NASA Voyager spacecraft 54 orbital eccentricity 54 frozen sunless 54 Mars Odyssey 54 Galilean satellites 54 gradiometer 54 smallest exoplanet 54 Hayabusa capsule 54 Martian polar 54 orbiting 54 Fomalhaut b 54 Titan flybys 54 Solar Dynamics Observatory 54 pericentre 54 ExoMars rover 54 Fornax cluster 54 Planitia 54 NASA Deep Impact 54 KAGUYA 54 constellation Carina 54 comet Boethin 54 bedrock outcropping 54 Reconnaissance Orbiter 54 Gusev crater 54 NEOWISE 54 Earth magnetosphere 54 HiRISE camera aboard 54 Martian crater 54 gamma ray spectrometer 54 Foton spacecraft 54 Rover Opportunity 54 binary asteroid 54 lunar surface 54 geo synchronous transfer 54 Infrared Pathfinder Satellite 54 moonlet 54 prograde 54 hypersonic speeds 53 Canadian Julie Payette 53 asteroid 53 thin crescent 53 transiting exoplanet 53 airglow 53 exo planets 53 twin rovers Spirit 53 rover Opportunity 53 ESA ASI 53 Fermi telescope 53 Swift Tuttle 53 COROT 53 spaceward 53 Taurus Littrow Valley 53 Deep Impact flyby spacecraft 53 orbital velocity 53 martian surface 53 orbit GEO 53 Hubble orbits 53 LADEE 53 orbiter lander 53 rotational axis 53 Horizons spacecraft 53 asteroid belt 53 STSS Demo 53 NFIRE 53 Tempel 1 53 Relations Observatory STEREO 53 Cassini flybys 53 ATV Johannes Kepler 53 Taurus Littrow 53 Nili Fossae 53 CALIPSO 53 Rosetta comet chaser 53 unmanned probes 53 Jules Verne ATV 53 lunar module Eagle 53 retrograde orbits 53 Odyssey orbiter 53 visit http:/saturn.jpl.nasa.gov 53 NASA Lunar Crater 53 lunar crust 53 spiral galaxy NGC 53 Virgo Cluster 53 NASA Lunar Prospector 53 Oort Cloud 53 orbiter Cassini 53 irregularly shaped asteroid 53 impactor 53 SBSS satellite 53 moon Phobos 53 ejecta blanket 53 Trojan asteroids 53 Lunar CRater Observation 53 orbiting observatory 53 planets Uranus 53 Spitzer infrared spectrograph 53 moon Mab 53 smoothest flattest spot 53 Manned missions 53 Martian rover 53 orbiting Hubble Space Telescope 53 Gamma ray burst 53 extrasolar 53 elongated orbits 53 GEochemistry 53 Earthlike planet 53 ST5 53 periodic dimming 53 Venusian surface 53 Cometary 53 Oceanus Procellarum 53 elongated orbit 53 Martian arctic plains 53 Mars 53 SCISAT 53 Gliese #c 53 Coma Cluster 53 unmanned rover 53 GJ#b 53 NASA rover Spirit 53 EPOXI 53 icy comets 53 reconnaissance orbiter 53 mu Arae 53 NASA MErcury Surface 53 Investigation DIXI 53 Permanent Multipurpose Module PMM 53 Planetary Fourier Spectrometer PFS 53 Cassini spacecraft orbiting 53 satellites orbiting Earth 53 extrasolar planetary 53 Stardust NExT mission 53 Europa Orbiter 53 Mercury flyby 53 Skynet 5C 53 SBSS Block 53 constellation Andromeda 53 exosphere 52 Jupiter magnetosphere 52 Opportunity rover 52 Japan Hayabusa spacecraft 52 PSR J# 52 Valles Marineris canyon 52 remote sensing instruments 52 ah dus 52 Venusian atmosphere 52 circumstellar disk 52 Global Surveyor 52 LISA Pathfinder 52 volcanic moon Io 52 slender crescent 52 THEMIS spacecraft 52 spacecraft thrusters 52 rovers Spirit 52 orbital resonance 52 planets asteroids 52 telescopic observations 52 thruster rockets 52 THEMIS mission 52 Descent Imager Spectral Radiometer 52 Gerhard Schwehm 52 Cabeus crater 52 Jovian moon 52 DEPTHX 52 celestial observations 52 copper impactor 52 STEREO spacecraft 52 Martian plains 52 orbits Saturn 52 lunar occultation 52 PharmaSat 52 Galaxy Evolution 52 Hubble Space telescope 52 martian 52 Upsilon