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(Click for frequent words.) 61 reentry capsule 59 impactor spacecraft 55 copper impactor 54 Curiosity rover 54 comet Churyumov Gerasimenko 54 impactor 53 #P/Churyumov-Gerasimenko 53 WISE spacecraft 52 Foton M3 52 Comet #P/Churyumov-Gerasimenko 52 lander rover 51 Multi Purpose Logistics Module 51 comet hurtling 51 Hayabusa spacecraft 51 Rosetta lander 51 Philae lander 51 asteroid Itokawa 50 Stardust spacecraft 50 Stardust mothership 50 geo synchronous 50 Saturn Cassini 50 Martian rovers 50 Martian orbit 50 ammonia coolant tank 50 clumpy soil 50 Churyumov Gerasimenko 50 Sojourner rover 49 Earth asteroid Itokawa 49 Virgin Galactic SpaceShipTwo 49 Virgin Galactic unveils 49 Comet 9P/Tempel 1 49 SpaceLoft XL rocket 49 payload fairings 49 Astronaut Randolph Bresnik 49 Hale Bopp comet 49 VY Canis Majoris 49 Meridiani plains 49 capsule parachuted 49 NASA Lunar Prospector 49 hypergolic 49 airlock module 49 comet #P/Churyumov-Gerasimenko 49 Phobos Grunt 49 retroreflector 49 robotic explorer 49 sized impactor 48 shuttle aft compartment 48 pressurized module 48 Rockot launch 48 Deep Impact flyby spacecraft 48 Comet Tempel 1 48 lunar soil 48 NASA Stardust spacecraft 48 orbiting 48 comet dust 48 onrushing comet 48 IBEX spacecraft 48 planetary Transits 48 Atlantis undocks 48 ATV Johannes Kepler 48 Japan Hayabusa spacecraft 48 Yinghuo 1 48 Spacehab module 48 GSLV rocket 48 comet chaser 48 pyrotechnic bolt 48 interstellar particles 48 Hayabusa probe 48 MESSENGER spacecraft 48 Galileo spacecraft 48 Apollo missions 48 Bonneville Crater 48 Fomalhaut b 47 ESA GOCE 47 interstellar dust samples 47 Mars Pathfinder lander 47 thruster rockets 47 Nasa Deep Impact 47 orbiting Kepler telescope 47 Itokawa asteroid 47 Stardust capsule 47 orbital rendezvous 47 dexterous robot 47 robotic Canadarm 47 Deep Impact spacecraft 47 Mars rovers Opportunity 47 comet Tempel 1 47 cometary debris 47 protoplanet 47 solidified lava 47 duration spaceflights 47 Kounotori2 47 aboard Taurus XL 47 Mars Reconnaissance Orbiter MRO 47 unmanned rover 47 Nasa Mars Reconnaissance 47 comet flyby 47 Deep Impact probe 47 DMSP F# 47 Deep Impact comet 47 rocket thrusters 47 wife commissioned Celestis 47 podlike 47 PSLV C6 47 Shenzhou VI spacecraft 47 asteroid hurtling 47 Lunar CRater Observation 47 whiz harmlessly 47 lander Philae 47 humanlike robot 47 hypervelocity 47 Mini Thermal Emission 47 float weightlessly 47 centimeter wingspan 47 comets asteroids 47 rocket nose cone 47 geo synchronous transfer 47 unmanned Shenzhou 47 Jupiter Ganymede 47 subsurface ocean 46 P Churyumov Gerasimenko 46 twin rover Opportunity 46 comet particles 46 rotational axis 46 Progress resupply 46 elongated orbits 46 Shepherding Spacecraft 46 Voyager probes 46 Gusev crater 46 Centaur rocket 46 crewed spacecraft 46 manned Shenzhou 46 unmanned Progress 46 Space Capsule 46 retrorockets 46 Shenzhou spacecraft 46 Upsilon Andromedae b 46 lunar module Eagle 46 EPOXI spacecraft 46 Shenzhou V spacecraft 46 Spirit Mars rover 46 maneuvering thrusters 46 QQ# 46 Shenzhou VI capsule 46 Martian lander 46 PSLV C9 46 Mars moon Phobos 46 # Apophis 46 Titan IVB 46 Saturnian moon Titan 46 SpaceX Dragon 46 ejectable 46 ion thrusters 46 flyby spacecraft 46 interstellar dust