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(Click for frequent words.) 74 rovers 72 lander 69 Spirit rover 68 Mars rover 64 Mars Exploration 64 rover Spirit 63 rover Opportunity 62 spacecraft 61 robotic explorer 61 Martian surface 61 Mars rover Spirit 61 robotic rovers 60 NASA Mars rover 60 martian 59 martian surface 59 Mars rovers 59 orbiter 59 lunar surface 59 Opportunity rover 58 Sojourner rover 58 orbiter lander 58 twin rover Spirit 58 twin rover Opportunity 58 Purgatory Dune 58 rovers Spirit 58 Mars rover Opportunity 57 Victoria Crater 57 Mars Reconnaissance Orbiter 57 orbiting Mars 57 Red Planet 57 NASA rovers 57 robotic geologist 57 sols 57 NASA rovers Spirit 56 Mars Pathfinder 56 six wheeled rover 56 stationary lander 56 Mars Gusev Crater 56 robotic spacecraft 56 Mars 56 Gusev crater 56 Moessbauer spectrometer 55 Martian 55 Mars rovers Spirit 55 hardware Theisinger 55 twin rovers 55 ExoMars rover 55 APXS 55 Nasa 54 orbiting spacecraft 54 Spirit Mars rover 54 Bonneville Crater 54 NASA Spirit rover 54 Mars Rover 54 thermal emission spectrometer 54 Mars lander 54 Curiosity rover 54 Opportunity rovers 54 Phoenix Mars Lander 54 robotic lander 54 robotic rover 54 Mars Odyssey spacecraft 54 robotic arm 54 Martian rovers 54 Mossbauer spectrometer 54 Stardust spacecraft 54 Phoenix Mars lander 54 rock outcrop 54 LRO 54 orbiting telescope 53 Theisinger 53 Saturn Cassini 53 flyby spacecraft 53 Mars landers 53 Rover Spirit 53 rover robotic arm 53 microscopic imager 53 Mars Odyssey orbiter 53 Martian soil 53 Mars Reconnaissance Orbiter MRO 53 Nasa spacecraft 53 Martian crater 53 Odyssey orbiter 52 Rover MER 52 Orbiter MRO 52 Endurance crater 52 martian soil 52 Terrestrial Planet Finder 52 landers 52 Martian rover 52 Mars Lander 52 Mini Thermal Emission 52 Hubble 52 Martian terrain 52 asteroid Itokawa 52 Martian winters 52 Huygens 52 lander rover 52 Nasa Jet Propulsion 52 Lunar Rover 52 MARSIS radar 52 OSIRIS REx 52 Mini TES 51 lunar 51 Mössbauer spectrometer 51 Global Surveyor 51 twin rovers Spirit 51 robotic landers 51 wheeled rover 51 Isidis Planitia 51 Mars Odyssey 51 Orbiter 51 NASA Jet Propulsion Laboratory 51 HiRISE 51 orbiting observatory 51 Cassini 51 reconnaissance orbiter 51 robotic geologists 51 Lunar Reconnaissance Orbiter LRO 51 Lunar Roving Vehicle 51 JPL rover 51 simulated lunar 51 Huygens probe 51 Rock Abrasion Tool 51 Endurance Crater 51 orbit 51 MESSENGER 51 Meridiani plains 50 Voyager spacecraft 50 gray hematite mineral 50 JIMO 50 impactor 50 Mars orbiting spacecraft 50 Martian landscape 50 Viking landers 50 telescopic observations 50 Comet Churyumov Gerasimenko 50 Churyumov Gerasimenko 50 Saturnian moon Titan 50 Martian arctic 50 wheeled robot 50 PASADENA Calif. NASA 50 panoramic camera 50 spacecraft orbiting 50 NASA 50 moon 50 Phoenix lander 50 lunar regolith 50 robotic explorers 50 twin Mars rovers 50 IBEX spacecraft 50 NanoSail D 50 unmanned spacecraft 50 Meridiani Planum 49 Itokawa 49 Opportunity Mars rovers 49 Gusev Crater 49 Huygens lander 49 satellites orbiting Earth 49 crewed spacecraft 49 Mars orbiter 49 orbiting 49 Kepler spacecraft 49 Voyager probes 49 Philae lander 49 Erebus