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(Click for frequent words.) 60 orbit insertion 60 orbital insertion 58 thruster firings 57 ion propulsion 56 lunar orbit 56 GOCE 56 hypersonic speeds 56 orbital maneuvers 55 MARSIS 55 highly elliptical orbit 55 orbital rendezvous 55 deorbit 54 spacecraft 54 electric ion propulsion 54 drogue parachute 54 MARSIS radar 54 Curiosity rover 53 instrument calibrations 53 orbit 53 radio occultation 53 thruster 53 rocket thrusters 53 Mars Pathfinder lander 53 Cassini Huygens 52 comet flyby 52 NASA Stardust spacecraft 52 Foton M2 52 Titan flybys 52 reboost 52 Mars Reconnaissance Orbiter MRO 52 Stardust spacecraft 52 Martian orbit 52 Martian atmosphere 52 Stardust NExT 51 spacecraft Chandrayaan 1 51 retrorockets 51 Crewmate Tracy Caldwell 51 deorbiting 51 hypersonic flight 51 planetary flybys 51 orbiter 51 Hubble orbits 51 Churyumov Gerasimenko 51 LEOP 51 Ares IX rocket 51 SIRTF 51 Philae lander 51 Yarkovsky effect 50 rover Spirit 50 Kibo robotic arm 50 Solid Liquid Mixtures 50 flybys 50 Jules Verne ATV 50 Orbital Express 50 deorbit burn 50 Huygens Probe 50 flyby spacecraft 50 Lunar Reconnaissance Orbiter LRO 50 Investigation DIXI 50 MESSENGER 50 navigate autonomously 50 circular orbit 50 spacewalks astronauts 50 unstowed 50 Stardust capsule 50 thrusters 50 Andrey Borisenko 50 Mercury flyby 50 NuSTAR 50 Mars orbiting spacecraft 50 mesosphere 50 scramjets 50 perihelion 50 extravehicular activities 50 sols 50 orbiting observatories 49 enters lunar orbit 49 interplanetary missions 49 Mars Reconnaissance Orbiter 49 MARSIS instrument 49 propellant loading 49 Jupiter flyby 49 Jupiter Icy Moons 49 Stardust NExT mission 49 OSIRIS REx 49 microgravity experiments 49 #/#-hour spacewalk [001] 49 Rosetta spacecraft 49 elongated orbit 49 orbital 49 THEMIS Images 49 geosynchronous orbit 49 Chang'eI 49 closest flyby 49 scramjet 49 NanoSail D 49 NASA Spirit rover 49 Eyharts 49 irregularly shaped asteroid 49 LISA Pathfinder 49 Orbiter 49 Skripochka 49 APXS 49 gravitational slingshot 48 Ares IY 48 lunar orbiter 48 unplanned spacewalk 48 Planck spacecraft 48 Saturn Cassini 48 lander 48 NASA MESSENGER spacecraft 48 Nasa spacecraft 48 Hayabusa probe 48 Martian surface 48 Comet #P/Churyumov-Gerasimenko 48 ESA Huygens probe 48 Interstellar Boundary Explorer 48 NASA twin rovers 48 BepiColombo 48 orbiting spacecraft 48 Mars Opportunity rover 48 LRO 48 crewed spacecraft 48 orbits 48 Ranging spacecraft 48 EPOXI mission 48 MESSENGER spacecraft 48 Shuttle Atlantis blasts 48 ballistic trajectory 48 robotic lander 48 Messenger spacecraft 48 pericentre 48 Earth orbit 48 unstowing 48 geo synchronous transfer 48 Phobos Grunt 48 Helios 2B 48 dexterous robot 48 MetOp 48 Orbiter MRO 48 DEPTHX 48 SIM PlanetQuest 48 martian surface 48 KAGUYA 48 robotic spacecraft 48 Opportunity rovers 48 Orbiter LRO 48 Discovery undocks 48 windshield wiper maneuver 48 #P/Churyumov-Gerasimenko 48 IBEX spacecraft 48 spokesman Michael Braukus 47 martian atmosphere 47 planetary Transits 47 asteroid Vesta 47 ESA Mars 47 probe Chang'e 47 NASA Cassini spacecraft 47 TappingMode 47 countdown dress rehearsal 47 Planetary Fourier Spectrometer PFS 47 Gravity Probe 47 O OREOS 47 simulate weightlessness 47 JIMO 47 duration spaceflights 