particles 46 exhaust plume 46 Nasa spacecraft 46 irregularly shaped asteroid 46 Comet Churyumov Gerasimenko 46 lunar equator 46 meteoroid 46 cometary dust 46 Martian rover 46 capsule parachutes 46 Martian rocks 46 Gliese #c 46 rover Spirit 46 Doohan ashes 46 protoplanets 46 Thermos bottle 46 Shuttle Discovery blasts 46 Geosynchronous Transfer Orbit GTO 46 origami masters 46 synchronous orbit 46 spacecraft 46 Roddenberrys remains 46 orbital velocity 46 geosynchronous satellite launch 46 parafoil 46 thermos bottle 46 packing crate 46 Michoud La. 46 mu Arae 46 depressurise 46 Lunar Roving Vehicle 46 Martian terrain 46 Japan Kibo laboratory 46 tidal bulge 46 hydrazine fuel 46 GSLV rockets 45 LRO LCROSS 45 electric ion propulsion 45 New Horizons spacecraft 45 BepiColombo 45 Jupiter Icy Moons 45 Canadian Julie Payette 45 Fermi telescope 45 Discovery undocks 45 Comet Halley 45 permanently shadowed crater 45 hypersonic glider 45 spaceward 45 Shuttle undocks 45 Mars rovers Spirit 45 LCROSS spacecraft 45 cryostat 45 Shuttle Discovery docks 45 Zeta Ophiuchi 45 Martian equator 45 Impactor 45 Kounotori 45 depressurised 45 simulated lunar 45 shepherding spacecraft 45 moonlets 45 Sun synchronous orbit 45 gaseous planet 45 Orbiter LRO 45 cometary 45 NASA Gamma ray 45 Jules Verne ATV 45 stratospheric balloon 45 Japanese Kibo laboratory 45 Opportunity Mars rovers 45 hypersonic speeds 45 asteroid 45 outermost planets 45 NASA Cassini orbiter 45 spacecraft Hayabusa 45 Permanent Multipurpose Module PMM 45 WhiteKnight Two 45 airbursts 45 Nasa Mars Odyssey 45 gull wings 45 Ring Nebula 45 Kepler 9c 45 LightSail 1 45 Crewmate Tracy Caldwell 45 rover Sojourner 45 nanosatellite 45 comets meteors 45 allowing superheated gases 45 Charon Pluto 45 Harmony Node 45 Pirs module 45 Manned missions 45 Ariane rocket 45 infrared telescope 45 Opportunity rover 45 Rosetta orbiter 45 MPLM 45 Discovery payload bay 45 Corot 7b 45 closest flyby 45 Philae 45 SpaceLoft XL 45 gravitational keyhole 45 Endeavour Crater 45 Jovian moons 45 propellent 45 cosmonaut Alexander Kaleri 45 Comet Hartley 2 45 transiting exoplanet 45 comet Tempel Tuttle 45 twin fuselages 45 windshield wiper maneuver 45 Flyby spacecraft 45 comet nucleus 44 unstowed 44 breadbox sized 44 Shackleton crater 44 external stowage 44 O OREOS 44 Opportunity rovers 44 Solid Rocket Boosters 44 gimble 44 heaviest payloads 44 unpressurized 44 Sensing Satellite LCROSS 44 geysers erupting 44 Orbital Module 44 PSLV C# rocket 44 Optical Spectroscopic 44 NPO Lavochkin 44 Geminga 44 circumstellar 44 orbited Jupiter 44 Shuttle docks 44 NASA THEMIS 44 jagged ridge 44 SpaceShip Two 44 Atlas 2AS 44 Titan 4B 44 moon Phobos 44 Kuiper belt object 44 Mars Opportunity rover 44 shuttle payload bay 44 unmanned probes 44 Cosmonaut Yuri Gagarin 44 twin Voyager spacecraft 44 VMS Eve 44 Mars Pathfinder 44 orbiter lander 44 ESA Huygens probe 44 Eridanus 44 Kuiper Belt object 44 Moon Impactor Probe 44 ESA Rosetta 44 lander 44 NFIRE satellite 44 Isidis Planitia 44 Kaliurang located 44 MUSES C 44 circular orbit 44 jovian 44 Mars landers 44 saucer shaped 44 Kuiper Belt Object 44 Comet Hartley 44 sun synchronous orbit 44 toxic hydrazine fuel 44 Upsilon Andromedae 44 robot rovers 44 Resembling miniature 44 Huygens 44 THEMIS spacecraft 44 orbital