Crater 49 HiRISE camera 49 asteroid Eros 49 Jet Propulsion Laboratory 49 asteroid 49 JPL 49 retroreflector 49 WISE spacecraft 49 astronauts 49 shuttle Endeavor 49 Reconnaissance Orbiter 49 Comet #P/Churyumov-Gerasimenko 49 Mars moon Phobos 49 BepiColombo 49 robotic probes 49 highly elliptical orbit 49 lunar equator 49 Orbiter LRO 49 Nasa Mars Reconnaissance 49 nanosatellite 49 Opportunity Mars rover 49 telescope 49 starboard SARJ 49 NASAs 48 lunar orbiter 48 laser altimeter 48 Titan flyby 48 Venusian surface 48 ExoMars 48 Cryosat 48 LRO LCROSS 48 SIM PlanetQuest 48 Mars Surveyor 48 Messenger spacecraft 48 comet Churyumov Gerasimenko 48 spacecrafts 48 GeneSat 1 48 Manned missions 48 lunar orbit 48 Miniature Thermal Emission 48 Mars Color Imager 48 Shackleton Crater 48 Martian plains 48 THEMIS 48 Stardust capsule 48 robotic Canadarm 48 unmanned probes 48 orbital velocity 48 NASA Stardust spacecraft 48 NASA rover Spirit 48 ST5 48 ESA Huygens probe 48 orbiters 48 comet Boethin 48 asteroid Vesta 48 interplanetary spacecraft 48 lunar rover 48 Chandrayaan II 48 orbital rendezvous 48 GOCE 48 New Horizons spacecraft 48 clumpy soil 48 Martian equator 48 Astrosat 48 robot rovers 48 stabilizing gyroscopes 48 X ray spectrometer 48 rock abrasion 48 Mars Pathfinder lander 48 Jet Propulsion Laboratory JPL 48 TacSat 48 Huygens mission 48 Hubble Space Telescope 48 geosynchronous orbit 48 Galileo spacecraft 48 orbiting Hubble Space Telescope 48 rocket thrusters 48 lunar module 47 exoplanetary 47 Jovian moons 47 Thermal Emission Spectrometer 47 SSETI Express 47 Flyby spacecraft 47 infrared telescope 47 rover Sojourner 47 impactor spacecraft 47 Lunar Reconnaissance Orbiter 47 NASA Kepler telescope 47 lunar landing 47 Jupiter icy moons 47 Phobos Grunt 47 Launch Abort System 47 WISE telescope 47 bedrock outcropping 47 Apollo missions 47 PSLV rocket 47 asteroid Steins 47 Rosetta lander 47 Lunar CRater Observation 47 Clementine spacecraft 47 gamma ray spectrometer 47 planet Gliese #g 47 wheeled rovers 47 Interior Laboratory GRAIL 47 probe Huygens 47 Hubble telescope 47 Yinghuo 1 47 Mars Global Surveyor 47 Herschel telescope 47 Pancam 47 lunar craters 47 MESSENGER spacecraft 47 SIRTF 47 odometry 47 Astrobotic 47 Huygens Probe 47 MARSIS 47 LROC 47 Viking Lander 47 Sensing Satellite LCROSS 47 Panoramic Camera 47 JAXA 47 Rosetta spacecraft 47 robotic rover Spirit 47 outer planets 47 Mercury flyby 47 Mars Spirit rover 47 DEPTHX 47 mooncraft 47 CRISM 47 Ares IX rocket 47 lunar orbiter Chandrayaan 47 Deep Impact comet 47 lunar landers 47 Jules Verne ATV 47 Mars CRISM 47 manager Pete Theisinger 47 unmanned rover 47 Ranging spacecraft 47 DART spacecraft 47 lunar rovers 47 Joe Melko 47 LCROSS spacecraft 47 Lunokhod 47 Alpha Particle 47 Chandrayaan 47 tumbleweed rover 47 NASA Jet Propulsion 47 MER rovers 47 D CIXS 47 orbital altitude 46 Pete Theisinger 46 perilune 46 astrobiological 46 Mars orbiters 46 lunar module pilot 46 NASA rover Opportunity 46 LCROSS mission 46 COROT 46 NASA Odyssey orbiter 46 Viking orbiters 46 GSLV rocket 46 Rosetta orbiter 46 lunar orbiters 46 lunar crater 46 Yarkovsky effect 46 deorbiting 46 ChemCam 46 Endeavour Crater 