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(Click for frequent words.) 48 Jean Francois Clervoy 47 Carolyn Wincer 46 Boris Morukov 44 duration spaceflight 42 Biological Problems 41 Allard Beutel NASA 41 zero gravity 40 cosmonauts 40 astronautical 40 Qi Faren 39 Biomedical Problems 39 Alexei Krasnov 39 Pang Zhihao researcher 39 commander Leroy Chiao 39 Muszaphar 39 Shenzhou VII 38 ISS crewmembers 38 Shenzhou VI 38 Bill Readdy NASA 37 Yang Liwei 37 weightlessness 37 Norman Thagard 37 Simonetta Di Pipo 37 airsickness 37 taikonauts 37 Konstantin Feoktistov 37 Novespace 37 spacefarers 37 Milt Heflin 37 NASA Microgravity 37 sub orbital spaceflight 36 Psychological profiling 36 Shenzhou V 36 Courtenay McMillan 36 duration spaceflights 36 pressurized spacesuits 36 outer space 36 Mamoru Mohri 36 extravehicular 36 simulate weightlessness 36 taikonaut 36 Gorbunov 36 Cosmonaut Training Center 36 Jing Haipeng 36 Shenzhou VII spacecraft 36 Holly Ridings 36 Satcher Jr. 36 pressurized cabins 35 Taikonauts 35 epinephrine pen 35 floating weightlessly 35 angkasawan 35 Microgravity 35 cosmonaut 35 Chiaki Mukai 35 astronauts Fei Junlong 35 Ngo Anh 35 Claude Nicollier 35 Nie Haisheng 35 Firouz Naderi 35 International Space Station 35 Budarin 35 Zhang Zhi 35 astronaut Zhai Zhigang 35 rescue capsule rotates 35 Oliver Knickel 34 Astronaut Leroy Chiao 34 Russell Schweickart 34 Tom Marshburn 34 Taikonaut 34 astronauts Zhai Zhigang 34 Lieutenant Colonel Yang Liwei 34 Mars# experiment 34 Shenzhou spacecraft 34 middeck 34 Rosaviakosmos 34 Fei Junlong 34 Skylab Mission 34 spokesman Igor Panarin 34 spacesuit 34 Orbital Outfitters 34 spacewoman 34 Zhai Zhigang 34 Vitaly Davydov deputy 34 Kloeris 34 instrument calibrations 34 Krikalyov 34 shuttle middeck 34 cosmic radiation 34 IMBP 34 motion sickness 34 extravehicular activities 34 Norm Thagard 34 Clervoy 34 Bob Curbeam 34 spacecraft SpaceShipTwo 33 Astronaut 33 Daniel Sacotte ESA 33 astronaut Leroy Chiao 33 Stodieck 33 engineer Sandra Magnus 33 Mars# 33 CDR SO 33 Space Station 33 simulated weightlessness 33 Sacred Vessel 33 spacesuit gloves 33 microgravity 33 SpaceX Dragon 33 simulated microgravity 33 Lunar Outpost 33 Zhai Zhigang Liu Boming 33 Soviet cosmonauts 33 ARCTUS 33 Belakovsky 33 Nasa astronaut 33 astronaut Peggy Whitson 33 Soyuz TMA spacecraft 33 iStan 33 Russian Salizhan Sharipov 33 Ginger Kerrick 33 SpaceShipTwo SS2 33 airlock module 33 astronaut 33 Shenzhou V spacecraft 33 aquanaut 32 astronaut Charles Camarda 32 nanorobots 32 perform microsurgery 32 Terry Virts 32 Chang'eI 32 crewed spacecraft 32 Astronaut Sunita Williams 32 Akihiko Hoshide 32 spaceflight 32 cosmonaut training 32 astronauts Jing Haipeng 32 Nasa 32 Lopota 32 Shenzhou VI spacecraft 32 Randy Bresnik 32 Lt. Col. Yang Liwei 32 moonbase 32 Alexander