resonance 44 orbiter Cassini 44 Foton spacecraft 44 moonbase 44 ExoMars rover 44 antiproton 44 payload fairing 44 Pegasus XL 44 lunar regolith 44 Opportunity Mars rover 44 Fregat upper stage 44 drogue parachute 44 moondust 44 Rockot launcher 44 Ultraviolet Imaging Spectrograph UVIS 44 Swift Tuttle 44 robotic rovers 44 Itokawa 44 stabilizing gyroscopes 44 cosmonaut Yuri Gagarin 44 orbiting spacecraft 44 Planetary Transits 44 modified Boeing #SP 44 Soyuz spacecraft docked 44 interstellar dust grains 44 superheated gases surrounding 44 toxic hydrazine 44 spacecraft orbited 44 SIM PlanetQuest 44 moons Phobos 44 Pluto Charon 44 Zvezda module 44 Ariane launcher 44 Apollo lunar 44 Soyuz landings 44 projectile 43 Soyuz FG 43 APXS 43 simulated Martian 43 orbital inclination 43 PSLV C8 43 icy moons 43 comet 43 Kliper 43 Saturn outermost moon 43 WhiteKnightTwo carrier 43 SIRTF 43 NEOSSat 43 PSLV C 43 icy comets 43 Perseus Cluster 43 NASA EPOXI mission 43 Oefelein piloted 43 Leonardo Multi Purpose 43 SBSS satellite 43 smallest exoplanet 43 shuttle Endeavor 43 lunar orbiter Chandrayaan 43 orbiter robotic arm 43 starshade 43 spokesman Michael Braukus 43 deorbiting 43 constellation Ursa Major 43 Geeky tweeters 43 engineer Nicole Stott 43 Lunar Reconnaissance Orbiter LRO 43 Mars Odyssey spacecraft 43 Deep Impact craft 43 Foton M3 spacecraft 43 Orbiter MRO 43 lunar landers 43 Scientists theorized 43 redock 43 Jupiter flyby 43 station Zarya module 43 spacecraft SpaceShipTwo 43 Galactic cosmic rays 43 periodic dimming 43 aboard Atlantis 43 basalt volcanic 43 Mir Space Station 43 aeroshell 43 Sojourner Rover 43 vaporise 43 Kosmos 3M 43 atmospheric reentry 43 foam insulation peeled 43 Endurance crater 43 ballistic trajectory 43 lithium hydroxide 43 parachute deploys 43 ducted propeller 43 lunar explorers 43 wheeled rover 43 supercooled liquid 43 Convection Rotation 43 HD #b [001] 43 STSS Demo 43 crater Cabeus 43 LADEE 43 Carina constellation 43 H IIB 43 Helios Prototype 43 gray hematite mineral 43 #cm diameter 43 simulate weightlessness 43 Solar TErrestrial RElations Observatory 43 interplanetary spacecraft 43 engineer Yury Lonchakov 43 station Pirs docking 43 NASA Cassini 43 capsule 43 Atlantis payload bay 43 humanoid robot R2 43 retrograde orbit 43 Cosmodrome 43 smallest exoplanets 43 successfully undocked 43 Soyuz spaceship 43 rover Curiosity 43 Discovery Robonaut 43 asteroid Vesta 43 Insat 3A 43 asteroidal 43 entered lunar orbit 43 lunar meteorites 43 drilling vessel Chikyu 43 spacecraft thrusters 43 P#/P# truss 43 micrometeoroids 43 orbiting Saturn 43 NEAR Shoemaker 43 orbit GEO 43 unpowered landing 43 spaceship 43 shuttlecock shaped capsule 43 ISS robotic arm 43 rover Opportunity 43 winged spacecraft 43 Foton M2 43 steering wheel tilts 43 mere fly bys 43 CryoSat satellite 43 PSLV rocket 43 Huygens lander 43 Stowing 43 floating weightlessly 43 launching Andrian Nikolayev 43 #/#-ton truss 43 unpressurised 42 Libra constellation Vogt 42 Pringles potato chip 42 Dextre robot 42 Kepler spacecraft 42 comet Wild 42 Cabeus crater 42 asteroid Eros 42 Shuttle Endeavor 42 igniting flammable 42 docking compartment 42 HB SIA 42 Mossbauer spectrometer 42 supernova explosion 42 Martian dust devils 42 orbit 42 robotic rover Spirit 42 Shuttle Challenger 