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(Click for frequent words.) 65 booster rockets 64 rocket booster 63 solid rocket boosters 61 rocket motors 59 rocket nose cone 58 Solid Rocket Boosters 58 SSMEs 56 rocket thrusters 56 booster rocket 55 spacecraft 55 payload fairing 54 Minotaur rocket 54 SpaceLoft XL 54 RSRMs 53 SRBs 53 Fregat upper stage 53 hydrazine propellant 53 liquid propellants 52 propellant tanks 52 oxidiser 52 spaceward 52 thrusters 52 retrorockets 52 Solid Rocket 52 Ares rocket 52 Taurus XL rocket 52 aft skirt 52 cryogenic engines 52 Titan IVB 52 shuttle orbiter 51 Launch Abort System 51 propellants 51 Atlas Centaur 51 winged spacecraft 51 Atlas 2AS 51 SpaceLoft XL rocket 51 Ares IX rocket 51 liquid propellant 51 propellant 50 robot Dextre 50 hypergolic 50 ion thruster 50 Briz M booster 50 Kosmos 3M 50 spaceplane 50 hypersonic jet 50 DART spacecraft 50 solid propellant 50 Dnepr rocket 50 orbital maneuvering 49 lunar landers 49 heatshield 49 PSLV C6 49 Ariane rocket 49 orbit 49 Orlan spacesuit 49 ion thrusters 48 Martian rovers 48 maneuvering thrusters 48 thruster rockets 48 Briz M 48 toxic hydrazine fuel 48 FASTSAT 48 Pegasus XL 48 GSLV rocket 48 Thiokol 48 micrometeoroids 48 spacecrafts 48 turbopump 48 PSLV rocket 48 Lunar Excursion Module 48 Ariane launcher 48 orbiting 48 Solid Rocket Booster 48 cryogenic propellants 48 Voyager probes 48 Glonass navigation satellites 48 external stowage 48 parafoil 48 Zenit 3SL rocket 48 Centaur upper 47 orbital rendezvous 47 hydrazine toxic 47 drogue parachute 47 ramjets 47 hydrazine fuel 47 deorbited 47 rocket 47 spaceship 47 Nasa spacecraft 47 protruding strips 47 aeroshell 47 ejectable 47 atmospheric reentry 47 Mars Pathfinder lander 47 ramjet 47 IBEX spacecraft 47 solid propellants 47 Curiosity rover 47 payload 47 #/#-ton truss 47 turbopumps 47 liftoff 47 Launch Vehicle 47 Minotaur IV rocket 47 Taurus XL 47 orbiter 47 scramjet engines 47 reentry capsule 47 Zenit 3SL 47 monomethyl hydrazine 47 scramjets 47 Foam insulation 47 Titan 4B 47 cryogenic engine 47 PSLV C# rocket 47 GSLV Mk III 47 oxidizer 46 RL# engine 46 S6 truss 46 Rockot 46 GSLV rockets 46 dummy payload 46 hydrazine thrusters 46 dexterous robot 46 reusable spacecraft 46 CHIPSat 46 SpaceLoft 46 nanosatellites 46 Dextre robot 46 ammonia coolant tank 46 decommissioned Peacekeeper 46 deorbit 46 storable propellants 46 CubeSats 46 spacewalking specialists 46 Japan Kibo laboratory 46 P#/P# truss 46 rocketships 46 nitrogen tetroxide 46 GSAT 5P 46 graphite epoxy 46 Atlas V 46 capsule parachutes 46 liquid hydrogen 46 payloads 46 robotic Canadarm 46 crawler transporter 46 indigenous cryogenic engine 46 launcher 46 Kibo JPM JEM Pressurized 46 geo synchronous 46 lunar rovers 46 cryogenic propellant 46 bi propellant 46 propellant loading 46 Spacehab module 46 spinning gyroscopes 46 liquid oxygen 46 moondust 46 hypersonic glider 45 Russian Orlan spacesuit 45 Molniya M 45 rocket propulsion 45 Exploration Vehicle 45 exoatmospheric kill vehicle 45 pressurized module 45 vulnerable thermal shielding 45 rover Sojourner 45 proton particles 45 Helios 2B 45 Mars landers 45 Ariane launchers 45 PSLV C# 45 thrust vector 45 crewed spacecraft 45 