46 ion propulsion 46 Jupiter Ganymede 46 twin Voyager spacecraft 46 lunar crust 46 unmanned lunar 46 polar craters 46 NASA Opportunity rover 46 GSLV D3 46 highly elliptical orbits 46 ExoMars mission 46 Huygens descent 46 dexterous robot 46 Laboratory MSL 46 Polar Lander 46 Discovery STS 46 John Callas rover 46 Jovian moon 46 DISR 46 heatshield 46 arctic plains 46 NASA THEMIS 46 Peter Theisinger 46 Cassini Huygens 46 OSIRIS Rex 46 Explorer WISE 46 NuSTAR 46 Epoxi 46 NFIRE 46 LCROSS 46 Giove B 46 electric ion propulsion 46 SPHERES 46 International Space Station 46 NASA MESSENGER spacecraft 46 extravehicular activities 46 interplanetary missions 46 Orbital Express 46 orbiter robotic arm 46 ion thrusters 46 Kurs automated 46 Gravity Probe B 46 Chang'eI 46 thruster 46 Hubble Space Telescope HST 45 Earth orbiting satellites 45 Zeta Ophiuchi 45 unstowed 45 celestial observations 45 LADEE 45 satellites orbiting 45 innermost planet 45 Mars Polar Lander 45 Centaur rocket 45 EPOXI 45 geosynchronous 45 Upsilon Andromedae 45 Stardust NExT mission 45 legged lander 45 manned lunar landing 45 Ares IX 45 Ulysses spacecraft 45 planetary Transits 45 Solar Orbiter 45 shuttle orbiter 45 Kaguya 45 orbiting observatories 45 Nasa Mars Odyssey 45 Microscopic Imager 45 YES2 45 Space Telescope Imaging Spectrograph 45 Martian atmosphere 45 Tidbinbilla 45 Mars Opportunity rover 45 Shackleton crater 45 Lunar Module 45 STORRM 45 heat shield 45 GOCE satellite 45 Comet Hartley 2 45 Martian dust 45 vast Gusev Crater 45 LORRI 45 Martian rocks 45 NextSat 45 Mössbauer 45 planetary 45 planetary exploration 45 # Apophis 45 NROL 45 lunar module Eagle 45 detect gravitational waves 45 Itokawa asteroid 45 Jajuan Harley 45 shuttle undocks 45 Orbiters 45 rover Spirit landed 45 Discovery undocks 45 Earth orbit 45 ESA Rosetta 45 geo stationary orbit 45 Phobos 45 regolith 45 spacecraft Chandrayaan 1 45 rover Curiosity 45 Desert RATS 45 Pilot George Zamka 45 lunar lander 45 lunar explorer 45 Pluto Charon 45 NASA Mars Odyssey 45 HiRISE camera aboard 45 Javes Lewis 45 NASA MESSENGER 45 asteroids 45 ESA Huygens 45 NASA Lunar Crater 45 HiRISE images 45 O OREOS 45 plucky rover 45 SMOS 45 Saturnian system 45 irregularly shaped asteroid 45 Martian orbit 45 Mossbauer 45 EVAs 45 Comet Boethin 45 lunar spacecraft Chandrayaan 45 space shuttle Discovery 45 NASA Kepler spacecraft 45 ROCSAT 2 45 shuttle astronauts 45 Eagle lunar lander 45 JWST 44 spacecraft Cassini 44 CALIPSO 44 PharmaSat 44 FASTSAT 44 circular orbit 44 planetary missions 44 Chandrayan 44 Martian arctic plains 44 comet Wirtanen 44 ATV Johannes Kepler 44 Saturn Enceladus 44 gradiometer 44 thruster firings 44 lunar soil 44 parafoil 44 lander Beagle 2 44 Cancri e 44 Planck satellite 44 drogue parachute 44 Spacecraft 44 STEREO mission 44 SuitSat 44 lander Philae 44 Ed Weiler NASA 44 NASA LCROSS 44 martian landscape 44 LRO spacecraft 44 orbits 44 shuttle Atlantis 44 Delta Cephei 44 Nili Fossae 44 comet #P/Churyumov-Gerasimenko 44 Lunar Module Pilot 44 Jupiter Icy Moons 44 Lander robotic arm 44 Insat 4B 44 Chodas 44 thrusters 44 Solar Terrestrial Relations 44 Mars rovers Opportunity 44 Fotino 44 Mars Orbiter