42 polar craters 42 Soyuz TMA spacecraft 42 constellation Eridanus 42 aft skirt 42 Glonass K 42 Mars Gusev Crater 42 spacecraft Cassini 42 collector mitt 42 NanoSail D 42 wheeled rovers 42 meteoritic material 42 dustbin lid 42 reconnaissance orbiter 42 Epoxi 42 mothership WhiteKnightTwo 42 Russian cosmonaut Yuri Gagarin 42 heatshield 42 propellant tanks 42 Mars Lander 42 stowed 42 Imagine leaky overladen 42 abyssal plain 42 Express orbiter 42 binary asteroid 42 Cassini spacecraft orbiting 42 GJ#b 42 GA6 42 geo stationary orbit 42 sunlight glinting 42 triangular Mylar sails 42 GeneSat 1 42 Tempel 1 42 Jupiter icy moons 42 exosphere 42 SSMEs 42 Minotaur rocket 42 oxidiser 42 equatorial orbit 42 Xerus 42 manned spacecraft Shenzhou VI 42 Skynet 5C 42 NASA MESSENGER spacecraft 42 Pleiades cluster 42 deorbited 42 undocks 42 #km h [003] 42 NASA rovers Spirit 42 PSLV C# 42 Aboard Atlantis 42 arcsecond 42 Giove B 42 Lt. Col. Yang Liwei 42 Kaguya spacecraft 42 Compton Gamma Ray 42 named Rassvet 42 Saturn Enceladus 42 spherical 42 asteroid belt 42 carry heavier payloads 42 moon Io 42 RQ# 42 asteroid Steins 42 orbiter 42 Accurately determining 42 vaporises 42 comet McNaught 42 X ray spectrometer 42 NASA twin STEREO 42 NASA Deep Impact 42 Orbital Taurus II 42 extrasolar 42 Lockheed Martin Waterton Canyon 42 Hayabusa capsule 42 Russian Dnepr rocket 42 moon landers 42 Oort Cloud 42 Astronauts inspect 42 Chandrayaan II 42 rotates clockwise 42 urine recycler 42 liquid propellants 42 spaceflyers 42 Endeavour undocks 42 spacecrafts 42 robotic geologists 42 Deep Impact 42 axial tilt 42 Discovery undocked 42 NASA Mars rover 42 Soyuz rocket 42 WISE mapped 42 Skycycle 42 OSIRIS REx 42 RY Sagittarii 42 choppiest waters 42 Altair lunar lander 42 Atlantis robotic arm 42 Tunguska Siberia 42 SSETI Express 42 Poisk 42 entire Milstar constellation 42 crawler transporter 42 mooncraft 42 raven trusses defied 42 depressurizes 42 NextSat 42 Lunar Excursion Module 42 Akatsuki spacecraft 42 Chang'eI 42 Atlas Centaur 42 Buzz Lightyear doll 42 dummy payload 42 CAPE CANAVERAL Astronauts 42 Yury Gagarin 42 Deep Impact eXtended Investigation 42 BP Piscium 42 Permanent Multipurpose Module 42 Toutatis 42 EPOXI mission 42 NASA twin rovers 42 meteor fragment 42 ATV Jules Verne 42 Cargo Ship Docks 42 geosynchronous transfer orbit 42 breathing scramjet engine 42 Shenzhou capsule 42 Saturnian 42 orbital insertion 42 geosynchronous 41 MetOp satellite 41 robot Gort 41 NASA Opportunity rover 41 Kuiper Belt Objects 41 cylindrical 41 supercold 41 unexploded munition 41 #ft wingspan [002] 41 tractor beam 41 fiery reentry 41 GOCE satellite 41 geosynchronous Earth 41 rocket boosters 41 mystical realm 41 Planetary nebulae 41 SpaceX Dragon capsule 41 twin rover Spirit 41 weightlessly 41 Space Shuttle Orbiter 41 shuttle orbiter 41 WISE telescope 41 underslung 41 parachutes malfunctioned 41 Titan smoggy 41 Astronaut Leroy Chiao 41 KAGUYA 41 coral encrusted 41 nicknamed Bonneville 41 Opportunity parachuted 41 compressed nitrogen 41 robot Dextre 41 geostationary transfer 41 Hubble Space telescope 41 SELENE probe 41 Cassini Huygens spacecraft 41 colliding protons 41 Chikyu 41 twin rovers Spirit 41 P/# A2 41 spacecraft Chandrayaan 1 41 comets orbiting 41 Shenzhou VI craft 41 Cartosat 2B 