parachutes malfunctioned 45 Permanent Multipurpose Module PMM 45 KSLV 1 45 Space Telescope Imaging Spectrograph 45 SpaceX Falcon 45 exhaust plume 45 spokesman Michael Braukus 45 resistant tiles 45 NASA Ares IX 45 scramjet 45 deorbiting 45 fairing atop 45 Kosmos 3M rocket 45 Neutron stars 45 compressed nitrogen 45 spacecraft thrusters 45 WISE spacecraft 45 liquefied hydrogen 45 moonbase 45 Ares IX 45 Minotaur IV 45 Martian lander 45 Rockot launch 45 Foton spacecraft 45 Joe Vellinga 45 nanosatellite 45 Geeky tweeters 45 flame trench 45 warhead 45 tractor beam 45 ATK Thiokol 45 hypersonic missiles 45 orbiting spacecraft 45 breathing scramjet engine 45 aboard Atlantis 45 undocks 45 NASA Kepler telescope 45 Atlas IIAS 45 satellites orbiting Earth 44 Space Capsule 44 Orion capsule 44 hazardous hydrazine 44 Soyuz spacecraft docked 44 SpaceX Falcon 9 44 Airborne Laser Testbed ALTB 44 Cargo Launch Vehicle 44 Hubble gyroscopes 44 pyrotechnic bolt 44 Canadarms 44 PSLV C9 44 Lunar Rover 44 thruster 44 Martian orbit 44 manned spaceships 44 starboard truss 44 comets asteroids 44 station Quest airlock 44 planetary Transits 44 GSLV D3 rocket 44 tile filler 44 Mike Suffredini NASA 44 Huygens lander 44 unstowed 44 SpaceShip Two 44 Ion propulsion 44 shielding tiles 44 ST5 44 Centaur rocket 44 fairing separation 44 unmanned spacecraft 44 Glonass satellites 44 Orion Crew 44 EELVs 44 Kazakhstan Baikonur Cosmodrome 44 Shuttle Endeavor 44 unmanned probes 44 Orbital Module 44 Vehicle PSLV 44 thermonuclear bombs 44 unpressurized cargo 44 Cape Canaveral Nasa 44 Merlin 1C 44 Sun synchronous orbit 44 ammonium perchlorate 44 Kliper 44 geosynchronous transfer orbit 44 Jupiter Icy Moons 44 spacesuits 44 Taepondong 2 44 rockets 44 stage Naro rocket 44 supercold liquid oxygen 44 warheads 44 orbital velocity 44 DMSP F# 44 Reusable Solid Rocket 44 pad #A 44 Air Force Evolved Expendable 44 External Tank 44 propellent 44 ATK Launch Systems 44 Rockot launcher 44 hypergolic propellants 44 Geosynchronous Satellite Launch Vehicle 44 Soyuz FG 44 space shuttle 44 Discovery thrusters 44 Merlin 1C engines 44 drogue chute 44 gumdrop shaped capsule 44 unpiloted 44 foam 44 CAPE CANAVERAL Astronauts 44 where astronauts resupplied 43 SBSS satellite 43 Dnepr booster 43 supercold liquid hydrogen 43 orbiter robotic arm 43 cryostat 43 suborbital spacecraft 43 geo stationary orbit 43 tile fillers 43 ballistic trajectory 43 antimatter particles 43 float weightlessly 43 Kibo module 43 Spacesuits 43 Shepherding Spacecraft 43 payload fairings 43 Foton M3 43 director Chuck Dovale 43 moonship 43 gaseous hydrogen leak 43 missle 43 Orion spacecraft 43 supersonically 43 suborbital trajectory 43 ion propulsion 43 PSLV C 43 orbital insertion 43 Spacewalkers Scott Parazynski 43 Variable Specific 43 Climate Orbiter 43 vernier engines 43 Shenzhou spacecraft 43 ramjet propulsion 43 Soyuz Fregat 43 GSLV F# 43 photon torpedo 43 Spacecraft 43 Dragon capsule 43 comet particles 43 Kounotori2 43 INSAT 4C 43 urine recycler 43 airlock module 43 George Zamka 43 WhiteKnightTwo WK2 43 scramjet engine 43 LCROSS spacecraft 43 Canada robot Dextre 43 orbiter payload bay 43 Proton Breeze M 43 xenon propellant 43 Geosynchronous Transfer