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(Click for frequent words.) 73 orbit 72 orbits 71 orbited 70 spacecraft 66 International Space Station 65 orbital rendezvous 63 Saturn Cassini 63 Kepler 9c 62 Earth orbit 62 planetary Transits 61 gaseous planet 61 orbiter 61 orbital 61 Epsilon Eridani 60 planets orbits 60 Hubble 60 unmanned spacecraft 60 asteroid 60 Upsilon Andromedae 60 Fomalhaut b 60 Cassini Huygens 59 Kuiper belt object 59 Jovian moons 59 comets orbiting 59 Nasa spacecraft 59 Hubble Space Telescope 59 New Horizons spacecraft 59 orbiting spacecraft 59 Solar TErrestrial RElations Observatory 58 Churyumov Gerasimenko 58 Proxima Centauri 58 manned Shenzhou 58 cosmic cannibal 58 flyby spacecraft 58 Japan Kibo laboratory 58 orbited Earth 58 Comet Churyumov Gerasimenko 58 IBEX spacecraft 58 highly elliptical orbit 58 orbiting Saturn 58 planets 58 orbiting outpost 58 orbiting observatory 58 SIRTF 58 asteroid Itokawa 58 TrES 4 58 Zeta Ophiuchi 58 orbiting laboratory 58 orbiting complex 58 planet HD #b 58 spacecraft Cassini 57 highly elliptical orbits 57 spacecraft orbiting 57 Cassini Huygens spacecraft 57 distant galaxy 57 Gliese #c 57 transiting exoplanet 57 moons orbiting 57 orbiting Hubble Space Telescope 57 WISE spacecraft 57 Hubble telescope 57 Space Agency 57 planet orbiting 57 exoplanetary 57 Mars Odyssey spacecraft 57 Cassini 57 WASP #b 57 Upsilon Andromedae b 57 asteroids 57 elliptical orbit 57 innermost planet 57 sunlike star 57 COROT 57 star Gliese 57 Discovery undocks 57 Lunar Reconnaissance Orbiter LRO 57 Rosetta orbiter 57 Stardust spacecraft 57 orbiters 57 orbital outpost 57 astronomers 57 Comet Hartley 57 Manned missions 57 Ariane rocket 57 interplanetary spacecraft 57 #P/Churyumov-Gerasimenko 56 asteroids orbiting 56 elongated orbit 56 galaxy M# [002] 56 ISS 56 gravitationally bound 56 HD #b [002] 56 crewed spacecraft 56 aboard Atlantis 56 Atlantis rocketed 56 Zvezda module 56 retrograde orbit 56 Voyager probes 56 gamma ray observatory 56 Andromeda Galaxy 56 Shuttle undocks 56 Comet #P/Churyumov-Gerasimenko 56 spaceward 56 millisecond pulsar 56 satellites orbiting Earth 56 Atlantis undocks 56 planet orbits 56 X ray telescope 56 moons Phobos 56 Solar Terrestrial Relations 56 outer planets 56 planet Uranus 56 moon Io 56 lunar orbits 56 supernova explosion 56 Andromeda galaxy 56 Shenzhou VI capsule 56 exoplanets planets 56 extrasolar 56 comet #P/Churyumov-Gerasimenko 56 spiral galaxy 56 exoplanets orbiting 56 Flyby spacecraft 56 satellites orbiting 56 Gliese #d 56 mu Arae 56 planets moons 56 Curiosity rover 56 galaxy M# [001] 56 X ray observatory 56 telescope 56 X ray binary 56 NASAs 56 planets orbiting 56 orbital laboratory 55 Oort Cloud 55 spaceship 55 orbiting satellites 55 Milky Way Galaxy 55 giant elliptical galaxy 55 satellites 55 geo stationary orbit 55 aboard Skylab 55 Endeavour undocks 55 eccentric orbits 55 Kepler spacecraft 55 pressurized module 55 Phobos Grunt 55 docking compartment 55 galaxy 55 orbiting telescope 55 circular orbits 55 particle detector 55 Voyager spacecraft 55 dexterous robot 55 asteroid Vesta 55 galaxy NGC 55 X ray telescopes 55 Fermi telescope 55 slender crescent 55 Epsilon Aurigae 55 Baikonur Kazakhstan 55 GALEX 55 orbital debris 55 HL