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(Click for frequent words.) 62 planetary missions 58 human spaceflight 58 NASAs 56 lunar exploration 56 Mars Pathfinder 55 celestial observations 55 planetary science 55 heliophysics 55 astrobiological 55 planetary explorations 55 NASA THEMIS 55 Manned missions 54 interplanetary missions 54 Sponnick 54 manned lunar landing 54 lunar landings 54 Jupiter Icy Moons Orbiter 54 orbiters landers 53 NuSTAR 53 robotic explorers 53 Jupiter Icy Moons 53 dexterous robot 53 exobiology 53 Astrobotic 53 BepiColombo 53 crewed spacecraft 52 Cosmic Vision 52 Cassini Equinox 52 robotic rovers 52 ExoMars 52 manned lunar missions 52 astrophysics 52 SCISAT 52 unmanned probes 51 Hubble Servicing 51 Heliophysics 51 Decadal Survey 51 EPOCh 51 astrobiology 51 manned spaceflight 51 Solar Orbiter 51 Huygens mission 51 ExoMars mission 50 Lunar Prospector 50 orbiting observatories 50 OSIRIS REx 50 orbital rendezvous 50 ferrying astronauts 50 lunar missions 50 infrared astronomy 50 manned orbital 50 ICESCAPE 50 Kepler Space Telescope 50 unmanned lunar 50 lunar expeditions 50 Europa Orbiter 50 lunar landers 50 Luan Enjie 50 astronomy 50 NLSI 50 Astro E2 50 Hubble servicing 50 LADEE 50 Apollo missions 50 spaceflight 49 manned lunar 49 David Southwood ESA 49 Lunar Reconnaissance Orbiter LRO 49 Jet Propulsion Laboratory 49 Simonetta Di Pipo 49 Richard Gilbrech 49 Director Charles Elachi 49 Orbital Express 49 lunar landing 49 manned missions 49 ExoMars rover 49 NASA MESSENGER 49 Chandrayaan II 49 NASA 49 Saturnian moon Titan 49 Phobos Grunt 49 interplanetary spacecraft 49 Pluto Charon 49 spacecraft 49 extravehicular activities 49 JPL manages 49 BepiColombo joint 49 Solar TErrestrial RElations Observatory 49 Mars Surveyor 49 exoplanet hunter 49 observational astronomy 49 NASA Cosmic Background 49 Innovative Partnerships Program 49 Interior Laboratory GRAIL 49 NASA Jet Propulsion Laboratory 49 Daniel Sacotte 49 JTAC declared 49 Laurie Leshin 48 Human Spaceflight 48 planetary Transits 48 MARSIS radar 48 Terrestrial Planet Finder TPF 48 remote sensing 48 moon Europa 48 Lunar Exploration 48 Kepler Mission 48 planetary scientist 48 Jean Luc Margot 48 NAVSTAR Global Positioning System 48 Spaceguard 48 IPY 48 Calibrant 48 habitable worlds 48 exoplanetary 48 SpaceX Dragon 48 Exceptional Achievement Medal 48 Apollo Skylab 48 enters lunar orbit 48 Sample Return 48 Charles Elachi 48 Mars landers 48 Carl Marchetto 48 Robotic Exploration 48 NASA Ames 48 astrophysical phenomena 48 WISE spacecraft 48 lunar orbiters 48 JIMO 48 Terrestrial Planet Finder 48 Planetary Protection 48 hypersonic flight 48 STEREO mission 48 circumlunar 48 Foing 48 Joel Sitz 48 ion propulsion 48 Spatiales CNES 48 NASA Jet Propulsion Lab 48 Antenna LISA 48 STSS Demonstration 47 decadal survey 47 Reusable Launch Vehicle 47 Nasa 47 orbiter lander 47 astronautical 47 Mercury Gemini 47 Satish Dhawan 47 planetary 47 EPOXI mission 47 X ray observatory 47 Great Observatories 47 Mars Exploration 47 Heliophysics Division 47 NEOSSat 47 Observatory STEREO 47 CHIPSat 47 lunar module pilot 47 crewed missions 47 Cargo Launch Vehicle 47 JIMO mission 47 mission Chandrayaan 47 highly elliptical orbits 47 Fuk Li Mars 