Smoleyevsky 32 astronauts 32 Suborbital 32 Svetlana Savitskaya 32 Garret Reisman 32 Tim Kopra 32 Sergei Gorbunov spokesman 32 Takao Doi 32 Ken Bowersox 32 interplanetary 32 hypobaric chamber 32 spacemen 32 Liu Boming 32 decompression chamber 31 Daisuke Enomoto 31 spaceship 31 William Readdy 31 Nikolai Budarin 31 Yury Lonchakov 31 Mikhail Tyurin 31 engineer Oleg Kononenko 31 Karen Nyberg 31 Roskosmos 31 orbited Earth 31 Nasa Ames 31 EVA extravehicular activity 31 Plane OSP 31 Foton M3 31 Gedmark 31 Dan Durda 31 Charles Hobaugh 31 backaches headaches 31 postflight 31 thruster firings 31 Mission SPACE 31 spaceflyer 31 microgravity environment 31 uncrewed 31 dubbed taikonauts 31 manned spaceship 31 Alexei Leonov 31 Alexander Samokutyayev 31 computerized mannequins 31 extraocular muscles 31 Feitian 31 Charles Camarda 31 circumlunar 31 SSETI Express 31 Vinogradov 31 extravehicular activity 31 Foton M2 31 Yuri Malenchenko 31 NASA Stratospheric Observatory 31 spacesuits 30 William Readdy NASA 30 RKK Energia 30 Russian cosmonaut Salizhan Sharipov 30 Spacesuits 30 Spacewalker 30 Shenzhou 30 Russian cosmonauts Sergei Volkov 30 Valentina Tereshkova 30 engineer Salizhan Sharipov 30 CNSA 30 Spacewalking 30 Metin Sitti 30 outerspace 30 Bjarni Tryggvason 30 NASA Astronaut 30 muscle atrophy 30 Dominic Gorie 30 Suni Williams 30 Story Musgrave 30 Cargo Ship Docks 30 engineer Yury Lonchakov 30 intergalactic spaceship 30 Yury Gagarin 30 Infrared Astronomy SOFIA 30 Bowersox Pettit 30 Nasa Mars Reconnaissance 30 Apollo Skylab 30 Vomit Comet 30 Neutral Buoyancy Lab 30 NASA 30 Salizhan Sharipov 30 Tyurin 30 astronaut Julie Payette 30 ballistic descent 30 NPO Lavochkin 30 decompression sickness 30 Berinstain 30 spacecraft 30 hypersonic missiles 30 manned spaceships 30 spacecrafts 30 spaceflights 30 Kirk Shireman 30 Samokutyaev 30 unpressurised 30 Humanoid robot 29 Zero Gravity Corp. 29 JAXA 29 cosmonaut Fyodor Yurchikhin 29 Bill Gerstenmaier associate 29 agency Rosaviakosmos 29 Charles Elachi 29 engineer Valery Tokarev 29 pressurized rovers 29 Shenzhou IV 29 Russian cosmonaut 29 Soyuz landings 29 spaceward 29 Col. Yang Liwei 29 acrophobia 29 journal Acta Astronautica 29 microgravity experiments 29 manned spacecraft Shenzhou VI 29 pressurized compartments 29 orbital 29 Naoko Yamazaki 29 Sergei Volkov 29 Manyapu 29 orbiting laboratory 29 hypersonic scramjet 29 So yeon Yi 29 carry heavier payloads 29 planetary geology 29 Lopez Alegria 29 GeneSat 29 OMS pods 29 Zero Gravity 29 Perchonok 29 badminton shuttlecock 29 Sibeck 29 Russian cosmonaut Yuri Gagarin 29 Space 29 terra forming 29 Xie Mingbao 29 Romanenko 29 micrometeorite 29 Yinghuo 1 29 redock 29 Col. Ilan Ramon 29 Malenchenko 29 Kavandi 28 Heidemarie M. 28 DragonLab 28 cosmonaut Valery Tokarev 28 Pilot George Zamka 28 