Andromedae b 52 NASA Kepler telescope 52 NEAs 52 NASA Kepler 52 Beta Pictoris b 52 ESA GOCE 52 Hadley Rille 52 mere fly bys 52 GOCE satellite 52 Kepler observatory 52 Charon Pluto 52 martian atmosphere 52 Jupiter flyby 52 spiral galaxy Messier 52 Saturn moons 52 lunar orbiters 52 Optical Spectroscopic 52 polar orbit 52 stellar occultations 52 NuSTAR 52 Galilean moons 52 GA6 52 MG J# +# 52 Pleiades star 52 magnetospheric 52 radio occultation 52 gamma ray observatory 52 Smos 52 DISR 52 Compton Gamma Ray 52 Toutatis 52 orbiting Hubble telescope 52 rover Spirit 52 Japanese Kibo laboratory 52 Earthlike planets 52 Mars Surveyor 52 Foton M2 52 Huygens descent 52 Tempel Tuttle 52 constellation Cetus 52 equatorial orbit 52 orbiter 52 Corot 7b 52 Mars Gusev Crater 52 lunar craters 52 Opportunity Mars rover 52 robotic geologists 52 Mars rovers Spirit 52 interstellar boundary 52 Saturn moon 52 Epsilon Aurigae 52 infrared spectrometers 52 Observatory SDO 52 cosmic cannibal 52 protoplanets 52 microscopic imager 52 Bug Nebula 52 equatorial plains 52 Mössbauer spectrometer 52 Space Environment Geochemistry 52 Cassini Huygens Mission 52 highly elliptical orbits 52 cosmic particles 52 Lutetia 52 Kiruna Sweden 52 polar plateau 52 shuttle Discovery blasted 52 Cloud Aerosol Lidar 52 proto planetary disk 52 P/# A2 52 ray Space Telescope 52 moons Io 52 Cosmonaut Yuri Gagarin 52 Planck spacecraft 52 Jupiter moon Io 52 Rockot launch 52 orbit insertion 52 Comet McNaught 52 THEMIS Images 52 Moessbauer spectrometer 52 ESA SMART 52 maritime subsurface 52 moons orbiting Saturn 52 Martian lander 52 constellation Ursa Major 52 Greenbelt Md. manages 52 MARSIS 51 constellation Auriga 51 constellation Eridanus 51 aboard Taurus XL 51 NASA Interstellar Boundary 51 Mandushev 51 celestial equator 51 Lunokhod 51 LightSail 1 51 Saturn moons Titan 51 Foton M3 spacecraft 51 synchronous polar 51 Lander robotic arm 51 Virgin Galactic unveils 51 piggybacked Huygens probe 51 Orbiter 51 celestial object 51 Saturn magnetosphere 51 LCROSS 51 Mars orbiter 51 shadowy craters 51 SpaceShip Two 51 Mars Color Imager 51 LORRI 51 Neutron Spectrometer 51 Stardust spacecraft swooped 51 constellation Scorpius 51 robotic geologist 51 Halley comet 51 Sun synchronous orbit 51 captured interstellar dust 51 Opportunity parachuted 51 Elenin 51 Shoemaker Levy 51 GOCE 51 Herschel Space 51 Lake Cheko 51 occultations 51 Enceladus flybys 51 Candor Chasma 51 DART spacecraft 51 orbital insertion 51 Kuiper belt 51 penetrating radar 51 SMOS 51 constellation Virgo 51 orbiting telescope 51 Muchachos Observatory 51 Andromeda galaxy 51 windshield wiper maneuver 51 C1XS 51 navigate autonomously 51 High Resolution Imaging 51 distant supernovae 51 Security Regolith Explorer 51 substorm 51 moons circling 51 NASA Cassini spacecraft 51 Kepler Telescope 51 twin rovers 51 energetic electrons 51 Saturnian moon 51 COROT 7b 51 Epimetheus 51 GLAST telescope 51 moon Mimas 51 moonlets 51 permanently shadowed craters 51 Pleiades cluster 51 lobate scarps 51 NASA twin STEREO 51 Dutch astronomer Christiaan 51 perilune 51 comet nuclei 51 Mars Opportunity rover 51 kimberlite outcrop 51 Orbiter Processing Facility OPF 51 spacecraft flyby 51 WISE infrared 51 ion propulsion 51 Space Shuttle STS 51 Herschel telescope 51 robotic spacecraft 51 orbit 51 NextSat 51 ATV Jules Verne 51 Roddenberrys remains 51 lunar orbiting