Tau 55 Nasa 55 HD #b [001] 55 extrasolar planet 55 Orbiting 55 unmanned probes 55 geosynchronous orbit 55 elongated orbits 55 circular orbit 55 Rosetta spacecraft 55 astronauts 55 NASA 55 Mars 55 comet 55 Galileo spacecraft 55 Mikhail Tyurin 55 GJ#b 55 Pirs Docking Compartment 55 spacecrafts 55 Beta Pictoris 55 Jupiter Ganymede 55 constellation Carina 55 Canadarms 55 orbiter Cassini 55 LCROSS 55 inhabitable planets 55 THEMIS satellites 55 BepiColombo 54 Space Station 54 brown dwarf 54 constellation Hercules 54 HD#b 54 Earth asteroids 54 Comet Hartley 2 54 robotic spacecraft 54 EPOXI 54 Mars Pathfinder lander 54 Eta Carinae 54 Triangulum 54 radial velocity 54 EPOXI mission 54 Shuttle Discovery docks 54 NASA Kepler 54 outermost planets 54 Cancri e 54 Gliese #e 54 Cassini spacecraft 54 comet chaser 54 Odyssey orbiter 54 constellation Ursa Major 54 galactic disk 54 orbiting observatories 54 volcanic moon Io 54 orbiting Kepler telescope 54 stationary lander 54 exo planet 54 Geminga 54 Russian cosmonaut Alexander Kaleri 54 CoRoT satellite 54 commander Dmitry Kondratyev 54 Corot 7b 54 Shuttle Discovery blasts 54 robotic rovers 54 AU Mic 54 maneuvering thrusters 54 Terrestrial Planet Finder 54 entire Milstar constellation 54 Solar Dynamics Observatory 54 Shuttle docks 54 amateur skywatchers 54 Convection Rotation 54 planets orbiting sun 54 Helios 2B 54 Martian orbit 54 Observatory SDO 54 rover Spirit 54 comet Churyumov Gerasimenko 54 Chang'eI 54 comet Hale Bopp 54 SuitSat 54 icy moons 54 Soyuz rocket 54 exo planets 54 NASA MESSENGER spacecraft 54 circumstellar disks 54 constellation Pegasus 54 moon Ganymede 54 protoplanetary 54 Mars rovers Spirit 54 Anik F3 54 supergiant star 54 Hubble Space Telescope HST 54 Comet Halley 54 Deep Impact flyby spacecraft 54 extrasolar planets 54 comet nucleus 54 ATV Johannes Kepler 54 impactor spacecraft 54 Carina constellation 54 Gerhard Schwehm 54 neutron star 53 tidal bulge 53 shuttle Atlantis 53 Saturn moons 53 Alpha Magnetic Spectrometer 53 Deep Impact comet 53 Martian rovers 53 Ed Weiler NASA 53 Skynet 5C 53 comets asteroids 53 Milky Way galaxy 53 synchronous orbit 53 Soyuz rocket carrying 53 Comet Machholz 53 Zarya module 53 Shuttle Endeavour docks 53 infrared telescope 53 Pluto Charon 53 Relations Observatory STEREO 53 Ulysses spacecraft 53 rover Opportunity 53 Shenzhou capsule 53 transiting planets 53 interplanetary 53 spacewalk 53 Evolution Explorer 53 lander 53 lunar orbit 53 Horizons spacecraft 53 spiral galaxy NGC 53 spacecraft orbited 53 Atlantis Undocks From 53 NEOSSat 53 Astronaut Leroy Chiao 53 NASA Stardust spacecraft 53 spaceflyers 53 Red Rectangle 53 exoplanet orbiting 53 PSLV C6 53 Canadian Julie Payette 53 Epoxi 53 interstellar particles 53 Lunokhod 53 Earthlike planet 53 SIM PlanetQuest 53 exoplanets 53 detect gravitational waves 53 VY Canis Majoris 53 star Proxima Centauri 53 moon Charon 53 meteoroid 53 Foton M3 53 Kuiper Belt Objects 53 Naoko Yamazaki 53 NASA Cassini 53 retroreflector 53 NASA STEREO 53 Shuttle Atlantis blasts 53 Hubble Space telescope 53 HM Cancri 53 Jupiter Icy Moons 53 protoplanets 53 SOHO spacecraft 53 elliptical orbits 53 #/#-ton truss 53 GJ #b [002] 53 fiery reentry 53 Kibo module 53 engineer Oleg Kononenko 53 exosolar planets 