Camera 44 orbital 44 MUSES C 44 Fomalhaut b 44 Lunar Excursion Module 44 Cartosat 2B 44 spaceship 44 Hubble Space telescope 44 infrared telescopes 44 spacesuit 44 Mars Orbiter 44 spacecraft thrusters 44 NASA Cassini 44 Elachi 44 GOES O 44 gaseous planet 44 Hayabusa 44 unmanned lunar orbiter 44 PSLV C# 44 probe Chang'e 44 shuttle Discovery 44 Cassini orbiter 44 Earth asteroid Itokawa 44 Mastcam 44 orbital insertion 44 Kepler Mission 44 Autosub 44 ultraviolet spectrograph 44 Solar Dynamics Observatory 44 NASA Lunar Reconnaissance 44 protoplanet 44 shuttle underbelly 44 Canadarm2 44 Herschel Space Telescope 44 GRACE satellites 44 shepherding spacecraft 44 geosynchronous satellite launch 44 Beagle 44 Rover Opportunity 44 INSAT 4B 44 spacecraft Hayabusa 44 LCROSS Lunar Crater Observation 44 alpha particle X ray 44 NASA Voyager spacecraft 44 Moessbauer 44 comet nucleus 44 NASA twin rovers 44 permanently shadowed craters 44 Benthic Rover 44 crawler transporter 44 STSS Demo 44 HiRISE image 44 Kuiper belt object 44 Orion spacecraft 44 Martian lander 44 manned lunar 44 rover panoramic 44 Jean Pierre Lebreton Huygens 44 Hayabusa spacecraft 44 GJ #b [001] 44 orbital observatory 44 Deep Impact mission 44 Shenzhou spacecraft 44 equatorial orbit 43 spectrometer 43 lunar orbiter Chang'e 43 GJ#b 43 Sample Return 43 geo synchronous transfer 43 uncrewed 43 Pluto Kuiper Belt 43 Opportunity parachuted 43 comet 43 ADM Aeolus 43 Global Surveyor spacecraft 43 exoplanet hunter 43 SnoMotes 43 Compton Gamma Ray 43 lunar probe Chang'e 43 Ares IY 43 hibernation mode 43 moon Phobos 43 comet flyby 43 X ray observatory 43 orbiting Saturn 43 Wolszczan 43 jagged ridge 43 flyby Cassini 43 Earth asteroids 43 Herschel Space 43 orbiters landers 43 SpaceLoft XL rocket 43 sister rover Spirit 43 Rockot launch 43 orbiting complex 43 Mini SAR 43 onboard Chandrayaan 43 Mars Descent Imager 43 Kepler observatory 43 airglow 43 icy moons 43 asteroid flyby 43 pressurized rovers 43 orbit GEO 43 Endeavour STS 43 geostationary orbits 43 unplanned spacewalk 43 Apollo astronauts 43 Earthlike planets 43 Jean Luc Margot 43 orbit insertion 43 flyby 43 MetOp satellite 43 Jupiter flyby 43 reentry capsule 43 permanently shadowed crater 43 spokesman Michael Braukus 43 Cargo Launch Vehicle 43 Lunar Reconnaissance Orbiter Camera 43 Trimble R8 GNSS 43 Gerhard Schwehm 43 interstellar particles 43 CloudSat 43 layered bedrock 43 ESA GOCE 43 moon landers 43 periodic dimming 43 NASA Mars Reconnaissance 43 ion thruster 43 unpowered 43 Dragon capsule 43 field Infrared Survey 43 Discovery astronauts 43 Context Camera 43 micrometeorite 43 shuttle 43 Permanent Multipurpose Module 43 Diviner 43 moons Phobos 43 Webb Telescope 43 radar altimeter 43 lunar orbits 43 retrorockets 43 orbited Jupiter 43 Johns Hopkins Applied Physics 43 CDR SO 43 Apophis 43 Shuttle astronauts 43 penetrating radar 43 Sensing Satellite 43 GSLV F# 43 Cassini flyby 43 Cassini spacecraft 43 lunar probe 43 heavily cratered 43 Cassini Huygens spacecraft 43 YU# 43 Wilkinson Microwave Anisotropy Probe 43 Hubble gyroscopes 43 Shepherding Spacecraft 43 BepiColombo mission 43 Hubble Space 43 lander robotic arm 43 