47 suborbital trajectory 47 orbiting telescope 47 Yinghuo 1 47 JAXA 47 Ulysses spacecraft 47 Human Spaceflight Microgravity 47 shuttle Atlantis astronauts 47 Comet Hartley 2 47 ExoMars rover 47 microgravity environment 47 New Horizons spacecraft 47 Cassini 47 Chandrayaan II 47 parabolic trajectory 47 WISE spacecraft 47 PSLV rocket 47 Soyuz landings 47 rover Opportunity 47 Dominic Gorie 47 robotic rovers 47 Ocean Salinity SMOS 47 unmanned probes 47 flyby Cassini 47 CALIPSO 47 DMSP F# 47 Gerhard Schwehm 47 Mars rovers Spirit 47 Shuttle Discovery undocks 47 Huygens mission 47 Discovery undocking 47 Ed Weiler NASA 47 Vehicle ATV 47 parafoil 47 celestial observations 47 UA Lunar 47 simulated weightlessness 47 Cryosat 47 austral summer 47 Stephanie Stilson NASA 47 NASA 47 HiRISE camera aboard 47 comet Hartley 2 47 spacewalk Stefanyshyn Piper 47 EPOCh 47 crewed missions 47 spacecraft SpaceShipTwo 47 Commander Sergei Volkov 47 Hubble 47 WISE telescope 47 Mars orbiter 47 flyby 47 ICESat 47 CDR SO 47 elliptical orbit 46 FASTSAT 46 Russian cosmonaut Alexander Kaleri 46 Huygens descent 46 EPOXI 46 waning gibbous 46 scramjet engine 46 perilune 46 Hubble Space Telescope HST 46 Itokawa 46 Ares rocket 46 Saturnian moon Titan 46 laser altimeter 46 comet chaser 46 cryogenic propellants 46 Herschel Space Telescope 46 Red Planet 46 Airborne Laser Testbed 46 scramjet engines 46 circularize 46 Gravity Probe B 46 Weightless Wonder 46 twin rover Spirit 46 Atlantis undocks 46 WMAP satellite 46 LADEE 46 hydrazine thrusters 46 SSRMS Space Station 46 ESA Rosetta 46 Shepherding Spacecraft 46 asteroid deflection 46 PSLV C9 46 Titan flyby 46 particle acceleration 46 Heterodyne Instrument 46 airspeeds 46 EVAs 46 Foton M3 46 postflight 46 Hubble Space telescope 46 elliptical orbits 46 planetary missions 46 swingby 46 fairing separation 46 NASA Lunar Crater 46 JWST 46 Atlantis Undocks From 46 HiRISE 46 engineer Salizhan Sharipov 46 magnetotail 46 ESA ASI 46 Rendezvous Pitch Maneuver 46 reusable spacecraft 46 Cassini Huygens spacecraft 46 Shenzhou spacecraft 46 LASP 46 extravehicular activity EVA 46 SMOS mission 46 sun synchronous orbit 46 Launch Abort System 46 commander Leroy Chiao 46 occultations 46 perigee 46 flea hop 46 orbited Jupiter 46 Webb Telescope 46 Shuttle astronauts 46 Mars Orbiter 46 GSLV Mk III 46 ADM Aeolus 46 polar orbit 46 Hubble Servicing 46 Kepler spacecraft 46 Rosetta orbiter 46 THEMIS satellites 46 comet Churyumov Gerasimenko 46 Oleg Ivanovsky 46 Kepler Mission 46 ESA Huygens 46 Chuck Dovale 46 Sirangelo 46 Hayabusa spacecraft 46 Martian rover 46 Extra Vehicular Activity 46 Deep Impact Extended 46 asteroid Itokawa 46 Foton spacecraft 45 Mercury flybys 45 astro comb 45 twin rover Opportunity 45 ion thrusters 45 Heidemarie M. 45 STEREO spacecraft 45 airglow 45 Mössbauer spectrometer 45 GOCE satellite 45 particle beam 45 SMOS 45 Barry Butch Wilmore 45 gaseous hydrogen 45 supersonic combustion ramjet 45 AMASE 45 NEOSSat 45 De Winne 45 Flyby 45 Big Bang collider 45 station Quest airlock 45 robotic arm 45 Saturn Orbit Insertion 45 Explorer WISE 45 Mars Climate Sounder 45 tumbleweed rover 45 LCROSS 45 Mars 45 martian 45 Comet Churyumov Gerasimenko 45 Near Infrared Camera 45 Enceladus flyby 45 entered lunar orbit 45 Lunar