Orbit 43 Early Ammonia Servicer 43 Shuttle Discovery blasts 43 Lockheed Martin Waterton Canyon 43 Logistics Module 43 THEMIS spacecraft 43 Main Engine SSME 43 astronauts Gus Grissom 43 synchronous orbit 43 lander rover 43 steering thrusters 43 Shuttle astronauts 43 Soyuz rocket 43 thruster firings 43 insulating foam 43 foam fragment 43 clumpy soil 43 simulate weightlessness 43 rubber bladders 43 X #A 43 shuttle aft compartment 43 rocket propellants 43 orbiting observatories 43 Orion spaceship 43 hydrogen isotopes 43 rocket propellant 43 Canadarm robotic arm 43 Leonardo Permanent Multipurpose 43 Block 5D 43 Stardust capsule 43 bipod fitting 43 Japanese Kibo laboratory 43 RPCM 43 Konrad Dannenberg 43 Main Engines SSME 43 Elektron oxygen generation 43 Launch Vehicle GSLV 43 NFIRE 43 robotic rovers 43 orbit GTO 43 helium 43 Fincke radioed 43 dirty snowballs 42 Opportunity rovers 42 ion propulsion engines 42 Mars Surveyor 42 Fregat 42 spacewalkers Scott Parazynski 42 MetOp satellite 42 Kapton tape 42 trundle bearing 42 GLAST spacecraft 42 Russian Zvezda module 42 Dyna Soar 42 RazakSAT satellite 42 shepherding spacecraft 42 Russian Dnepr rocket 42 Space shuttle Discovery 42 Orbital Pegasus 42 Cygnus spacecraft 42 Launch Scrubbed 42 Oefelein piloted 42 Pad #B 42 spacewalking repairs 42 Soyuz TMA spacecraft 42 mock warhead 42 lithium hydroxide canisters 42 Satellite Launch Vehicle GSLV 42 thermonuclear weapon 42 heavier payloads 42 composite payload fairing 42 Elektron oxygen generator 42 Orbital Sciences Corp 42 Spacesuit 42 Poisk 42 GPS 2R 42 Venus Climate Orbiter 42 Systems NEX AIQ.H 42 Spacewalking 42 refractors 42 preset orbit 42 lbf thrust 42 planets orbits 42 Launch Pad #B 42 gyroscopes 42 bipod ramp 42 coolant loops 42 lunar missions 42 Thrust reversers 42 oxidizers 42 German dirigible Hindenburg 42 Quest Airlock 42 Stardust spacecraft 42 Discovery undocked 42 Permanent Multipurpose Module 42 lunar spacecraft 42 docking compartment 42 GSLV 42 impactor spacecraft 42 torpedos 42 Shuttle docks 42 highly elliptical orbits 42 Soyuz FG booster 42 SpaceX Dragon 42 launch pad 42 NASAs 42 EGBU 42 impactor 42 shuttle thrusters 42 GPS IIF 42 experienced spacemen 42 Giove B 42 HOUSTON Spacewalking astronauts 42 manned spacecraft 42 VASIMR 42 gaseous hydrogen 42 spacewalkers 42 Martian rover 42 Hubble Space telescope 42 unpressurized 42 Saturn V 42 NCADE 42 Geo synchronous 42 Lunar Module 42 O OREOS 42 lunar module 42 spacesuit 42 balloon gondola 42 supercold propellants 42 Rain overcast sky 42 Space Launch Vehicle 42 propulsion 42 wheeled rover 42 orbital module 42 moons orbiting Pluto 42 hypervelocity 42 Cryosat 42 planetesimals 42 Hayabusa probe 42 planetary embryos 42 magnetic spectrometer 42 NASA rover Spirit 42 Helios Prototype 42 Skynet 5C 42 Cryosat satellite 42 spacewalks astronauts 42 Spacewalkers 42 Insulating foam 42 Impactor 42 martian atmosphere 42 SIRTF 42 capsule 42 GSLV D3 42 robotic landers 42 Vehicle GSLV 42 foam shedding 42 lunar explorer 42 coastal Naro 42 stabilizing gyroscopes 42 indigenous cryogenic stage 42 hydrazine 42 high altitude airship 42 turbojets 42 Volna rocket 42 Astronauts inspect 42 kiloton atomic bomb 42 APXS 42 stub sill 