suborbital 28 Mike Sarafin radioed 28 hypersonic speeds 28 dexterous robots 28 astronauts Peggy Whitson 28 robotic 28 manager Kirk Shireman 28 Leroy Chiao 28 manned Shenzhou 28 commander Pam Melroy 28 Human Spaceflight Microgravity 28 Kliper 28 Charlie Camarda 28 Orbiters 28 MPLM 28 Russian cosmonauts 28 probe Huygens 28 Cosmonaut Yuri Gagarin 28 ISS 28 Bob Behnken 28 nanobot 28 shuttle Endeavor 28 Spacewalks 28 Japanese astronaut Naoko 28 cosmonaut Salizhan Sharipov 28 spacewalking 28 Astronauts 28 Dottie Metcalf Lindenburger 28 hypersonic propulsion 28 robotic explorer 28 NASA astronaut 28 Robert Satcher 28 suborbital spaceflight 28 hypervelocity 28 William Gerstenmaier NASA 28 Rusty Schweickart 28 harrowing claustrophobic 28 Kirk Shireman NASA 28 Space Shuttle Orbiter 28 Russian Orlan 28 muscle twitches 28 Deke Slayton 28 surnamed Xiang 28 vomit comet 28 microbots 28 shuttle Atlantis astronauts 28 spaceships 28 Canadarms 28 System OBSS 28 Space Shuttle Endeavor 28 Pam Melroy 28 Lunar Exploration 28 commander Sergei Volkov 28 Spacecraft 28 Weightless Wonder 28 Canadian Julie Payette 27 ear barotrauma 27 orbital module 27 Razali Daud 27 space 27 Divine Vessel 27 Sandra Magnus 27 spaceflyers 27 Shannon Lucid 27 unstowed 27 dexterous robot 27 Mir Space Station 27 Kaleri 27 shuttle Atlantis 27 spokesman Valery Lyndin 27 orbital altitude 27 Anousheh 27 colonize Mars 27 enters lunar orbit 27 Weightless 27 Joel Sitz project 27 Frenchman Leopold Eyharts 27 Space Agency 27 Richard Branson Virgin Galactic 27 commander Peggy Whitson 27 spokesperson Allard Beutel 27 Pamela Melroy 27 Padalka 27 Soyuz capsules 27 UTTR 27 Sabir Ilyasov 27 spacefaring 27 Ron Garan 27 exhaust plume 27 Byron Lichtenberg 27 SpaceShip One 27 Virgin Galactic unveils 27 ISS robotic arm 27 Leland Melvin 27 orbit 27 interplanetary spacecraft 27 Gennady Padalka 27 engineer Timothy Kopra 27 floating weightless 27 Dr. Mae Jemison 27 Astronaut Timothy Kopra 27 O OREOS 27 Spirit Mars rover 27 Manned Maneuvering Unit 27 lunar landers 27 Stephanie Stilson NASA 27 Virgin Galactic spaceship 27 Jon Karkow 27 telemetry instrumentation 27 ocean splashdowns 27 Guenter Wendt 27 manned spacecraft 27 Peter H. Diamandis 27 Esrange 27 Rick Searfoss 27 Cathy Koerner 27 weightless 27 Japan Kibo laboratory 27 Nicollier 27 spaceflight participant 27 Shuttle Endeavor 27 NASAs 27 spokesman Paul Foerman 27 Martian rovers 26 Michael Zolensky 26 ESA astronaut 26 earthbound 26 Cosmonaut Hotel 26 Eurobot 26 tardigrades 26 spaceliner 26 Peggy Whitson 26 interplanetary voyage 26 ice cream tubby 26 humanoid robots 26 geo synchronous 26 weightless Hawking 26 Jeff Greason 26 Kibo robotic arm 26 astronaut Owen Garriott 26 jet propulsion 26 Yuri Shargin 26 Roberto Vittori 26 Astrogenetix 26 hypersonic 26 shuttle orbiter 26 Koichi