Module 45 ion thruster 45 martian soil 45 Cassini Equinox 45 Rex Geveden 45 lunar orbit insertion 45 hypergolic 45 HRSC 45 Mars Lander 45 Fregat upper stage 45 microscopic imager 45 Space ENvironment GEochemistry 45 Shenzhou IV 45 Charles Elachi director 45 Martian arctic plain 45 AJ# engine 45 Krimigis 45 propellant 45 geo synchronous 45 spacecraft Cassini 45 robotic explorer 45 William Readdy NASA 45 Express orbiter 45 polar vortex 45 Alexander Samokutyayev 45 orbiting observatory 45 axial tilt 45 J 2X 45 Lunar Prospector 45 comet #P/Churyumov-Gerasimenko 45 gaseous planet 45 lunar missions 45 Galileo spacecraft 45 manned lunar landing 45 Jovian moons 45 Soyuz #S 45 lunar orbiter Chandrayaan 45 zeolite membranes 45 shuttle missions 45 Earth orbit LEO 45 Compton Gamma Ray 45 Sun synchronous orbit 45 orbital velocity 45 asteroid Steins 45 SELENE probe 45 starboard SARJ 45 cryogenic temperatures 45 tropopause 45 unmanned lunar orbiter 45 Space Shuttle STS 45 equatorial latitudes 45 robotic geologist 45 PASADENA Calif. NASA 45 comet orbital 45 mineralogical mapping 45 urine recycler 45 Padalka 45 propulsion subsystem 45 lunar soil 45 Earth gravitational pull 45 Spirit Mars rover 45 Hakan Svedhem 44 Mars Color Imager 44 Quest airlock 44 Mars Pathfinder 44 Stardust mothership 44 NASA EPOXI mission 44 GIOVE B 44 NFIRE satellite 44 Robotic Arm 44 Mercury retrograde 44 MetOp satellite 44 atmospheric reentry 44 parahydrogen 44 orbiting Hubble Space Telescope 44 lunar explorer 44 Herschel Planck 44 HiRISE camera 44 High Resolution Imaging 44 preset orbit 44 Jules Verne Automated Transfer 44 astrometry 44 manned lunar landings 44 Mars Odyssey spacecraft 44 Hubble servicing 44 comet dust 44 Commander George Zamka 44 Mike Leinbach shuttle 44 Shuttle Docks 44 orbital altitude 44 Viking landers 44 sputter deposition 44 Space Infrared Telescope 44 Sputnik beeped 44 ammonia flakes 44 Kepler 9c 44 Pirs module 44 Rich Zurek 44 Interior Laboratory GRAIL 44 HB SIA 44 changeout 44 Budarin 44 Space Shuttle Program 44 NASA THEMIS 44 Flight Readiness 44 Krikalev 44 Flight Engineer Suni 44 Martian arctic 44 Laboratory MSL 44 astronauts Acaba 44 Y1A 44 SDACS 44 SSMEs 44 Mammography Mammography 44 Readiness Review 44 SBSS satellite 44 GEochemistry 44 ESA SMOS 44 Shuttle Endeavor 44 NASA rovers 44 spreadable consistency 44 Jupiter Icy Moons Orbiter 44 Shallow Subsurface Radar 44 prelaunch preparations 44 liquid coolant 44 autorotation 44 Rover MER 44 neutral mass spectrometer 44 shuttle Discovery STS 44 SolarEagle 44 SPICAM 44 gamma ray observatory 44 xenon propellant 44 MAVEN 44 orbiting 44 supercritical fluids 44 Infrared Pathfinder Satellite 44 drogue chute 44 lunar probe 44 TEGA instrument 44 remote sensing instruments 44 infrared spectrograph 44 David Southwood ESA 44 exosphere 44 Descent Imager Spectral Radiometer 44 Mastcam 44 ablator 44 Preston Burch 44 interstellar particles 44 ExoMars mission 44 Shuttle Endeavour blasts 44 Lunar Orbiter 44 Dan Durda 44 geo stationary orbit 44 Jupiter icy moons 44 ionisation 44 ESA Herschel 44 laser altimetry 44 crewmate Tracy Caldwell 44 orbiter robotic arm 44 Endeavour robotic arm 44 synchronous polar 44 Globalstar satellites 44 lunar orbits 44 GOES O 44 GPS IIF 44 VIRTIS 44 Climate Sounder 