spacecraft 51 Phobos 51 asteroids Vesta 51 mineralogical mapping 51 particle analyzers 51 waning gibbous 51 Endurance Crater 51 interstellar space 51 Pancam 51 Orion nebula 51 Mawrth Vallis 51 unmanned lunar 51 mineral olivine 51 star Proxima Centauri 51 Nasa Kepler 51 constellation Hercules 51 planet Gliese #c 51 hydroxyl molecules 51 occulted 51 moon Deimos 51 OSTM Jason 2 51 WISE telescope 51 Deep Impact probe 51 BLG #Lb 51 Rosetta 51 Yarkovsky effect 51 Enceladus flyby 51 cosmological distances 51 robot rovers 51 mesosphere 51 radial velocities 51 unmanned spacecraft 51 STP S# 51 ecliptic 51 Viking orbiters 51 Japan Kibo laboratory 51 distant galaxy 51 SPICAM 51 Kepler Mission 51 aboard Soyuz TMA 51 axial tilt 51 Harmony Node 51 Planck observatory 51 orbiters landers 51 star Spica 51 G#.# +#.# 51 galactic disk 51 muon neutrino 51 Solar Terrestrial Relations 51 Highly Adaptable Satellite 51 Apollo missions 50 Victoria Crater 50 Helioseismic 50 star IM Pegasi 50 Mars rovers Opportunity 50 ESA Integral 50 neutron spectrometer 50 thrilling stargazers 50 interstellar dust particles 50 planet magnetosphere 50 remote sensing satellite Resourcesat 50 moon Enceladus 50 galactic halo 50 Fregat upper stage 50 Pirs docking compartment 50 Explorer WISE 50 Mössbauer 50 submillimetre 50 Martian arctic 50 Cretaceous periods 50 dwarf spheroidal 50 Planck satellite 50 Astronauts inspect 50 Titan Saturn 50 comet tail 50 Comet Encke 50 WMAP satellite 50 Dumbbell Nebula 50 comets 50 hexagonal mirrors 50 Shallow Subsurface Radar 50 Galactic cosmic rays 50 exoatmospheric kill vehicle 50 NEOSSat 50 interplanetary 50 Terra Sirenum 50 Diviner 50 Helios 2B 50 ballistic trajectory 50 Spitzer infrared telescope 50 SMOS mission 50 Deep Impact spacecraft 50 lunar landers 50 Kazakhstan steppe 50 lunar crater 50 JPL manages 50 Spaceguard Survey 50 Insat 3A 50 distant supernovas 50 circularize 50 Envisat satellite 50 moon permanently shadowed 50 spacecrafts 50 manned lunar missions 50 Hayabusa spacecraft 50 Jupiter Icy Moons 50 Martian craters 50 suborbital trajectory 50 HiRise camera 50 Mount Bosavi 50 ARRL AMSAT 50 lunar explorers 50 electric ion propulsion 50 Climate Sounder 50 THEMIS 50 Mercury Uranus 50 Shuttle Discovery blasts 50 Veil Nebula 50 autonomous rendezvous 50 Saturn Enceladus 50 Encke gap 50 OCO satellite 50 faint smudge 50 shuttle Endeavour STS 50 Proxima Centauri 50 habitable worlds 50 Orbital Express 50 MESSENGER MErcury Surface 50 elliptical orbit 50 circumstellar 50 Laboratory MSL 50 Solar System 50 hunting Kepler telescope 50 DMSP F# 50 Mars Reconnaissance Orbiter 50 imaging spectrometer 50 neutral mass spectrometer 50 NASA rover Opportunity 50 Terra Meridiani 50 neutrino particles 50 Cancri e 50 flyby 50 ADM Aeolus 50 Earth swingby 50 entire Milstar constellation 50 GQ Lupi 50 Interstellar Boundary Explorer 50 outer corona 50 Taurids 50 infrared telescope 50 comet particles 50 Hayabusa probe 50 Spirit Mars rover 50 geoneutrinos 50 Boethin 50 comets moons 50 interferometric synthetic aperture radar 50 NASA Lunar Reconnaissance 50 Martian atmosphere 50 #/#-hour parachute 50 Trifid Nebula 50 Impact Probe MIP 50 arctic plains 50 eclipsing binaries 50 gravitational slingshot 50 solar corona 50 Earth ionosphere 50 Caloris Basin 50 Astro E2 50 MARSIS instrument 50 Mini Thermal Emission 50 TNOs 50 waxing crescent 50 SpaceX Dragon capsule 