Wakata 26 urine recycler 26 Observatory SDO 26 planetary surfaces 26 Kibo JPM JEM Pressurized 26 aboard Soyuz rocket 26 spatial disorientation 26 sub orbital 26 aboard Atlantis 26 fiery reentry 26 lifting barbell 26 NASA THEMIS 26 suborbital spacecraft 26 SpaceShip 26 Kibo module 26 Weightlessness 26 simulated Martian 26 Claramunt 26 Rick Linnehan 26 Krikalev 26 Diego Urbina 26 Virgin Galactic SpaceShipTwo 26 Curiosity rover 26 capsule rotates 26 Pedro Duque 26 shuttle 26 Baikonur Kazakhstan 26 David Southwood ESA 26 astronaut Andrew Feustel 26 director Annette Hasbrook 26 robot 26 orbiting 26 stratospheric balloon 26 Vostok spacecraft 26 ferry SpaceShipTwo 26 Alexey Sitev 25 orbital spaceflight 25 director Tony Ceccacci 25 Lyndin 25 Phobos Grunt 25 pressurized compartments where 25 Piers Sellers 25 People Daily www.people.com.cn 25 popcorning 25 Orbital Module 25 veteran spacewalker 25 Hsu Chih 25 #/#-hour spacewalk [001] 25 Jianyong 25 Bill Gerstenmaier NASA 25 Virgin Galactic suborbital 25 ENose 25 engineer Yuri Lonchakov 25 SpaceShipTwo spacecraft 25 astronaut Timothy Kopra 25 Foale 25 Soyuz 25 unpiloted 25 jetpacks 25 Commander Leroy Chiao 25 teleportation 25 Northrop Grumman Weightless Flights 25 Greg Chamitoff 25 surnamed Ren 25 antigravity 25 deorbiting 25 suborbital space 25 ISS Expedition 25 alien abductees 25 director Holly Ridings 25 Helen Sharman 25 Russian crewmate Yuri 25 comet chaser 25 Hu Jiashi deputy 25 Pirs module 25 BioSuit 25 Dan Tani 25 glandular secretions 25 Astrolab 25 Atlantis undocks 25 Dream Chaser 25 shuttle liftoffs 25 Bob Thirsk 25 Cady Coleman 25 HIAPER 25 seven windowed cupola 25 space shuttle 25 shuttle Discovery 25 Spaceships 25 ZERO G 25 Gossamer Penguin flew 25 Kazakhstan steppes 25 astronaut Rex Walheim 25 Soyuz capsule 25 Russian leased Baikonur 25 Manned Space 25 aboard Skylab 25 MedicAlert bracelets 25 oxygen deprivation 25 Paulo Nespoli 25 Nicole Stott 25 manager Mike Suffredini 25 maneuvering thrusters 25 gravities 25 Commander Rick Sturckow 25 pilot Terry Virts 25 Maxim Surayev 25 Winglee 25 spacecraft Chandrayaan 1 25 STSS Demo 25 Cosmonaut Valery Tokarev 25 commander Zhai Zhigang 25 orbiter 25 unpowered glide 25 NASA Mars rover 25 meteoroid 24 Altair lunar lander 24 station Canadarm2 robotic 24 pilot Charles Hobaugh 24 Jakosky 24 SpaceX Dragon capsule 24 interstellar 24 autonomous rendezvous 24 Soyuz craft 24 Kenneth Bowersox 24 Charles Simonyi 24 Soyuz rockets 24 space shuttle Endeavour 24 Exoskeleton 24 suborbital flight 24 Soyuz spacecraft 24 simulates weightlessness 24 Donald Deke Slayton 24 lunar landings 24 Space Capsule 24 Mars landers 24 Linear Acceleration 24 nanosatellite 24 NM spaceport 24 IBEX spacecraft 24 Manned Spacecraft Center 24 George Zamka 24 Russian cosmonauts Gennady Padalka 24 