44 aeroshell 44 ESOC 44 Kononenko 44 NASA Ares IX 44 Required Navigation Performance RNP 44 polar plateau 44 Svedhem 44 Centaur rocket 44 NASA rover Spirit 44 Huygens probe 44 Martian terrain 44 COROT 44 sulphate aerosols 44 Huygens 44 lunar perigee 44 ISS Expedition 44 PSLV C# 44 HEO payload 44 Deep Impact spacecraft 44 grueling spacewalks 44 LRO LCROSS 44 Discovery astronauts 44 commander Frederick Sturckow 44 polar orbits 44 Vostok spacecraft 44 rock abrasion 44 Wallops Island Va. 44 Crawler Transporter 44 Fuk Li Mars 44 HD#b 44 spacesuit malfunction forced 44 Esrange 44 Global Precipitation Measurement 44 lunar landers 44 commander George Zamka 44 ChemCam 44 shuttle Discovery undocked 44 autonomous rendezvous 44 rhythmic contractions 44 stellar occultation 44 recalled Seymour Himmel 43 PSLV C 43 retroreflector 43 spacecrafts 43 Mars# 43 NASA Mars rover 43 commander Sergei Volkov 43 John Callas rover 43 Deep Impact probe 43 GSLV D3 43 YES2 43 stellar occultations 43 Binary Colloidal Alloy 43 indigenous cryogenic stage 43 Planck satellite 43 equatorial orbit 43 LORRI 43 circular orbits 43 sister rover Spirit 43 Opportunity rover 43 shuttle thermal tiles 43 Japan Kibo laboratory 43 Lunar Orbit 43 radial velocity 43 engineer Garrett Reisman 43 NASA Stratospheric Observatory 43 Comet Hartley 43 Minotaur IV 43 Spacehab module 43 waxing gibbous 43 Orbiter Processing Facility OPF 43 adaptive optics 43 Joint Expeditionary Force 43 gravitational microlensing 43 Ares IX 43 spacewalk 43 shuttle thrusters 43 NASA MESSENGER 43 aboard Atlantis 43 Foton M3 mission 43 Crew Launch Vehicle 43 parabolic maneuvers 43 NFIRE 43 Rick Linnehan 43 ARCTUS 43 innermost planet 43 microgravity 43 Comet Tempel 1 43 aboard Skylab 43 parabolas 43 orbital module 43 Saturn moon Mimas 43 bedrock outcropping 43 Thrusters 43 Shenzhou VI craft 43 Carl Marchetto 43 PSLV C6 43 CHIPSat 43 SpaceShip Two 43 Convection Rotation 43 Craig Tooley LRO 43 orbiter lander 43 CX OLEV 43 keyhole incisions 43 Pilot George Zamka 43 Mercury exosphere 43 Kaleri 43 lander rover 43 Comet 9P/Tempel 1 43 radar interferometry 43 ultraprecise 43 Nasa 43 Atom smasher 43 Viking Lander 43 NASA rovers Spirit 43 upper troposphere 43 balky bolt astronauts 43 discover Fomalhaut 43 Astronaut Gregory Chamitoff 43 retrograde orbit 43 Ares I. 43 Kibo JPM JEM Pressurized 43 submillimeter wavelengths 43 supercomputer simulations 43 Soyuz rocket 43 Mars rovers Opportunity 43 six wheeled rover 43 ionosphere 43 Roman Romanenko 43 NASA Far Ultraviolet 43 substorm 43 Yuri Lonchakov 43 NASA Cassini 43 GPS IIR M 43 detect gravitational waves 43 interplanetary spacecraft 43 Jean Pierre Lebreton Huygens 43 Lander robotic arm 43 NASA STEREO 43 Soyuz spacecraft docked 43 orbital eccentricity 43 Endeavour STS 43 Comet Boethin 43 orbiting Mars 43 Atlas 2AS 43 maneuvering thrusters 43 Mars Atmosphere 43 Ryschkewitsch 43 Mars rover Opportunity 43 Magnetospheric 43 MSG Microgravity Science Glovebox 43 shepherding spacecraft 43 NASA Weightless Wonder 43 spaceflights 43 Orionids 43 Mössbauer 43 monomethyl hydrazine 43 MESSENGER MErcury Surface 43 Commander Charlie Hobaugh 43 onboard Chandrayaan 43 Martian soil 43 planets orbits 43 Russian cosmonauts 43 outer planets 43 hypersonic scramjet 43 