50 Magnetic Imager HMI 50 Uranus Neptune 50 HD#b 50 ENVISAT 50 Aqua satellite 50 Fra Mauro 50 Synthetic Aperture Radar SAR 50 exhaust plume 50 Russians Fyodor Yurchikhin 50 ASTRA 1KR 50 constellation Aquila 50 SHARAD 50 Corot 9b 50 Olympus Mons 50 Kuiper belt objects 50 OMEGA instrument 50 Moderate Resolution Imaging 50 orbiting spacecraft 50 Planck telescope 50 Explorer GALEX 50 Gerard Kuiper 50 constellation Sagittarius 50 Atlantis rocketed 50 SOHO spacecraft 50 Rockot launcher 50 Lagoon Nebula 50 LightSail 50 Mars rover Opportunity 50 VY Canis Majoris 50 GRACE satellites 50 Keck Interferometer 50 NASA Cosmic Background 50 Mars northern latitudes 50 Stardust mothership 50 Reflection Radiometer 50 OSIRIS 50 protoplanetary 50 constellation Ara 50 Chajnantor plateau 50 twin STEREO spacecraft 50 LSAM 50 http:/saturn.jpl.nasa.gov 50 Gakkel Ridge 50 Antarctic Dry Valleys 50 Mars Uranus 50 constellations Cygnus 50 outer heliosphere 50 martian soil 50 INSAT 4CR 50 rocky extrasolar planet 50 outermost planets 50 Lunar Roving Vehicle 50 Mission SRTM 50 Shuttle Endeavour undocks 50 JTAC declared 50 supergiant star 50 constellation Aquarius 50 MErcury Surface Space ENvironment 50 Diviner instrument 50 HIRES spectrometer 50 Herschel Space Telescope 50 circumstellar disks 50 Hyakutake 50 Rover MER 50 HiRISE camera 50 Noachian era 50 Kazakhstan barren steppe 50 parabolic arcs 50 Hellas Basin 50 orbiting telescopes 50 Saturn moon Enceladus 50 Eurockot Launch Services 50 asteroids 50 detect gamma rays 49 XMM Newton X ray 49 coronal loops 49 Shuttle Endeavour docks 49 heliosheath 49 OGLE TR #b 49 Europa Ganymede 49 xenon propellant 49 inertial guidance 49 constellation Taurus 49 Cassini Image 49 smoothest flattest 49 AB Aurigae 49 cosmic ray detector 49 TanDEM X 49 CryoSat satellite 49 YU# 49 CoRoT 9b 49 Titan smoggy 49 Dominique Cassini 49 Giovanni Schiaparelli 49 Impactor 49 heliospheric 49 Tharsis Rise 49 Evolution Explorer 49 Stephan Quintet 49 NASA ICESat 49 Centaur rocket 49 Chilean Atacama Desert 49 COROT exo 3b 49 transiting planet 49 tidal bulge 49 orbiting Kepler telescope 49 Milensky 49 X ray observatory 49 exoplanetary systems 49 Mini SAR 49 geosynchronous 49 NASA Solar Terrestrial 49 Alexander Samokutyayev 49 Radiation Belt 49 proto cluster 49 Proba 2 49 zodiacal constellations 49 WASP #b 49 rovers 49 penumbral shadow 49 Jenniskens 49 unmanned lunar orbiter 49 Ikaros 49 Utopia Planitia 49 Virgin Galactic SpaceShipTwo 49 Michael Studinger 49 Multi Object Spectrometer 49 terahertz frequency 49 elliptical galaxy NGC 49 maneuvering thrusters 49 Saturn outermost 49 PSLV C# rocket 49 weather satellite TIROS 49 Comet Machholz 49 abyssal plain 49 simulated Martian 49 constellation Centaurus 49 Nares Strait 49 galactic equator 49 phyllosilicate 49 Kuiper Belt object 49 Valles Marineris 49 Extrasolar Planet Observation 49 moon Ganymede 49 albedo reflectivity 49 SpaceLoft XL 49 GALEX 49 N. Rathnasree 49 meteoritic material 49 X ray telescopes 49 planets orbiting distant 49 LRO 49 moons Europa 49 Atlantis Undocks From 49 SpaceX Dragon 49 apogee farthest point 49 Ares Vallis 49 moons orbiting 49 extrasolar worlds 49 NASA Spirit rover 49 Imaging Spectroradiometer MODIS instrument 49 Quadrantid meteor shower 49 smallest exoplanets 49 Human Spaceflight Microgravity 49 Comet #P 49 Mars Polar Lander 49 exoplanets orbiting 49 comet Lulin