47 Visit SPACE.com 47 Pete Theisinger 47 Mars Pathfinder lander 47 mission Chandrayan 47 Dominic Gorie 47 Simonetta Di Pippo 47 Michael Studinger 47 Alain Berinstain 47 Mars rovers 47 robotic spacecraft 47 astrophysical 47 AIRSS 47 duration spaceflights 47 visit http:/saturn.jpl.nasa.gov 47 Lunar Rover 47 aeronautics 47 orbital insertion 47 outer planets 47 Deep Impact comet 47 RBSP 47 Greenbelt Md. manages 47 spaceborne 47 Cassini Huygens 47 NanTroSEIZE 47 Dalcanton 47 Nasa Jet Propulsion 47 Kepler spacecraft 47 Descent Imager Spectral Radiometer 47 Gerhard Schwehm 46 STP S# 46 robotic probes 46 Altair lunar lander 46 Mars rover Curiosity 46 JWST 46 Evolution Explorer 46 skipper Peggy Whitson 46 robotics 46 Climate Experiment GRACE 46 spacewoman 46 Crew Exploration 46 MAVEN 46 Planetary Society 46 planetary rovers 46 Simonetta Di Pippo ESA 46 Human Spaceflight Microgravity 46 Yinghuo 1 46 Fundamental Aeronautics Program 46 hypersonic 46 JPL 46 GeneSat 46 Mars 46 Craig Tooley LRO 46 aboard Skylab 46 cryosphere 46 Judy Resnik 46 Nasa Ames 46 Diviner instrument 46 orbited Jupiter 46 BepiColombo mission 46 ESA Planck 46 Earth orbit 46 C1XS 46 NASA LCROSS 46 Wolszczan 46 Cometary 46 Neptec 46 NASA STEREO 46 Foton M3 46 geosynchronous 46 COBE satellite 46 orbiting gamma ray 46 NFIRE 46 MARSIS 46 Astrosat 46 reusable hypersonic 46 EarthScope 46 Sojourner rover 46 Space Agency 46 lunar rovers 46 Rosetta spacecraft 46 Mercury flyby 46 HALE UAV 46 John Brunschwyler 46 ADM Aeolus 46 reusable spacecraft 46 NASA twin STEREO 46 astronautics 46 outer space 46 Deep Impact mission 46 ESA Integral 46 Donald Deke Slayton 46 GloPac 45 AFOSR 45 Ed Weiler associate 45 navigate autonomously 45 COSMO SkyMed 45 Shallow Radar instrument 45 Curiosity rover 45 manned spacecraft 45 Jean Pierre Lebreton 45 Astrobiology Magazine 45 Berinstain 45 Ed Weiler NASA 45 THEMIS mission 45 unmanned lunar orbiter 45 interplanetary probes 45 Theodore von Karman 45 interplanetary 45 ESA GOCE 45 Pluto Kuiper Belt 45 astronomical observatories 45 NASA Stratospheric Observatory 45 Hubble Space 45 NSSTC 45 ESA Earth Observation 45 DIXI 45 planetary geology 45 Planetary Lab 45 Helios 2B 45 SIRTF 45 Pan STARRS 45 suborbital spaceflight 45 OSIRIS Rex 45 Systems Mission Directorate 45 polar 45 American Astronautical Society 45 Daniel Sacotte ESA 45 twin Voyager spacecraft 45 Emily Lakdawalla 45 rover 45 Planck spacecraft 45 Cryosat 45 LISA Pathfinder 45 LRO LCROSS 45 Grammier 45 Planetary Laboratory 45 robotic landers 45 Convection Rotation 45 infrared observatory 45 Gemini Apollo 45 observing satellites 45 telescopic observations 45 Kavandi 45 hypersonics 45 observational cosmology 45 Sun Laiyan 45 Laser Interferometer Space 45 Robotic Lunar Exploration 45 Relations Observatory STEREO 45 Red Planet 45 uncrewed 45 NASA Headquarters 45 Centre VSSC 45 Astronaut Julie Payette 45 NewSpace 45 Stardust NExT 45 EarthCARE 45 terraforming Mars 45 operating mines Guanacevi 45 Laboratory MSL 45 Cosmic Background Explorer 45 Ed Weiler 45 windshield wiper maneuver 45 Viking orbiters 45 exo planet 45 journal Acta Astronautica 45 Norm Thagard 44 Kepler observatory 44 inter planetary 44 spacecraft orbited 44 extrasolar planet observations 