Mel Feit 24 atmospheric reentry 24 orbiting complex 24 Barry Butch Wilmore 24 astral projection 24 Honda Asimo 24 supersonically 24 Shenzhou VI craft 24 Hawking 24 engineer Nicole Stott 24 Martian terrain 24 robotic rovers 24 orgone energy 24 engineer Yuri Malenchenko 24 simulated 24 Commander Pam Melroy 24 docking compartment 24 Space Shuttle 24 Astronaut Danny Olivas 24 station Quest airlock 24 Cosmonaut Yuri Shargin 24 extravehicular activity EVA 24 coughing sneezing laughing 24 Xueyan 24 gloved congratulatory handshake 24 Darcy Hennemann 24 eliptical 24 Virgin Galactic 24 Roman Romanenko 24 Shuttle Discovery docks 24 Russian crewmate Salizhan 24 Wakata 24 Russian cosmonaut Yuri Usachev 24 Alfred McEwen 24 aboard Soyuz TMA 24 Flight Engineer Suni 24 spaceman 24 Vassilis Angelopoulos 24 Giove B 24 constricted isolating conditions 24 Skylab 24 Earth orbit 24 starboard truss 24 Quest airlock 24 NeuroArm 24 ballistic trajectory 24 Extra Vehicular Activity 24 Russians Fyodor Yurchikhin 24 Ng Tze 24 Joe Acaba 24 Soyuz rocket 24 Peter Diamandis 24 robot locomotion 24 De Winne 24 Oleg Kononenko 24 Gagarin flight 24 Don Sweetnam 24 agency Roscosmos 24 Edwin Aldrin 24 André Borschberg 24 Saturn Cassini 24 Nasa Jet Propulsion 24 Mars rovers Opportunity 24 winged spacecraft 23 orbital outpost 23 Commander Alexander Skvortsov 23 Nowak donned wig 23 Mike Suffredini 23 commander Dmitry Kondratyev 23 Mission Control 23 Space Shuttle Discovery 23 astronaut Greg Chamitoff 23 Harry Potter invisibility cloak 23 heavier payloads 23 Na Nakorn 23 André Kuipers 23 spacewalking astronauts 23 Daniel Tani 23 unpressurized 23 Shane Kimbrough 23 Skripochka 23 physiological reactions 23 NASTAR Center 23 ISS crewmember 23 tourist Charles Simonyi 23 Tranquility module 23 bipedal locomotion 23 Walter Schirra 23 weightlessly 23 Shuttle Launch Experience 23 spacewalker 23 chest pains fainting 23 reusable spacecraft 23 station airlock 23 director Charles Elachi 23 Russian Soyuz spacecraft 23 Sumang 23 Gilbert Enoka 23 EPOCh 23 Ares IY 23 pressurized cabin 23 moonwalkers 23 unmanned Progress 23 orbital mechanics 23 ESA Integral 23 robotic Canadarm 23 extravehicular mobility units 23 Frank De Winne 23 Endeavour astronaut 23 Shuttle undocks 23 ballistic parachute 23 Shidlovsky 23 suborbital flights 23 astronauts Nicole Stott 23 prelaunch preparations 23 lunar lander 23 aboard Soyuz spacecraft 23 PSLV C6 23 Fincke radioed 23 astral 23 Zero Gravity Corporation 23 Chandrayaan II 23 planetary atmospheres 23 deorbit 23 space shuttle Discovery 23 suborbital rockets 23 Commander Charlie Hobaugh 23 Discovery undocks 23 Spacesuit 23 Discovery undocked 23 Susan Kilrain 23 Shuttle astronaut 23 Dryden Aircraft 23 Foton spacecraft 23 shuttle Endeavour STS 23 tourist Richard Garriott 23 Spacewalkers