41 multistage Taepodong 41 supersonic combustion 41 Shuttle Discovery lands 41 weather satellite TIROS 41 juvenile tuatara 41 SpaceShipTwo SS2 41 Russian Valeri Polyakov 41 Cygnus spacecraft 41 Valles Marineris canyon 41 spinning turbine blades 41 protruding strips 41 Geosynchronous Transfer Orbit 41 #ft wingspan [001] 41 #mph [003] 41 thruster firings 41 thruster 41 gimbaled 41 robotic geologist 41 orbital altitude 41 multiton 41 Voyager spacecraft 41 ship Monchegorsk 41 outer space 41 preset orbit 41 lunar craters 41 NASA rover Opportunity 41 penumbral shadow 41 shuttle Discovery blasted 41 nitrogen tetroxide 41 comet Hale Bopp 41 landing superheated gases 41 canister 41 Impact Probe MIP 41 propellant loading 41 ROCSAT 2 41 GSLV Mk III 41 INSAT satellite 41 manned lunar 41 orbiting Hubble telescope 41 rovers 41 Papier mâché 41 gliding silently 41 Pirs Docking Compartment 41 NASA ICESat 41 VSS Enterprise 41 buckypaper virtually 41 X ray observatory 41 Yuri Shargin 41 constellation Hercules 41 Solar Terrestrial Relations 41 waterfalls fountains 41 asteroids comets 41 hydrazine toxic 41 martian rocks 41 Shuttle Atlantis undocks 41 Comet Lulin 41 cagelike 41 comet tail 41 Dnepr rocket 41 blue cloud specked 41 geosynchronous orbit 41 PSLV C7 41 shuttle Atlantis astronauts 41 Plesetsk Cosmodrome 41 amateur skywatchers 41 docking adapter 41 moons orbiting Pluto 41 #ft 5m 41 Orbiter Processing Facility OPF 41 albedo reflectivity 41 subatomic particle 41 Earth radii 41 ESA Automated Transfer 41 Hayabusa 41 filamentary structures 41 Gemini constellation 41 lazarette 41 planet Gliese #g 41 SMOS mission 41 Tunguska meteorite 41 Magnetars 41 inky depths 41 orbiting observatories 41 Orbital Express 41 highly elliptical orbits 41 Space Telescope GLAST 41 piggybacked Huygens probe 41 commander Dmitry Kondratyev 41 robotic submersible 41 orbiter payload bay 41 neutron spectrometer 41 Hubbles 41 Pirs docking compartment 41 THEMIS probes 41 stage Naro rocket 41 Comet Machholz 41 LZ# [002] 41 ST5 41 Discovery undocking 41 asteroids Ceres 41 JIMO 41 ENAs 41 Titan flyby 41 sunlike star 41 ionised gas 41 Heliospheric Observatory SOHO 41 Ulysses spacecraft 41 Stardust spacecraft swooped 41 Geo synchronous 41 maritime subsurface 41 constellation Taurus 41 Asteroid Itokawa 41 payload bay doors 41 cosmic cannibal 41 robotic landers 41 robotic rover 41 orbiter Atlantis 41 Martian craters 41 lunar orbit 41 mason jar containing 41 orbiting Cassini spacecraft 41 Atlantis Undocks From 41 Spacesuits 40 Viking Orbiter 40 Viking landers 40 BepiColombo joint 40 gimbals 40 Shenzhou V 40 Mars rover Opportunity 40 coronal loops 40 HTV2 40 twin STEREO spacecraft 40 circumlunar 40 Ocean Salinity SMOS 40 Launch Scrubbed 40 payload 40 bolide 40 highly elliptical orbit 40 laboratory Skylab 40 stony meteorite 40 Mercury Redstone 40 Oort cloud 40 X #A scramjet 40 Automated Transfer Vehicles 40 SpaceShipTwo spacecraft 40 heatproof 40 Deep Impact mission 40 Cometary 40 SPHERES 40 Russian crewmate Yuri 40 NASA rovers 40 intergalactic spaceship 40 celestial object 40 Zenit 3SL 40 businesswoman Anousheh Ansari 40 INSAT 4CR 40 Thoroughly inspect 40 Soyuz Fregat rocket 40 Mikhail Tyurin 40 Kibo module 40 Kitten survives 40 Gravitational waves 40 NASA LCROSS 40 SpaceLoft 