moonquakes 43 Deep Impact craft 43 Proba 2 43 phyllosilicates 43 Spacewalkers Scott Parazynski 43 Binary Colloidal Alloy 43 INSAT 4CR 43 Kibo module 43 NASA Ames 43 Samuel Oschin Telescope 43 reusable spacecraft 43 payloads 43 comet particles 43 manager Jennifer Trosper 43 Giant Kangaroo Rats 43 INSAT satellite 43 Solar TErrestrial RElations Observatory 43 KAGUYA 43 Orion capsule 43 Saturn moon 43 Kepler Space Telescope 42 synchronous orbit 42 gravitational keyhole 42 Spacewatch 42 NASA Kepler 42 Pad #B 42 Gliese #d 42 Diviner instrument 42 Altair lunar lander 42 Taurus XL rocket 42 Insat 3A 42 shuttle Endeavour STS 42 planets Uranus 42 X #B 42 moonbase 42 aboard Atlantis 42 Pirs module 42 lunar missions 42 navigate autonomously 42 extrasolar planets 42 Comet Halley 42 ESA Mars 42 subsurface ocean 42 THEMIS satellites 42 ship thermal shielding 42 Lunar Prospector 42 steering wheel tilts 42 astronaut 42 Apollo lunar 42 Keck telescopes 42 Ashley Stroupe 42 winged spacecraft 42 Mars Squyres 42 Nuclear Spectroscopic Telescope Array 42 Engelauf 42 David Wettergreen 42 CitySense 42 smallest exoplanet 42 Martian polar 42 autonomous rendezvous 42 Ultraviolet Imaging Spectrograph UVIS 42 robotic arm Canadarm2 42 X ray telescopes 42 volcano Olympus Mons 42 celestial sphere 42 GeneSat 42 dimensional atlas 42 Lunar Orbiter 42 Upsilon Andromedae b 42 GALEX 42 Cosmic Background Explorer 42 CHIPSat 42 SARJ 42 Jupiter Icy Moons Orbiter 42 shuttle Endeavour 42 Reusable Launch Vehicle 42 Atlantis robotic arm 42 enters lunar orbit 42 Chang'e 42 NASA Stratospheric Observatory 42 Ares I. 42 director Charles Elachi 42 planets 42 Gliese #g 42 AU Mic 42 Kibo JPM JEM Pressurized 42 gamma ray observatory 42 Astronauts Scott Parazynski 42 GSLV D3 rocket 42 GOES satellites 42 Kepler 9c 42 urine recycler 42 moon Io 42 Moon Impactor Probe 42 Hubble servicing 42 Planetary Society 42 NASA Lunar Prospector 42 NIRSpec 42 excavate trench 42 Orbiting Carbon Observatory 42 hematite mineral 42 SPACE.com 42 microshutters 42 Helios 2B 42 extrasolar 42 Mars northern latitudes 42 NASA ICESat 42 Squyres 42 NASA EPOXI mission 42 meteoroid 42 Stardust NExT 42 Thirty Meter Telescope 42 Planetary Transits 42 Shuttle Endeavor 42 Epsilon Eridani 42 infrared observatory 42 polar orbit 42 sol 42 NPO Lavochkin 42 MPCV 42 ISS robotic arm 42 Hayabusa probe 42 space shuttle 42 Convection Rotation 42 blastoff 42 Europa Orbiter 42 retrograde orbit 42 LISA Pathfinder 42 mission Chandrayan 42 EKV 42 windshield wiper maneuver 42 Terrain Mapping Camera 42 Titan flybys 42 Endeavour 42 duration spaceflights 42 Comet Machholz 42 ESOC 42 Dream Chaser 42 MN4 42 Foton M3 42 Canadarm2 robotic arm 42 Charon Pluto 42 cosmonaut Alexander Kaleri 42 solar arrays 42 RQ# 42 Commander George Zamka 42 telescope eyepiece 42 docking adapter 42 extrasolar planetary systems 42 Earth orbit LEO 42 ejecta blanket 42 Relations Observatory STEREO 42 Planetary Laboratory 42 Galaxy Evolution 42 Deep Impact flyby spacecraft 42 Anthony Houllis 42 simulated Martian 42 Atlantis payload bay 42 aerobraking 42 Comet Hartley 42 Asteroid Itokawa 42 spectrograph 42 ATV Jules Verne 42 Regolith 42 GLAST 42 radio