53 undocks 53 Malenchenko 53 sized planets orbiting 53 preset orbit 53 Saturn outermost moon 53 ESA SMART 53 Lunar Prospector 53 Planetary Transits 53 planets Uranus 53 globular cluster 53 infrared telescopes 53 Jupiter flyby 53 Shuttle Atlantis docks 53 gamma ray burst 53 Titan flyby 53 Fincke radioed 53 planetary 53 CAPE CANAVERAL Astronauts 53 perigee 52 orbit GEO 52 polar orbit 52 orbital velocity 52 outer space 52 smallest exoplanet 52 ROCSAT 2 52 Spacewalkers Scott Parazynski 52 Ringed Planet 52 Deep Impact craft 52 STEREO spacecraft 52 STSS Demo 52 protoplanet 52 constellation Sagittarius 52 Huygens descent 52 orbiting gamma ray 52 Neptune Uranus 52 Mars moon Phobos 52 transiting planet 52 Lunar Reconnaissance Orbiter 52 Oort cloud 52 S/# P2 52 Kepler #b 52 WISE mapped 52 Kazakhstan Baikonur Cosmodrome 52 astrometry 52 lunar module Eagle 52 Martian rover 52 Wolf Rayet star 52 deorbiting 52 Centaur rocket 52 magnetic spectrometer 52 Yinghuo 1 52 MESSENGER spacecraft 52 thin crescent 52 Antennae Galaxies 52 Huygens mission 52 WISE telescope 52 planets comets 52 Sojourner rover 52 GQ Lupi 52 Rassvet 52 Endeavour docked 52 NASA THEMIS 52 undocked 52 planets circling 52 Large Magellanic Cloud 52 irregularly shaped asteroid 52 manned spaceships 52 space shuttle Discovery 52 Mars Reconnaissance Orbiter MRO 52 BP Psc 52 orbit insertion 52 star Fomalhaut 52 ATLAS detector 52 Jupiter Uranus 52 Virgo cluster 52 manned spacecraft Shenzhou VI 52 Shenzhou spacecraft 52 orbiting Mars 52 Kuiper Belt object 52 Yuri Shargin 52 windshield wiper maneuver 52 Planck satellite 52 STEREO mission 52 NASA rovers 52 observatory 52 planemos 52 CALIPSO 52 geo synchronous 52 shuttle Discovery STS 52 Pirs module 52 Valery Tokarev 52 ringed planet 52 perihelion 52 Galaxy Evolution 52 Reconnaissance Orbiter 52 Foton spacecraft 52 GLAST 52 Sputnik beeped 52 TrES 52 Discovery undocked 52 Saturnian moon Titan 52 planets orbiting distant 52 Kounotori2 52 comets 52 Tempel 1 52 starshade 52 orbital inclination 52 moon Deimos 52 ESA XMM Newton 52 Philae lander 52 NPO Lavochkin 52 NASA Kepler spacecraft 52 solar flares 52 micrometeoroids 52 Orion nebula 52 galaxies 52 lunar surface 52 CoRoT 52 NASA Cassini orbiter 52 Ranging spacecraft 52 rovers Spirit 52 Yury Malenchenko 52 planet Gliese #g 52 NFIRE satellite 52 NASA Kepler telescope 52 Cancri 52 Earthlike planets 52 asteroids Ceres 52 orbits Saturn 52 elliptical galaxy 51 THEMIS spacecraft 51 Earth radii 51 trans Neptunian objects 51 rocket thrusters 51 Gliese #g 51 Charon Pluto 51 Bug Nebula 51 Russians Alexander Kaleri 51 probe Huygens 51 Toutatis 51 occultations 51 extrasolar planet HD #b 51 Orbiter LRO 51 robotic explorer 51 XMM Newton 51 lunar landers 51 hubble 51 VIRTIS 51 Beta Pictoris b 51 particle detectors 51 shuttle Discovery 51 astrophysicists 51 Comet Holmes 51 Russian cosmonaut Pavel Vinogradov 51 Nasa Mars Odyssey 51 Japanese Kibo laboratory 51 planets asteroids 51 constellation Aquarius 51 shuttle Endeavour STS 51 Space Shuttle Atlantis 51 constellation Centaurus 51 Ring Nebula 51 geosynchronous satellites 51 Russian crewmate Salizhan 51 eclipsing binary 51 lensing galaxy 51 cluster NGC 51 XTE J# 51 Alpha Centauri 51 probe Chang'e 51 Cosmodrome 51 Christer