KODAK CCD Image Sensors 43 Fomalhaut b 43 Characterization EPOCh 43 STORRM 43 robotic explorers 43 Samokutyayev 43 Daniel Sacotte ESA 43 CAPE CANAVERAL Shuttle Discovery 43 ISS crewmember 43 breathing supersonic combustion 43 CDR Padalka 43 orbiters landers 43 PSLV C7 43 geosynchronous 43 Phoenix Mars Lander 43 planetary atmospheres 43 Flyby spacecraft 43 NASA Mars Reconnaissance 43 star IM Pegasi 43 propellant tanks 43 crawler transporter 43 thermochemical nanolithography 43 NextSat 43 Science Experiment HiRISE 43 Proba 2 43 photochemical reactions 43 Shuttle Atlantis undocks 43 Microscopy Electrochemistry 43 Servicing Mission 43 magnetic reconnection 43 Interplanetary Internet 43 Rick Grammier Deep Impact 43 Mars lander 43 ISS crewmembers 43 Space Capsule 43 Europa Orbiter 43 Phoenix lander 43 Progress resupply 43 Resolution Instrument 43 THEMIS spacecraft 43 Giove B 43 geyser plumes 43 NEAR Shoemaker 43 Antenna LISA 43 wheeled rover 43 Rosetta comet chaser 42 KA SAT satellite 42 STSS Demo 42 MPLM 42 DISR 42 Sensing Satellite LCROSS 42 SpaceX Falcon 9 42 solar corona 42 thruster rockets 42 Martian moons Phobos 42 Mars CRISM 42 GPS IIF satellites 42 TEGA oven 42 sun corona 42 unmanned lunar 42 Itokawa asteroid 42 Shuttle Endeavour docks 42 Cosmonauts Sergei Volkov 42 Pad Abort 1 42 EchoStar XV 42 heatshield 42 NASA MErcury Surface 42 manœuvres 42 Ngo Anh 42 cobalt atom 42 radiometric measurements 42 geosynchronous transfer 42 ballistic descent 42 Lyndin 42 Jupiter moons 42 Orion LAS 42 Martian arctic plains 42 centrifugation 42 Global Surveyor 42 Chodas 42 magma ocean 42 Russian Mikhail Tyurin 42 Pete Theisinger 42 International Space Station 42 astronaut Andrew Feustel 42 CryoSat mission 42 Commander Rick Sturckow 42 Mossbauer spectrometer 42 Endeavour docked 42 tipping precariously 42 Pad #B 42 airfoils 42 Vibration Isolation 42 pretreatments 42 Hubble Space Telescope 42 Vehicles Directorate 42 Terrestrial Planet Finder 42 GSLV rocket 42 Charles Elachi 42 spaceplane 42 Caldwell Dyson 42 arctic plains 42 orbit GEO 42 Discovery STS 42 impactor spacecraft 42 deglazing 42 Jupiter magnetosphere 42 Yuri Shargin 42 legged lander 42 Pegasus XL 42 ESA ERS 42 orbital laboratory 42 ST5 42 cryogenic cooling 42 uncrewed 42 Russian Valeri Polyakov 42 Professor Pillinger 42 Earthward 42 Milstar II 42 Mars Surveyor 42 Oefelein piloted 42 chromatographic separations 42 NEOWISE 42 cashless cabins 42 NASA Deep Impact 42 Commander Eileen 42 radial velocity technique 42 MErcury Surface Space ENvironment 42 Space Shuttle Atlantis 42 lunar regolith 42 Rosetta lander 42 comet Boethin 42 STOVL mode 42 Atlantis payload bay 42 gradiometer 42 Terminal Countdown Demonstration 42 Shuttle undocks 42 Air Force Evolved Expendable 42 icy moons 42 telescopic observations 42 Ron Garan 42 Kibo module 42 pre docking backflip 42 shuttle Endeavour STS 42 Venusian surface 42 Phoenix Microscopy Electrochemistry 42 LSAM 42 circumlunar 42 Mike Leinbach 42 simulated lunar 42 planetesimals 42 Apollo missions 42 Altair lunar lander 42 extravehicular 42 X #A 42 Titan smoggy 42 broken coolant pump 42 e VLBI 42 probe Huygens 42 Astro E2 42 Endeavour undocks 42 SOLO TREC 42 GLAST spacecraft 42 robotic submersibles 42 Moessbauer spectrometer 42 Chris Scolese 