44 space shuttle 44 NPOESS 44 robotic lander 44 cosmonautics 44 Earth orbiting satellites 44 Canadarms 44 Apollo lunar 44 Planetary Science 44 manager Gerhard Schwehm 44 Rex Geveden 44 NASA Authorization 44 Joel Sitz project 44 Applied Physics Laboratory 44 Jet Propulsion Laboratory JPL 44 Launch Abort System 44 spokesman Michael Braukus 44 STORRM 44 Planck satellite 44 NSBRI 44 Space Shuttle 44 neutrino physics 44 sub orbital spaceflight 44 NASA Goddard 44 laser altimeter 44 intergalactic spaceship 44 Mars moon Phobos 44 Ken Bowersox 44 SMOS Soil Moisture 44 Jet Propulsion Lab 44 Explorer WISE 44 Orbital Space 44 planetary geologist 44 unmanned spacecraft 44 Project Ozma 44 Lunar Roving Vehicle 44 Philae lander 44 gamma ray observatories 44 orbital 44 detect gravitational waves 44 ocean splashdowns 44 GLAST 44 Earth Observing 44 NASA Wallops 44 orbit GEO 44 RADARSAT 2 44 NASA Kepler 44 rovers 44 dimensional atlas 44 Mark N. Sirangelo 44 Bruce Jakosky 44 moon landings 44 Shenzhou manned 44 Opportunity Mars rovers 44 lunar orbiter 44 Comet #P/Churyumov-Gerasimenko 44 Planetary Transits 44 radio occultation 44 Mirelson 44 Lunar Module Pilot 44 Mars Atmosphere 44 ESA Proba 44 Volatile Evolution 44 director Charles Elachi 44 Mars Rover 44 Chandrayan 44 JDEM 44 Jean Pierre Lebreton Huygens 44 ESA SMART 44 NOAO 44 SIM PlanetQuest 44 lunar explorer 44 Science Mission Directorate 44 spacecraft Cassini 44 AMPERE 44 orbiter 44 asteroids comets 44 Moonbase Alpha 44 ESA Rosetta 44 specialists Lisa Nowak 44 NASA Educator Astronaut 44 lunar rover 44 Earth Observation 44 AMASE 44 John Callas rover 44 habitable planets 44 ARRL AMSAT 44 unmanned 44 Spudis 44 Investigation DIXI 44 Hyakutake 44 mineralogical mapping 44 Shenzhou orbital modules 44 Predator drone flies 44 manager Alan Thirkettle 44 NASA Cassini 44 Foton M2 44 Cosmonaut Yuri Gagarin 44 unmanned robotic 43 SPACE.com 43 asteroid deflection 43 lander 43 Hubble Space Telescope 43 Galilean satellites 43 SETI Search 43 Cernan 43 ramjet scramjet 43 Spacewatch 43 Shallow Subsurface Radar 43 lunar lander 43 Interstellar Boundary Explorer 43 Viking landers 43 nanosatellites 43 Dyna Soar 43 scientist Greg Delory 43 Galaxy Evolution 43 Andrea Accomazzo 43 ICESat 43 Virgin Galactic unveils 43 spacecrafts 43 GPS IIF 43 shuttle Discovery STS 43 twin rovers Spirit 43 Nasa Kepler 43 meteorological satellites 43 moon 43 EELV 43 specialists Scott Parazynski 43 Hubble 43 spaceflights 43 Lunar Reconnaissance 43 SRON 43 asteroid Vesta 43 IODP 43 propulsion systems 43 #P/Churyumov-Gerasimenko 43 Earthlike planets 43 Solar System 43 Buzz Aldrin Apollo 43 Fermi Gamma ray 43 Planetary Science Division 43 physics astrophysics 43 Mars Color Imager 43 maritime subsurface 43 Lunar Orbiter 43 lunar 43 orbiting observatory 43 decadal surveys 43 Aerojet propulsion 43 Educator Astronaut 43 NASA Lunar Prospector 43 comets meteors 43 inhabitable planets 43 geospace science 43 Panoramic Camera 43 ISS resupply 43 Wally Schirra 43 comets asteroids 43 Shuttle Challenger 43 theoretical astrophysics 43 hyperspectral 43 UA Lunar 43 Kepler 9c 43 orbit insertion 43 Space Shuttle Endeavor 43 Hubble Space Telescope HST 43 Flyby spacecraft 43 IceBridge 43 Giacconi 43 VASIMR 