Scott Parazynski 23 Apollo lunar 23 Epley maneuver 23 specialists Lisa Nowak 23 Karel Svoboda 22 tiny meteoroids 22 Shuttle Docks 22 cosmonaut Yuri Malenchenko 22 NASA Weightless Wonder 22 Samokutyayev 22 Yurchikhin 22 LRO LCROSS 22 Atlantis Undocks From 22 Stardust NExT mission 22 Space Shuttle Endeavour 22 Alexander Kaleri 22 hypersonic jet 22 Shuttle Atlantis docks 22 astronaut Scott Parazynski 22 Shuttle Discovery 22 Manned missions 22 Rocketplane XP 22 suborbital spaceflights 22 SpaceShip Two 22 Yury Malenchenko 22 Kounotori2 22 Mars Lander 22 Commander Sergei Volkov 22 Shuttle Landing 22 Scaled Composites 22 Cosmonauts Sergei Volkov 22 Russian Mikhail Tyurin 22 Huygens mission 22 MirCorp 22 origami masters 22 Fincke 22 Interplanetary Internet 22 carnivorous beasts 22 L. Behnken 22 Bigelow Aerospace 22 simulator 22 orbital insertion 22 undocks 22 Japan Koichi Wakata 22 Orion capsule 22 Russian cosmonaut Alexander Kaleri 22 ExoMars rover 22 Orbital Express 22 disorientation 22 orbit GEO 22 shuttle Discovery STS 22 Shuttle astronauts 22 FASTSAT 22 spacewalk 22 Zhou Hongyu 22 veteran spaceflyer 22 Judy Resnik 22 NEEMO 22 planetary Transits 22 Robert Behnken 22 LISA Pathfinder 22 Mars Color Imager 22 Huygens Probe 22 Cape Canaveral Fla. 22 Virgin Galactic WhiteKnightTwo 22 orbital maneuvering 22 capsule 22 Agency JAXA 22 commander George Zamka 22 airlock 22 Zvezda Service 22 Mars #/#-gravity 22 SAINT BRIEUC France 22 Kononenko 22 Russian Soyuz rocket 22 simulate 22 Zero Gravity Flight 22 Xerus 22 Wallops Island Va. 22 Shuttle Discovery astronauts 22 Anousheh Ansari 22 Solid Liquid Mixtures 21 Lunar Rover 21 SuitSat 21 Mars rover 21 Hayabusa probe 21 Gregory Chamitoff 21 Cheng Hai 21 Endeavour docked 21 protruding filler 21 Discovery STS 21 Peter Diamandis chairman 21 Advanced Diagnostic Ultrasound 21 Cosmodrome 21 Hubble orbits 21 hypersonic flight 21 spacewalks 21 ESA GOCE 21 Guy Laliberte 21 Andrey Borisenko 21 Ehrsson 21 LOCAD PTS 21 silica tiles 21 Mars Rover 21 orbiting Hubble telescope 21 suborbital spaceship 21 Japanese Kibo laboratory 21 airspeeds 21 Robonaut 21 Elliptical machines 21 Aircruise 21 Lunar Roving Vehicle 21 certificate attesting 21 Atlantis 21 Carole Florman 21 manned orbital 21 deorbit burn 21 sensory immersion 21 fellow spacewalker 21 astronaut Piers Sellers 21 cruising altitudes 21 spokesman Michael Braukus 21 Heidemarie Stefanyshyn Piper 21 fragile thermal tiles 21 Solar Dynamics Observatory 21 Solar TErrestrial RElations Observatory 21 interplanetary missions 21 cryogenic propellants 21 microrobot 21 Rebecca Gomperts 21 ion propulsion 21 spaceplane 21 claustrophic 21 Primum non nocere 21 liftoff 21 cosmonaut Yuri Gagarin 21 GeneSat 1 21 F. Readdy NASA 21 Orbiter 21 Earth ionosphere 21 Mike Melvill 21 ultraprecise 21 parabolic