occultation 42 CubeSats 42 Minotaur rocket 42 Radiation Belt 42 axial tilt 42 OBSS 41 SELENE 41 Mission Control 41 spacecraft orbited 41 Kuiper Belt object 41 Keck Observatory 41 Olympus Mons 41 interplanetary 41 Pillinger 41 Deep Impact spacecraft 41 All Terrain Hex 41 TDRS K 41 SBSS satellite 41 SSMEs 41 Launch Pad #B 41 Naoko Yamazaki 41 Cygnus spacecraft 41 comets asteroids 41 Hubble Telescope 41 Nasa Deep Impact 41 Cosmonaut Valery Tokarev 41 Globalstar satellites 41 Kepler #b 41 lunar outpost 41 GSLV rockets 41 Ocean Salinity SMOS 41 telemeter 41 Today waxing Virgo 41 Spaceguard Survey 41 cosmic ray 41 particle detector 41 stellar occultation 41 motorized rasp 41 Lagrangian 41 Mars rover Curiosity 41 Earth magnetotail 41 scramjet 41 Minotaur IV rocket 41 microlensing 41 astrophysical phenomena 41 payload 41 Space Shuttle Discovery 41 Valles Marineris canyon 41 MARSIS instrument 41 copper impactor 41 Huygens spacecraft 41 Thermal Emission Imaging 41 crater rim 41 Impact Probe MIP 41 Jupiter moons 41 orbiting gamma ray 41 Taurus XL 41 cosmos 41 OGLE TR #b 41 geosynchronous satellite 41 slender crescent 41 STP S# 41 Ares rocket 41 Near Infrared Camera 41 Applied Physics Laboratory 41 orbiting Kepler telescope 41 Martian equatorial plains 41 YORP effect 41 deorbit burn 41 John Grotzinger 41 astronaut helper 41 Observatory SDO 41 GPS IIF 41 HiRise camera 41 Robotic Arm 41 NASA Cassini orbiter 41 space shuttle Atlantis 41 remote sensing satellite Resourcesat 41 NASA STEREO 41 planetary rovers 41 Crew Exploration 41 Laboratory Pasadena 41 exosphere 41 Epsilon Aurigae 41 mission Chandrayaan 41 Rick Sturckow 41 AMASE 41 Skripochka 41 Space ENvironment GEochemistry 41 Synthetic Aperture Radar 41 crater 41 Toutatis 41 Atlantis astronauts 41 Atlantis STS 41 Atlantis undocks 41 dust devils 41 closest flyby 41 unscheduled spacewalk 41 martian atmosphere 41 magnetic polarity 41 Fuk Li Mars 41 DMSP F# 41 spaceward 41 Astronaut Karen Nyberg 41 entered lunar orbit 41 geostationary satellite 41 spinning gyroscopes 41 aeroshell 41 thrust oscillation 41 comet chaser 41 Resourcesat 2 41 prograde 41 Descent Imager Spectral Radiometer 41 Robotic Arm Camera 41 HD#b 41 geosynchronous satellites 41 JCSAT 9 41 Taurus Littrow 41 NASA Orbiting Carbon 41 Marsis 41 X ray Spectrometer 41 MetOp 41 optical telescopes 41 COROT exo 3b 41 Cape Canaveral Fla. 41 radial velocity 41 interstellar dust samples 41 Hematite Slope 41 mini sub Nautile 41 stuck Mars rover 41 Lunar Surface 41 planets orbits 41 Cassini spacecraft orbiting 41 kg payload 41 Corot 7b 41 COROT 7b 41 Asteroid 41 Infrared Pathfinder Satellite 41 telescopes atop Mauna 41 Whillans Ice Stream 41 polar orbiting 41 Daniel Tani 41 astronaut Scott Parazynski 41 hypersonic glider 41 dexterous robots 41 moons orbiting Saturn 41 SSRMS Space Station 41 orbiter Mars Odyssey 41 Pluto Eris 41 polar orbiting satellites 41 Cabeus 41 Kuiper Belt Objects 41 Flight Engineer Suni 41 shuttle aft compartment 41 Jennifer Trosper mission 41 Gerstenmaier 41 SpaceX Dragon spacecraft 41 #P/Churyumov-Gerasimenko 41 Foton spacecraft 41 Schwehm 41 Crewmate Tracy Caldwell 41 preset orbit 41 magnetosphere