43 propulsion subsystem 43 Space ENvironment GEochemistry 43 unpiloted 43 probe Huygens 43 Pilot George Zamka 43 particle astrophysics 43 microgravity experiments 43 Rover MER 43 Charon Pluto 43 LCROSS mission 43 comet chaser 43 buckypaper virtually 43 William Gerstenmaier 43 Laboratory Pasadena 43 Atlantis Undocks From 43 Astronautical Society 43 Spectroscopic Explorer 43 Carina constellation 43 infrared telescope 43 Martian arctic 43 SELENE probe 43 astronomical observations 43 Herschel Planck 43 Astrophysical Research 43 manned Shenzhou 43 astrometric 43 Mars Climate Sounder 43 Situ Resource 43 Paulo Nespoli 43 Elachi 43 Esrange 43 HiRISE camera aboard 43 Extra Terrestrial Intelligence 43 Rusty Schweickart 43 Volker Liebig 43 alien civilizations 43 Interorbital Systems 43 Applied Physics Lab 43 operationally responsive space 43 Telescope LSST 43 Voyager spacecraft 43 commander Dmitry Kondratyev 43 John Nousek 43 X ray telescope 43 Atlas IIAS 43 Orion CEV 43 geospace 43 Hakan Svedhem 43 Orion LAS 43 Space Telescope GLAST 43 Launch Scrubbed 43 Centennial Challenges 43 BMC2 43 Mars orbiter 43 D CIXS 43 Pascale Ehrenfreund 43 gamma ray observatory 43 Ranging MESSENGER spacecraft 43 Bernard Foing 43 Infrared Astronomy 43 Mars unfeasible 43 Stratospheric Observatory 43 Hubble telescope 42 UKIRT 42 ESA Herschel 42 Operation IceBridge 42 AERONET 42 Mars rover 42 Polar Epsilon 42 Bruce Banerdt 42 NEOWISE 42 Commercial Spaceflight Federation 42 NPOESS Preparatory Project 42 journal Meteoritics 42 Lori Garver 42 Cathy Peddie LRO 42 Orbiter LRO 42 Solar Dynamics Observatory 42 National d' Etudes 42 Bepi Colombo 42 NASA WMAP 42 celestial mechanics 42 Hubble Telescope 42 polarimetric 42 LOCAD PTS 42 GOCE 42 THEMIS 42 AFRL 42 Stardust NExT mission 42 Douglas Hudgins Kepler 42 Cassini 42 GRAIL 42 space module Tiangong 42 suborbital 42 Arik Posner 42 George Zamka 42 Jill Tarter 42 Long Wavelength Array 42 NPO Lavochkin 42 Lockheed Martin SBIRS 42 Mars Opportunity rover 42 Apollo Soyuz 42 Kuiper Belt Objects 42 hypersonic glider 42 Julie Payette 42 Charles Beichman 42 Webb Telescope 42 Voyager probes 42 Lunar CRater Observation 42 Frederick Sturckow 42 Rapid Intensification Processes 42 Dordain 42 Mars Reconnaissance Orbiter MRO 42 Sputnik satellite 42 Deep Impact Extended 42 extrasolar planetary 42 Nasa spacecraft 42 Hubble astronomer 42 INSAT 3D 42 Orbiter MRO 42 microwave remote sensing 42 Earth Observation System 42 APXS 42 RPWS 42 ESA CNES 42 Laboratory JPL Pasadena 42 orbital spaceflight 42 Oefelein piloted 42 Opportunity rovers 42 ExoMars Trace Gas 42 Martian rovers 42 Aeronomy 42 Alphabus 42 extravehicular 42 colonize Mars 42 Steve Squyres 42 Vostok spacecraft 42 EPOXI 42 landers 42 planetary sciences 42 FANUC Robotics maintains 42 NASA Space Shuttle 42 Shenzhou VII mission 42 NASA ICESat 42 planetary spacecraft 42 ChemCam 42 flyby Cassini 42 Konstantin Feoktistov 42 TATRC 42 NASA Stardust NExT 42 robotic Canadarm 42 Moon Mineralogy Mapper M3 42 ESA Cluster 42 polar expeditions 42 William Readdy NASA 42 twin Mars rovers 42 prebiotic chemistry 42 elementary particle physics 42 Characterization EPOCh 42 Mini SAR 42 extraterrestrial civilizations 42 stellar occultations 42 Security