arcs 21 Lee Archambault 21 Masten Space Systems 21 lunar rover 21 Shuttle Discovery blasts 21 float weightlessly 21 Skvortsov 21 orbiting lab 21 shuttle orbiters 21 EPOXI mission 21 SpaceshipTwo 21 scramjet 21 G FORCE ONE 21 UA Lunar 21 Saturnian moon Titan 21 Russian Soyuz 21 Soviet cosmonaut Yuri Gagarin 21 generic bactrim 21 robotic rover Spirit 21 Red Planet 21 airship 21 comets meteors 21 comet flyby 21 Mars 21 orbital inclination 21 Ares IX rocket 21 Shuttle Challenger 21 astronauts undocked 21 director Derek Hassmann 21 Stratospheric Observatory 21 commander Gennady Padalka 21 CALIPSO 21 Endeavour STS 20 VASIMR 20 Moonbase Alpha 20 protruding strips 20 suborbital trajectory 20 unmanned probes 20 Commander Fyodor Yurchikhin 20 Shuttle Endeavour undocks 20 GLAST spacecraft 20 tourist Guy Laliberte 20 Mars CRISM 20 robotic rover 20 Mike Fincke 20 Ilham Amirov 20 Astronauts aboard 20 Ivan Melnikov 20 Yubin 20 manned lunar landing 20 Russian cosmonaut Valery Tokarev 20 Highly Adaptable Satellite 20 ESA Cluster 20 unpressurized cargo 20 Wingsuit 20 Opportunity rovers 20 Exploration Vehicle 20 Robotic Arm 20 tile filler 20 WhiteKnight Two 20 Gene Cernan 20 pressurized module 20 engineer Garrett Reisman 20 physicist Max Planck 20 reboost 20 Jerrie Cobb 20 Eyharts 20 Branson Virgin Galactic 20 YES2 20 Huygens descent 20 Mojave Spaceport 20 Captain Khlebnikov 20 Japanese Kibo module 20 flagyl cheap 20 ducted propeller 20 traumatologist 20 Gennady Shvets 20 shuttle Discovery astronauts 20 Shuttle docks 20 Hoshide 20 Stefanyshyn Piper 20 Pavel Vinogradov 20 Red Bull Stratos 20 Russian cosmonauts Andrei Borisenko 20 Asteroid Itokawa 20 Borschberg 20 jetpack 20 gravitational acceleration 20 Deborah Popowski 20 Lunar Module Pilot 20 Mario Montejo 20 electric ion propulsion 20 Bart Weetjens 20 Soviet cosmonaut Valentina Tereshkova 20 whirling centrifuge 20 Grammier 20 donned bulbous red 20 tickling sensation 20 orbital laboratory 20 depressurizing 20 Eileen Collins 20 albedo reflectivity 20 IASI 20 Japanese astronaut Takao 20 kilopascals 20 THEMIS satellites 20 UP Aerospace 20 Haise 20 Deep Impact flyby spacecraft 20 shuttle payload bay 20 Melvill 20 lunar surface 20 physiological responses 20 Richard Garriott 20 Vunjak Novakovic 20 involuntary muscle spasms 20 GOCE 20 commercial spaceline 20 lunar module 20 VASIMR engine 20 Paramagnetic Aggregates 19 Educator Astronauts 19 Shepherding Spacecraft 19 Martian orbit 19 Commander Sergei Krikalev 19 Laboratory Freezer 19 Marijana Kovacevic 19 Earth magnetosphere 19 shuttle Discovery undocked 19 Space Elevator 19 Itokawa asteroid 19 specialists Scott Parazynski 19 Timur Batyrshin 19 blastoff 19 Frick radioed 19 tethered balloon 19 X #A Waverider 19 Andrei Borisenko 19 Shallow Subsurface Radar 19 VSS Enterprise