Fuglesang unreeled 51 ammonia coolant tank 51 moonlet 51 LCROSS spacecraft 51 JWST 51 gravitationally 51 galactic 51 Trojan asteroids 51 planetoid 51 orbiting telescopes 51 particle physics experiment 51 shuttle undocked 51 Messenger spacecraft 51 ALMA antennas 51 geosynchronous 51 Nicole Stott 51 Galilean moons 51 Kuiper belt 51 gravitational tides 51 accretion disks 51 Fornax cluster 51 urine recycler 51 Shuttle Endeavour blasts 51 cosmic ray detector 51 EPOXI spacecraft 51 Solar System 51 Pluto Eris 51 brown dwarfs 51 GRBs 51 Konacki 51 Japanese Kibo lab 51 NanoSail D 51 Redu Belgium 51 Neutron stars 51 asteroid Steins 51 commander Leroy Chiao 51 Elenin 51 Shuttle Discovery arrives 51 Commander Leroy Chiao 51 resident Gregory Chamitoff 51 geostationary orbits 51 Geosynchronous orbit 51 NASA EPOXI mission 51 Spaceguard Survey 51 gravitational interactions 51 Interstellar Boundary Explorer 51 comet hurtling 51 Hinode 51 orbiting ISS 51 Progress resupply 51 moon 51 orbiting lab 51 lunar orbiter 51 starboard truss 51 Kepler telescope 51 O OREOS 51 Dmitry Kondratyev 51 functioning gyroscopes 51 constellation Virgo 51 spacemen Timothy Kopra 51 exoplanet hunter 51 whiz harmlessly 51 super Earths 51 P/# A2 51 MetOp satellite 51 Mandushev 51 NASA LCROSS 51 Russian crewmate Yuri 51 false decompression alarms 51 Earth orbiting satellites 51 Saturnian moon 51 spiral galaxy Messier 51 largest moon Charon 51 moon Phobos 51 JAXA 51 terrestrial planets 51 orbital insertion 51 manned spaceflight 51 Spitzer Space Telescope 51 Mars# 51 ExoMars rover 51 HAMSAT 51 Greg Chamitoff 51 gravitational pulls 51 Comet Tempel 1 51 millisecond pulsars 51 asteroidal 51 Mars landers 51 QQ# 51 Kuiper Belt Object 51 comet flyby 51 circumlunar 51 interstellar cloud 51 comet Tempel Tuttle 51 BLG #Lb 51 APXS 51 Earth magnetotail 51 Orionids 51 space shuttle 51 Orion Nebula 51 gravitational interaction 51 cosmological distances 51 Huygens lander 51 lander rover 51 orbiter lander 50 Wolszczan 50 interacting galaxies 50 ray Space Telescope 50 Kliper 50 Svedhem 50 Roman Romanenko 50 geostationary orbit 50 waning gibbous 50 Grammier 50 exosphere 50 starburst galaxy 50 brightest supernova 50 docked flawlessly 50 microlensing 50 unmanned lunar 50 aphelion 50 elliptical galaxy NGC 50 Mars Opportunity rover 50 X ray Observatory 50 reentry capsule 50 shepherding spacecraft 50 remote sensing satellite Resourcesat 50 Space Infrared Telescope 50 Cosmic Microwave Background 50 rovers 50 INSAT 4CR 50 twin rover Opportunity 50 manned spacecraft 50 Giove B 50 rocky planets 50 Cassini flyby 50 Uranus Neptune 50 orbital resonance 50 Herschel Space 50 PSR J# 50 jovian 50 Saturnian 50 Shuttle Endeavour undocks 50 geo synchronous transfer 50 moons circling 50 spokesman Michael Braukus 50 Cygnus Lyra region 50 space shuttle Endeavour 50 XMM Newton X ray 50 Huygens 50 cometary debris 50 Paulo Nespoli 50 commander Sergei Volkov 50 RQ# 50 spacecraft Hayabusa 50 habitable planet 50 MErcury Surface Space ENvironment 50 Compton Gamma Ray 50 Deep Impact probe 50 asteroids comets 50 moons orbiting Pluto 50 gravitational microlensing 50 Soyuz spacecraft docked 50 globulars 50 Pluto 50 Shuttle Endeavor 50 periodic dimming 50 ionized gas 50 aboard Soyuz spacecraft 