42 NanoSail D 42 Mars Odyssey spacecraft 42 liquid hydrogen LH2 42 Dhanush missile 42 X #As 42 ICC VLD 41 Orbital Express 41 gaseous nitrogen 41 toxic hydrazine 41 Descent Module 41 THAAD interceptors 41 BepiColombo 41 orbiting ISS 41 Moon Impactor Probe 41 MPLM 41 payload canister 41 Geo Synchronous Launch Vehicle 41 giant crawler transporter 41 hypersonic speeds 41 robotic spacecraft 41 magnetic dynamo 41 antimatter atoms 41 interstage 41 copper fortified impactor 41 Terrier Orion 41 orbiters 41 repulsor 41 Orion Ares 41 SuitSat 41 astronauts 41 shuttle Endeavor 41 humanoid robot R2 41 supersonic combustion ramjet 41 ignitors 41 landing VTOL 41 antisatellite weapon 41 Geosynchronous 41 ballistic parachute 41 Shuttle astronaut 41 Bowersox Pettit 41 radioisotope thermoelectric generators 41 Apollo astronauts 41 Dream Chaser 41 Zvezda module 41 INSAT 4CR 41 Pirs docking compartment 41 lunar probes 41 probe Chang'e 41 Insat 4C 41 probe Huygens 41 parahydrogen 41 ERGM 41 Glonass M 41 wheeled rovers 41 parachutes 41 fried circuit breaker 41 Geosynchronous Transfer Orbit GTO 41 hydraulic accumulator 41 dirigibles 41 Shuttle undocks 41 fragile thermal tiles 41 BSMs 41 Breeze KM 41 geo synchronous transfer 41 photon torpedoes 41 Mars Spirit rover 41 experimental payloads 41 Discovery payload bay 41 retrorocket 41 Shuttle Atlantis docks 41 Shenzhou VI capsule 41 X ray telescopes 41 Orbiter MRO 41 windshield wiper maneuver 41 broken gyroscope 41 manned spaceship 41 ECA launcher 41 highly toxic heptyl 41 supercold 41 Naro rocket 41 Bob Ess 41 Skycycle 41 German airship Hindenburg 41 H IIB 41 Churyumov Gerasimenko 41 spacesuit gloves 41 Russian Orlan MK 41 mimics photosynthesis 41 Optus D3 41 ballistic trajectories 41 orbiting telescopes 41 hydrogen 41 space shuttles 41 orange spacesuits 41 thrust oscillation 41 lunar regolith 41 Chang'eI 41 jagged ridge 41 gimbals 41 Reusable Launch Vehicle 41 powerpack 41 NASA 41 lunar orbiter Chandrayaan 41 MQ 1B Predator 41 manned Soyuz 41 Lunar Roving Vehicle 41 GeneSat 1 41 flyby spacecraft 41 gimbaled 41 Constellation Ares 41 Sojourner rover 41 Helios 2A 41 Vehicle ATV 41 airship exploded 41 launchers 41 millisecond pulsars 41 asteroids Ceres 41 stationary lander 41 Jack Swigert 41 Scramjets 41 scramjet powered 41 interstellar particles 41 Mars orbiter 41 Thrusters 41 Moon Mineralogy Mapper M3 41 THEMIS satellites 41 SpaceShip 41 Baikonur Kazakhstan 41 finicky toilet 41 Philae lander 41 space shuttle Discovery 41 Commander Dmitry Kondratyev 41 rocket nozzle 41 intertank region 41 SSPTS 41 tank insulating foam 41 Soyuz launcher 41 starboard SARJ 41 moon landers 41 defective gyroscope 41 vertical stabilizers 41 Pirs airlock 41 blastoff 41 GLONASS M 41 Kwajalein Island 41 NFIRE satellite 41 Crawler Transporter 41 ISS robotic arm 41 SpaceX Dragon capsule 41 orbiter Atlantis 41 orbiting Hubble Space Telescope 41 Virgin Galactic unveils 41 Launch Vehicle EELV 41 GIOVE B 41 chairman K. Radhakrishnan 41 hypersonic scramjet 41 Booster Separation 41 thermonuclear fusion 41 MPCV 41 Morton Thiokol 41 Hellfires 41 igniters 41 steering wheel tilts 41 Kazakhstan Baikonur cosmodrome 41 ATV Johannes Kepler 41 Harmony Node 41 Air Missile