40 Cassini Huygens 40 Kazakhstan Baikonur Cosmodrome 40 aft compartment 40 STEREO spacecraft 40 lunar crater 40 moons orbiting 40 SpaceshipTwo 40 Jiaolong 40 exo planet 40 scramjet engine 40 orbital solitude 40 CoRoT #b 40 Apophis asteroid 40 Astronaut Sunita Williams 40 tow dollies 40 six wheeled rover 40 Shenzhou VII spacecraft 40 THEMIS satellites 40 SMOS Soil Moisture 40 SpaceShipOne rocket 40 aboard Skylab 40 El Teide 40 Elenin 40 Ranging spacecraft 40 Shuttle Atlantis blasts 40 magnetic coil 40 unpressurized cargo 40 millimeter mortar 40 Helios 2A 40 Galilean moons 40 YU# 40 simulated weightlessness 40 geo synchronous orbit 40 Special Purpose Dexterous Manipulator 40 Mandushev 40 interplanetary missions 40 LCROSS Centaur upper 40 gaseous hydrogen 40 propeller shafts 40 Lake Cheko 40 Silver Dart 40 unbaked clay 40 stationary lander 40 Zenit 3SL rocket 40 RL# engine 40 orbits Saturn 40 LISA Pathfinder 40 ionized gas 40 Arabsat 5A 40 smallest extrasolar planet 40 rover 40 GOCE 40 scramjets 40 stalactites hanging 40 probe Huygens 40 orbiting telescope 40 terraformed 40 ion thruster 40 Launch Abort System 40 SBSS Block 40 NuSTAR 40 Martian dust 40 ejecta plume 40 Viking Lander 40 Benthic Rover 40 Taepondong 2 40 Herschel Space Telescope 40 HiRISE image 40 spacemen Timothy Kopra 40 shuttle Discovery STS 40 Shuttle Endeavour blasts 40 cryogenic liquid 40 meteoroid impacts 40 commander Pam Melroy 40 Noachian era 40 thin crescent 40 #/#-hour descent 40 Rassvet 40 Environment Explorer LADEE 40 Grammier 40 spacecraft disintegrated 40 makeshift hacksaw 40 ESA ASI 40 ballistic parachute 40 suborbital trajectory 40 Tevatron collider 40 microscopic imager 40 manned spaceships 40 basalt rocks 40 neatly stowed 40 asteroid flyby 40 exploded harmlessly 40 colliders 40 Mars Spirit rover 40 Tempel Tuttle 40 Dragon capsule 40 foam fragment 40 cosmic particles 40 Jovian moon 40 pressurized compartments where 40 Steins asteroid 40 aft bulkhead 40 Infrared Astronomy SOFIA 40 NASA Kepler spacecraft 40 hydrazine thrusters 40 NFIRE 40 KSLV 1 40 icy moon Enceladus 40 PharmaSat 40 beachball sized 40 Russian Nikolai Budarin 40 proton particles 40 flightworthy 40 Baikonur Kazakhstan 40 OGLE TR #b 40 Orion spacecraft 40 Earth gravitational pull 40 GSAT 5P 40 quadrocopter 40 Satellite Launch Vehicle GSLV 40 exoplanets orbiting 40 Kounotori vehicle 40 microquasar 40 yacht Granma 40 Valentina Tereshkova 40 conventional warhead 40 SpaceWeather.com 40 onsen hot 40 Satish Dhawan Space 40 trailer hitched 40 unmanned submersibles 40 SpaceShip 40 inflatable tubes 40 midships 40 Spitzer infrared telescope 40 Rosetta spacecraft 40 Pirs airlock 40 starboard truss 40 planets comets 40 XP# [004] 40 Horizons spacecraft 40 parabola shaped 40 relativistic jets 40 X #A Waverider 40 Aqua satellite 40 superhot gases 40 Halley comet 40 HD#b 40 scramjet engines 40 Saturn moons 40 electromagnet 40 storage igloos 40 carbonfiber 40 Russian cosmonaut Alexander Kaleri 40 cosmonaut Pavel Popovich 40 orbital maneuvering 40 uncrewed 40 Martian moons Phobos 40 synchronous polar 40 CHIPSat 40 cylindrical shaped 40 ionizes 39 lunar orbits 39 Comet Boethin 39 twin hulled 39 planet magnetosphere 39 GSLV D3 rocket 39 interstellar cloud 39 exoatmospheric kill vehicle 39 NASA rover Spirit