GMES 42 GSLV rockets 42 GPS IIR M 42 Christopher Scolese 42 Multi Purpose Crew 42 nanosystems 42 WMAP satellite 42 Rick Grammier 42 Commander Charlie Hobaugh 42 Mars rovers Spirit 42 RLEP 42 Observatory SDO 42 Earth orbit LEO 42 Apollo lunar landings 42 cometary 42 NASA Astrobiology 42 Mastcam 42 deorbiting 42 Mars lander 42 lunar surface 42 Atmospheric Oceanic 42 Ouyang Ziyuan 42 Christopher Chyba 42 Gaele Winters 42 Kirk Shireman 42 Lennard Fisk 42 countdown dress rehearsal 42 Casani 42 Kiruna Sweden 42 Owen Garriott 42 ESRIN 42 Chiaki Mukai 42 Exobiology 42 Yannick d' Escatha 42 Mike Suffredini NASA 42 spacefaring civilization 42 Kepler telescope 42 robotic explorer 42 hunting Kepler telescope 42 robotic geologists 42 Saturn Enceladus 42 Keennon 42 shuttle Endeavour STS 42 Pete Worden 42 Cassini Orbiter 42 Particle physics 42 Ocean Observing 42 Gene Cernan 42 NEEMO 42 Foton M3 mission 42 OSTM Jason 2 42 Martian moon Phobos 42 Astrobiology Institute 42 manned lunar mission 42 humanoid robotics 42 Titan flybys 42 Orion Crew 42 ESA 42 Cleon Lacefield Lockheed Martin 42 NASA Jet Propulsion 42 NASA MESSENGER spacecraft 42 Rosetta orbiter 42 Stardust spacecraft swooped 42 Ares rocket 42 Greg Delory 42 PASADENA Calif. NASA 41 autonomous underwater 41 Herschel Space 41 Comet Boethin 41 robotic 41 Saturn Cassini 41 Epoxi 41 Exopolitics 41 CloudSat 41 Educator Astronauts 41 GALEX 41 Shuttle Endeavour docks 41 DEPTHX 41 Lindenburger 41 moons circling 41 Mars rovers Opportunity 41 THEMIS satellites 41 GeneSat 1 41 Orbiter spacecraft 41 atmospheric oceanic 41 SBIRS GEO 41 Chairman G Madhavan 41 Orion spaceship 41 Gamma ray burst 41 Krishnaswamy Kasturirangan 41 Astrobiology 41 CAIB recommendations 41 Rubi ka 41 Comet Machholz 41 martian 41 Dan Werthimer 41 extrasolar planetary systems 41 Desert RATS 41 ESA Huygens 41 polar regions 41 Gene Kranz 41 permanently shadowed craters 41 Smos 41 Huygens lander 41 spokesman Robert Mirelson 41 Spacewalker 41 Jean Pierre Lebreton ESA 41 chairman Madhavan Nair 41 rovers Spirit 41 NASA JPL 41 Lunokhod 41 Shuttle astronaut 41 Spacelab 41 exoplanets planets 41 Block IIF 41 TIROS 41 comet Churyumov Gerasimenko 41 SMOS 41 Yury Gagarin 41 Satellite Aided Tracking 41 O. Hobaugh 41 Takao Doi 41 Johns Hopkins Applied Physics 41 Envisat ASAR 41 spaceward 41 Next Giant Leap 41 Heidemarie M. 41 retroreflector 41 ESOC 41 Alexander Samokutyayev 41 Spaceward Bound 41 lunar explorers 41 Environmental Satellite POES 41 Kliper 41 ESA CryoSat 41 Multi Object Spectrograph 41 Operationally Responsive Space 41 comet flyby 41 PSLV C9 41 Spaceguard Survey 41 O OREOS 41 Lunar Module 41 lunar orbiter Chang'e 41 Earth asteroids 41 suborbital spacecraft 41 ultraviolet spectrograph 41 Klumpar 41 Shackleton Crater 41 Environment Explorer LADEE 41 Mössbauer spectrometer 41 Shuttle Discovery docks 41 Astronaut Scholarship 41 Junichiro Kawaguchi 41 Roddenberrys remains 41 Aboard Endeavour 41 NASA EPOXI mission 41 payloads 41 Ken Edgett 41 geo synchronous 41 Churyumov Gerasimenko 41 Caltech Jet Propulsion 41 GLAST telescope 41 missions 41 aquanaut 41 SHARAD 41 astroparticle physics 41 Rain overcast sky 41 PlanetQuest 41 geo stationary orbit 41 Near Infrared Camera 41 Ellison