50 Itokawa 50 Orbital Express 50 protoplanetary disk 50 barred spiral galaxy 50 CoRoT 7b 50 Global Surveyor 50 constellation Cassiopeia 50 Kuiper belt objects 50 NuSTAR 50 cosmic ray 50 Shuttle Atlantis undocks 50 dwarf galaxy 50 extrasolar planets orbiting 50 ESO VLT 50 Apollo missions 50 Akatsuki engines 50 magnetars 50 HAT P 50 Soyuz TMA spacecraft 50 Mercury Uranus 50 merging galaxies 50 Cosmonaut Yuri Gagarin 50 Hubble Telescope 50 Hot Jupiters 50 robotic rover 50 Garret Reisman 50 pulsar 50 spacewalks 50 Discovery undocking 50 gravitational tugs 50 Hayabusa probe 50 NFIRE 50 Astronaut Sunita Williams 50 galactic mergers 50 Jupiter moons 50 lunar missions 50 shuttle 50 LRO spacecraft 50 electric ion propulsion 50 celestial object 50 Perseus Cluster 50 Permanent Multipurpose Module PMM 50 geostationary 50 Soyuz 50 geosynchronous satellite 50 Space shuttle undocks 50 galactic cosmic rays 50 planetary nebulae 50 ESA Herschel 50 interstellar dust samples 50 planetary missions 50 S6 truss 50 Kounotori 50 Jupiter Icy Moons Orbiter 50 Shuttle Docks 50 spaceflight participant 50 distant quasars 50 Mauna Kea Hawaii 50 STEREO 50 Europa Orbiter 50 Wilkinson Microwave Anisotropy Probe 50 heaviest payloads 50 Explorer WISE 50 lunar equator 50 Foton M3 spacecraft 50 antisatellite weapon 50 Cassini spacecraft orbiting 50 orbiting Hubble telescope 50 shuttle orbiter 50 red supergiant 50 exoplanet 50 Nikolai Budarin 50 geosynchronous orbits 50 Very Large Telescope 50 shuttle Endeavor 50 supermassive black hole 50 Uranus Jupiter 50 NASA Far Ultraviolet 50 LORRI 50 occulted 50 comet Tempel 1 50 Samokutyaev 50 Atlantis undocked 50 neutron spectrometer 50 booster rockets 50 Gliese 50 radial velocity technique 50 Saturn Jupiter Uranus 50 Shenzhou VII spacecraft 50 Kepler Mission 50 Sombrero Galaxy 50 astronaut Peggy Whitson 50 Salizhan Sharipov 50 prograde 50 spacewalkers Scott Parazynski 50 OGLE TR #b 50 Japan Hayabusa spacecraft 50 FASTSAT 50 orbited Jupiter 50 NASA twin rovers 50 Daniel Tani 50 look distractingly cartoony 50 Automated Transfer Vehicle 50 Frick radioed 50 spaceplane 50 commander Pam Melroy 50 Comet #P 50 Discovery payload bay 50 Opportunity rovers 50 Endeavour astronauts 50 plutoids 50 bone jarring descent 50 particle physics detector 50 Omega Centauri 50 Soyuz capsule 50 stellar occultation 50 ferrying astronauts 50 GIOVE B 50 Orbiter MRO 50 Butterfly Nebula 50 Venusian surface 50 orbiting Chandra 49 binary asteroid 49 asteroid belt 49 NGC #A 49 Hubble orbits 49 thruster rockets 49 manned spaceship 49 Baikonur Cosmodrome 49 Shenzhou VI craft 49 shuttle undocks 49 Saturnian moons 49 Galilean satellites 49 retrograde orbits 49 protostar 49 WMAP satellite 49 foreground galaxy 49 constellation Libra 49 Globalstar satellites 49 Cosmonauts Sergei Volkov 49 telescopes 49 David Southwood ESA 49 Shenzhou V spacecraft 49 AB Aurigae 49 MARSIS radar 49 Russian cosmonaut Salizhan Sharipov 49 Martian moons Phobos 49 ESA Integral 49 spacewalkers 49 shuttle fleet 49 interstellar 49 Rockot launch 49 Pleiades star 49 SCISAT 49 rover 49 ESA Rosetta 49 unstowed 49 Phobos 49 Japanese Kibo module 49 Mars Odyssey orbiter 49 Russian Salizhan Sharipov 49 LADEE 49 Rosetta comet chaser 49 Astronaut Sandra Magnus 49 