AMRAAM 41 cryogenic liquid 41 Soyuz rockets 41 LRO LCROSS 41 Vehicle CEV 41 carry heavier payloads 41 titanium fasteners 41 insulation foam 41 suborbital rocket 41 Crewmate Tracy Caldwell 41 thermonuclear reactions 41 retroreflector 41 Autonomous Rendezvous Technology 41 Orbital Sciences 41 intergalactic spaceship 41 WhiteKnight Two 41 Observatory SDO 41 rocketship 41 geosynchronous satellite launch 41 Spacewalking astronauts 41 spacewalking chores 41 Launch Complex 41 PSLV 41 ECO sensors 41 dummy warhead 41 Endeavour robotic arm 41 Mars rovers Spirit 41 helium nuclei 41 remote sensing satellite Resourcesat 41 lander 41 blastoffs 41 Kounotori 41 H IIA 41 unguided bombs 41 Mercury Redstone 40 Noguchi greeting 40 foot SpaceLoft XL 40 Globalstar satellites 40 Laser COIL 40 pressurized spacesuits 40 lunar module Eagle 40 BomBot 40 #/#-minute climb 40 silica tiles 40 JIMO 40 Sejjil 40 Sejil 40 Rocketplane 40 Viking landers 40 Centre VSSC Thiruvananthapuram 40 onboard Chandrayaan 40 shuttle Atlantis 40 NEOSSat 40 Manned Maneuvering Unit 40 fiery reentry 40 System GMLRS 40 Spacehab 40 Interplanetary Internet 40 lunar orbit 40 infrared observatory 40 commander George Zamka 40 Orbiting Carbon Observatory 40 supercold fuel 40 icy comets 40 Lunar Orbiter 40 GUCP 40 engineless 40 Satellite Launch Vehicle 40 Kenneth Ham 40 butane cartridge 40 Mars Opportunity rover 40 orb weaving spiders 40 tokamaks 40 supercooled liquid 40 protruding thermal 40 Thruster 40 icy moons 40 Gundams 40 malfunctioning rotary joint 40 Zeta Ophiuchi 40 interplanetary spacecraft 40 kinetic warhead 40 spokesman Igor Panarin 40 shuttle thermal tiles 40 manager Mike Suffredini 40 samarium cobalt magnets 40 astronaut Joseph Acaba 40 NASA Lunar Prospector 40 radioisotope thermoelectric generator 40 triangular Mylar sails 40 Plesetsk Cosmodrome 40 Shuttle Carrier 40 geo synchronous orbit 40 geo synchronous satellite 40 Ariane 5G 40 shuttle Endeavour astronauts 40 laboratory Kibo 40 LO2 40 Shuttle Challenger 40 interceptor missile 40 Canadian robot Dextre 40 comet dust 40 Oleg Kononenko 40 Orion CEV 40 Lunar Prospector 40 ablator 40 Naro Space Centre 40 Bell Aerosystems 40 Leonardo Multi Purpose 40 TDRS K 40 moons orbiting 40 Cosmodrome 40 Scramjet 40 multistage missile 40 Heidemarie M. 40 Astronauts Install 40 Commander Charlie Hobaugh 40 SLC 3E 40 lunar soil 40 Propane tanks 40 ammonia crystals 40 robotic rover Spirit 40 aboard Taurus XL 40 chemical hydride 40 tanks gyroscopes 40 spaceships 40 robotic explorer 40 fiberglass tub 40 shuttle 40 infrared telescope 40 kg payload 40 VSS Enterprise 40 propeller blade 40 shuttle middeck 40 Deep Impact comet 40 Geo IK 40 Pete Siebold 40 supersonic combustion 40 plutonium dioxide 40 shuttle underbelly 40 rover Curiosity 40 foam insulation peeled 40 Ramjet 40 space shuttle Endeavour 40 Shuttle Discovery docks 40 zirconium alloy 40 twin rovers Spirit 40 spacewalking astronaut accidentally 40 Trishul missile 40 Ariane 5 40 SpaceDev Dream Chaser 40 Mars Atmosphere 40 lightning arrestor 40 helium atoms 40 Promontory Utah 40 Hydratus 40 sonde 40 protruding filler 40 nosecone 40 commander Leroy Chiao 40 Atlantis Undocks From 40 missile 40 NASA twin rovers 