Onizuka 41 Geeky tweeters 41 Huygens Probe 41 Fermi Telescope 41 waning gibbous 41 SpaceShip One 41 Deep Impact eXtended Investigation 41 propulsion 41 rocketry 41 spaceflyers 41 Comet Hartley 2 41 telerobotic 41 gravitational microlensing 41 astronaut Jack Lousma 41 INSAT satellite 41 Commercial Reusable Suborbital 41 commander Charlie Hobaugh 41 Paul Spudis 41 physics astronomy 41 optical interferometry 41 aerobraking 41 Crew Launch Vehicle 41 AFSO# 41 Array ALMA 41 Jennifer Heldmann 41 Martian soil 41 Interplanetary Internet 41 ARCTAS 41 Jayant Narlikar 41 Peter Theisinger 41 extrasolar 41 ESMD 41 Heliospheric Investigation 41 Wilkinson Microwave Anisotropy Probe 41 entered lunar orbit 41 COROT 41 chairman G. Madhavan 41 lunar orbit 41 GMES 41 Martian arctic plains 41 Planetary Science Institute 41 Follow SPACE.com 41 ESA Astronaut 41 Proba 2 41 Ranging spacecraft 41 spacefaring 41 Nasa astronaut 41 hyper spectral 41 SM4 41 Climate Sounder 41 Shana Dale 41 Megha Tropiques 41 Japan Kibo laboratory 41 Cassini Huygens Mission 41 Aquarius SAC 41 CAPE CANAVERAL Astronauts 41 Suborbital 41 autonomous rendezvous 41 FASTSAT 41 Magnificent Desolation 41 Antarctic 41 particle physics 41 Infrared Pathfinder Satellite 41 Woodrow Whitlow 41 Moderate Resolution Imaging 41 Vikram Sarabhai Space 41 Neutron Spectrometer 41 whiz harmlessly 41 Krimigis 41 Galileo spacecraft 41 Exploring Planets 41 synthetic genomics 41 Readdy 41 Zhang Jianqi 41 rover Sojourner 41 astrometry 41 glaciology 41 David Wettergreen 41 HiRISE 41 Observatory astronomer 41 Cygnus spacecraft 41 moonbase 41 icy moons 41 pulsating aurora 41 Joyce Winterton 41 astronaut 41 computational simulations 41 NEAR Shoemaker 41 Atacama Large Millimeter Array 41 UCAS D 41 Magnificent Desolation Walking 41 spaceports 41 Vakoch 41 TDRS K 41 lidar instrument 40 Astronautical Science 40 I3P 40 Infrared Telescope Facility 40 SPHERES 40 NASA astrobiology 40 Infrared Astronomy SOFIA 40 permanently shadowed crater 40 reusable manned spacecraft 40 unmanned rover 40 extraterrestrial 40 noctilucent clouds 40 discover Fomalhaut 40 Shuttle astronauts 40 NASA Landsat 40 Minotaur IV 40 Louis Stodieck 40 Regolith Excavation Challenge 40 Nasa Mars Odyssey 40 indigenous cryogenic 40 International Space Station 40 von Weyhe 40 planetary atmospheres 40 X ray telescopes 40 Enceladus flybys 40 astronomer 40 computational sciences 40 polar orbiting 40 telerobotics 40 geosciences 40 NAOMS 40 STSS Demo 40 Craig Steidle 40 SpaceshipTwo 40 ARCTUS 40 Russian cosmonaut Yuri Gagarin 40 Viking Lander 40 Oceansat 2 40 Lee Joo jin 40 engineer Timothy Kopra 40 Svedhem 40 SMEX 40 Japanese Aerospace Exploration 40 asteroid Steins 40 Anisotropy Probe WMAP 40 Glonass K 40 Jeffrey Kargel 40 Polar Regions 40 gamma ray detector 40 unmanned underwater 40 lunar perigee 40 commander Zhai Zhigang 40 gamma ray astronomy 40 hyperspectral sensors 40 Lunar Surface 40 microgravity 40 lunar outpost 40 DSTO 40 Martian rover 40 Laser Interferometer Gravitational Wave 40 Werthimer 40 TanDEM X 40 McKay planetary scientist 40 Sasselov 40 twin rover Opportunity 40 Nasa Deep Impact 40 Galactic cosmic rays 40 Wernher Von Braun 40 director Gene Kranz 40 remote sensing satellite Resourcesat