Antenna LISA 49 HEO payload 49 Shenzhou V 49 Herschel Planck 49 geosynchronous Earth 49 impactor 49 Express orbiter 49 Harmony Node 49 MetOp 49 Russia Baikonur cosmodrome 49 Fomalhaut 49 ion propulsion 49 planets orbiting stars 49 Corot 9b 49 Kepler Space Telescope 49 ESOC 49 Ed Weiler 49 interstellar dust grains 49 cosmic 49 WISE infrared 49 Russian cosmonaut Yuri Malenchenko 49 CoRoT 9b 49 Space Telescope 49 George Zamka 49 Pleiades 49 ESA Mars 49 Arches Cluster 49 twin rovers Spirit 49 Soyuz spacecraft 49 Eyharts 49 space shuttle undocked 49 Infrared Array Camera 49 Endeavour astronauts embarked 49 Venus Climate Orbiter 49 unmanned Progress 49 Chandrayaan 49 globular cluster M# 49 Samuel Oschin Telescope 49 HD# [002] 49 Earths orbiting 49 celestial observations 49 reconnaissance orbiter 49 Iridium satellites 49 GJ #b [001] 49 Russian cosmonauts Sergei Volkov 49 Nasa Jet Propulsion 49 Hubble servicing 49 constellation Vulpecula 49 Russian Dnepr rocket 49 Saturn moon 49 orbiter Mars Odyssey 49 Mars rover 49 entered lunar orbit 49 Earth asteroid Itokawa 49 thruster firings 49 NASA Interstellar Boundary 49 coastal Naro 49 tow dollies 49 lunar orbiter Chandrayaan 49 Red Planet 49 CHIPSat 49 chief Vladimir Solovyov 49 Cassini orbiter 49 Pleiades cluster 49 magnetar 49 neutron stars 49 Nasa Kepler 49 Cassini Equinox 49 magnetotail 49 interstellar dust 49 moonlets 49 orbital module 49 Atlantis payload bay 49 Sun synchronous orbit 49 Geosynchronous Transfer Orbit 49 Vourlidas 49 IRAS #-# 49 deorbit 49 outermost planet 49 Cape Canaveral Air Force 49 gamma ray bursts 49 Aboard Endeavour 49 KBOs 49 human spaceflight 49 twin rover Spirit 49 cosmic dust 49 Lunar CRater Observation 49 LISA Pathfinder 49 Huygens probe 49 comets moons 49 Planck telescope 49 constellation Taurus 49 CALIPSO satellites 49 constellation Lacerta 49 astronaut Leopold Eyharts 49 unmanned lunar orbiter 49 Russian Valery Tokarev 49 coronal mass ejection 49 Pirs docking compartment 49 crawler transporter 49 Climate Experiment GRACE 49 microquasar 49 Saturn Enceladus 49 rover Sojourner 49 inner Oort Cloud 49 Glonass navigation satellites 49 ESA Huygens probe 49 LCROSS mission 49 Jean Pierre Lebreton 49 celestial bodies 49 Michibiki 49 comet Lulin 49 fainter objects 49 extravehicular activities 49 cosmonaut Mikhail Tyurin 49 Observatory STEREO 49 ESA Planck 49 asteroid Eros 49 planet magnetosphere 49 Insat 3A 49 distant quasar 49 GEochemistry 49 MG J# +# 49 shuttle astronauts 49 Kepler 9b 49 NASA Voyager spacecraft 49 meteoritic material 49 Saturn rings 49 astrophysical phenomena 49 moons Europa 49 interstellar dust particles 49 Jules Verne ATV 49 CoRoT #b 49 Mars rovers 49 Comet 9P/Tempel 1 49 pressurized compartment 49 Commander Sergei Krikalev 49 ESA GOCE 49 SN #gy 49 engineer Yury Lonchakov 49 astronauts aboard 49 ISS Expedition 49 mesosphere 49 robot rovers 49 Russian Soyuz spacecraft 49 Laser Interferometer Space 49 planet HD#b 49 Pluto Kuiper Belt 49 active galactic nuclei 49 Lyndin 49 rotating neutron stars 49 enters lunar orbit 49 habitable planets 49 deorbited 49 Glonass satellites 49 permanently shadowed craters 49 Kepler Telescope 49 asteroid Lutetia 49 Astronaut Randolph Bresnik 49 radioisotope thermoelectric generator 49 Uranus