42 spectroscopic analysis 42 Greg Chamitoff 42 Planetary Transits 42 Spacewalks 42 lunar surface 42 coronagraph 42 Adaptive optics 42 Keck Interferometer 42 vomit comet 42 Atlantis STS 42 VASIMR 42 unpowered glider 42 spacewalks 42 TanDEM X 42 Gorie 42 DART spacecraft 42 Hubble observations 42 makeshift hacksaw 42 twin Voyager spacecraft 42 unmanned spacecraft 42 Bob Thirsk 42 Resolution Imaging 42 scatterometer 42 Assembly Building VAB 42 interfacial tension 42 Stratospheric Observatory 42 Observatory SDO 42 astronauts Scott Parazynski 42 conching 42 Alexey Sitev 42 J 2X engine 42 aphelion 42 SpaceX Dragon capsule 42 CRISM 42 Son Nghiem 42 Cygnus spacecraft 42 Bruce Banerdt 42 YORP effect 42 Vehicle CEV 42 LVLH 42 hourlong descent 42 Fregat 42 Galilean satellites 42 Andre Borschberg 42 manned lunar voyage 42 Deep Impact eXtended Investigation 42 supercooling 42 Liquid Apogee Motor 42 Lunar Reconnaissance Orbiter 42 TDRS K 42 Cosmonauts Fyodor Yurchikhin 42 Rosaviakosmos 42 layered outcrops 42 attosecond 42 Martian moon Phobos 42 IceCube 42 undocks 42 Epoxi 42 ISS resupply 42 Stadermann 42 undersea glider 42 shuttle Discovery 42 Cosmodrome 42 COROT 7b 42 suborbital flight 42 Robotic Arm Camera 42 LOCAD PTS 42 comet nucleus 42 planet orbits 42 rover robotic arm 42 Replied Endeavour commander 42 Mercury Uranus 42 Soyuz capsule 42 Jean Luc Margot 42 thin crescent 42 CloudSat 42 Asteroid Itokawa 42 orbiting astronauts 42 astronaut Scott Parazynski 42 geosynchronous satellites 42 clumpiness 42 lunar module Eagle 42 Lunar Surface 42 Mars rover 42 Tempel 1 42 Composite Infrared Spectrometer 42 Pirs Docking Compartment airlock 42 ISS robotic arm 42 comets orbiting 42 Malenchenko 42 linkup Endeavour 42 lunar orbiter Chang'e 42 Space Telescope Imaging Spectrograph 42 Orion spacecraft 42 spacewalking astronauts 42 cryogenically cooled 42 Shenzhou VII 42 shuttlecock shaped capsule 42 rover 42 Shuttle Discovery docks 42 Atlantis astronauts 42 Russian cosmonauts Andrei Borisenko 42 Infrared Astronomy 42 Atlantis robotic arm 42 situ measurements 42 SHARAD 42 Microgravity 42 gamma ray observatories 42 fuller rotational 42 NASA Kepler telescope 42 supersonic combustion 42 shuttle Endeavor 41 SOHO spacecraft 41 Launch Pad #B 41 mission Chandrayaan 41 Commander Gennady Padalka 41 rover Curiosity 41 ESA GOCE 41 lunar orbiters 41 Eta Aquarid meteor shower 41 budging Wheelock told 41 Shuttle Atlantis 41 comet Wirtanen 41 Cancri e 41 Wakata 41 Cloud Aerosol Lidar 41 Deep Impact craft 41 Ultraviolet Imaging Spectrograph UVIS 41 orbiting Kepler telescope 41 WFPC2 41 astronaut Heidemarie Stefanyshyn Piper 41 millisecond pulsar 41 ATV Johannes Kepler 41 simulated Martian 41 Mars orbiters 41 Infrared Astronomy SOFIA 41 Grammier 41 astrometric 41 Benthic Rover 41 WISE mapped 41 twin rovers Spirit 41 Meteorological Satellite 41 shuttle undocks 41 spacecraft orbited 41 ESA SMART 41 Cassini flyby 41 CMGs 41 Spacecraft Operations 41 asteroidal 41 robotic landers 41 highly elliptical orbits 41 alpha particle X ray 41 Eagle lunar lander 41 Imaging Spectrograph 41 orbit GTO 41 Lt. Col. Yang Liwei 41 parachute deploys 41 Volatile Evolution 41 Jennifer Trosper mission 41 Space Shuttle Discovery 41 Phoenix Mars lander 41 Horizons spacecraft