40 accretion disks 40 CryoSat satellite 40 Orbital 40 rubber gasket 40 isotope deuterium 40 breathing supersonic combustion 40 Systems TSX AIQ 40 Opportunity Mars rovers 40 EZ Rocket 40 redock 40 micrometeoroid impacts 40 spacecraft Chandrayaan 1 40 INSAT 4A 40 Jupiter Ganymede 40 VASIMR engine 40 Express AM# 40 Plane OSP 40 Orbital Sciences Taurus 40 Cosmonaut Gennady Padalka 40 stony meteorite 40 Cosmonauts Sergei Volkov 40 spaceflyers 40 cutoff ECO 40 strangelets 40 electric ion propulsion 40 infrared telescopes 40 Russian cosmonaut Alexander Kaleri 40 ALMA antennas 40 Bulava missile 40 Jules Verne Automated Transfer 40 rigid polyurethane 40 KSLV 40 refueling hose 40 gelatinous mass 40 earth orbiting satellites 40 Space Shuttle 40 Lunar CRater Observation 40 howitzer shells 40 HTV2 40 pyrotechnically 40 radial piston 40 Iridium satellites 40 gyroscope 40 supernovae explosions 40 meteoroid 40 liquid oxygen LOX 40 MLRS rockets 40 engineer Oleg Kotov 40 Buzz Lightyear doll 39 THEL 39 Hayabusa 39 spacewalking astronaut gently 39 Soyuz spaceship 39 Chandrayaan II 39 piezoelectric ceramic 39 satellites 39 Cosmonaut Pavel Vinogradov 39 ammonia tank 39 Vehicle MPCV 39 Endeavour payload bay 39 sponsons 39 backshell 39 Baikonour 39 rotary joints 39 Soyuz capsule 39 Earth orbit LEO 39 sodium alanate 39 superhot gases 39 Orbital Maneuvering System 39 Orbiter LRO 39 entrepreneur Elon Musk 39 canisters 39 ton truss 39 hydrogen helium 39 Sea Skua 39 main rotor blade 39 deuterium tritium 39 ballistic missile interceptor 39 Solar TErrestrial RElations Observatory 39 electrolyze water 39 exosphere 39 Big Bang collider 39 Soyuz spacecraft 39 particle physics detector 39 asteroids comets 39 nano satellites 39 rotating neutron stars 39 spokesman Rob Navias 39 Lunar Module Pilot 39 NASA Gamma ray 39 Jules Verne ATV 39 sun synchronous orbit 39 stratospheric airship 39 shuttle Canadarm 39 Commander Rick Sturckow 39 Space shuttle Atlantis 39 functioning gyroscopes 39 Spirit Mars rover 39 breadbox sized 39 Russians Alexander Kaleri 39 fission reactions 39 igniter 39 China homemade Feitian 39 RQ 4B 39 gaseous 39 Vehicle PSLV rocket 39 thermos bottle 39 Terrestrial Planet Finder 39 Guided Multiple 39 rocketeers 39 makeshift hacksaw 39 Solar Arrays 39 shuttle airlock 39 Resourcesat 2 39 adventure Zamka 39 lb payload 39 meta atoms 39 THEMIS probes 39 CH #D helicopter 39 KillerBee 39 mothership WhiteKnightTwo 39 Scott Parazynski 39 Ares I. 39 cosmonaut Alexander Kaleri 39 NextSat 39 torpedo tubes 39 Soyuz 39 crystal lattices 39 CAPE CANAVERAL FLORIDA 39 P6 4B 39 Nasa 39 Minuteman intercontinental ballistic missile 39 unpowered 39 heaviest payloads 39 Arabsat 5A 39 molten magma 39 Cape Canaveral 39 Impact Probe MIP 39 lunar lander 39 OMS pods 39 NPO Lavochkin 39 Rick Linnehan 39 ILS Proton Breeze 39 Guenter Wendt 39 shuttlecraft 39 geostationary transfer 39 Shuichiro Yamanouchi 39 Atlantis undocks 39 al Samouds 39 countdown dress rehearsal 39 Phoenix Mars lander 39 uncrewed 39 protostar 39 spacecraft Cassini 39 unmanned Chandrayaan 39 unreadable astronaut 39 NASA rovers 39 multistage rocket 39 orbital debris 39 Saturn Cassini 39 Microgravity Science Glovebox 39 X #A scramjet