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(Click for frequent words.) 71 elliptical orbit 70 highly elliptical orbit 68 polar orbit 67 orbit 67 orbits 66 lunar orbit 64 perigee 64 sun synchronous orbit 64 perihelion 63 circular orbits 63 geostationary orbit 63 orbital inclination 62 elongated orbit 62 geo stationary orbit 62 geosynchronous orbit 61 orbital velocity 60 elliptical orbits 60 Churyumov Gerasimenko 59 aphelion 59 equatorial orbit 59 MESSENGER spacecraft 59 Sun synchronous orbit 58 preset orbit 58 innermost planet 58 suborbital trajectory 58 comet Churyumov Gerasimenko 58 NASA MESSENGER spacecraft 58 prograde 58 Earth orbit 58 slender crescent 57 rotational axis 57 circularize 57 orbital altitude 57 Martian orbit 57 geosynchronous transfer orbit 57 Chang'eI 57 elongated orbits 57 orbital resonance 56 Kepler 9c 56 orbital eccentricity 56 Saturn Cassini 56 celestial equator 56 Comet #P/Churyumov-Gerasimenko 56 Ulysses spacecraft 56 gaseous planet 56 hypersonic speeds 56 retrograde orbit 56 WASP #b 56 closest flyby 56 GEochemistry 56 planet orbits 56 Astronomical Units 56 sunlike star 56 lunar orbits 56 Titan flyby 56 axial tilt 55 PSLV C6 55 probe Chang'e 55 comets orbiting 55 synchronous orbit 55 IBEX spacecraft 55 geo synchronous orbit 55 geo synchronous 55 orbital 55 orbital insertion 55 hydrazine thrusters 55 Space ENvironment GEochemistry 55 geosynchronous 55 New Horizons spacecraft 55 entire Milstar constellation 55 comet #P/Churyumov-Gerasimenko 55 magnetotail 55 drogue parachute 55 geostationary transfer 55 constellation Aquarius 55 Comet Churyumov Gerasimenko 55 Epsilon Eridani 55 MErcury Surface Space ENvironment 55 orbiting 55 perilune 55 Geosynchronous Transfer Orbit GTO 54 Nasa spacecraft 54 km perigee 54 synchronous polar 54 planetary Transits 54 asteroid Vesta 54 orbit GTO 54 apogee farthest point 54 Yarkovsky effect 54 constellation Ursa Major 54 Cancri e 54 planets orbits 54 Saturn outermost moon 54 orbiter Cassini 54 spacecraft Chandrayaan 1 54 highly elliptical orbits 54 Messenger spacecraft 54 spacecraft 54 Ranging spacecraft 54 orbit GEO 54 tidally locked 54 Earth radii 54 BepiColombo 54 HD#b 53 Earth gravitational pull 53 Galileo spacecraft 53 Earth asteroid Itokawa 53 asteroid Itokawa 53 orbital rendezvous 53 SIRTF 53 Shepherding Spacecraft 53 geo synchronous transfer 53 ecliptic plane 53 waning gibbous 53 COROT 53 NFIRE satellite 53 Mpc 53 impactor spacecraft 53 Jupiter Ganymede 53 lander rover 53 RL# engine 53 Foton spacecraft 53 SBSS satellite 53 #P/Churyumov-Gerasimenko 53 waxing crescent 53 ballistic trajectory 53 shepherding spacecraft 53 Zeta Ophiuchi 53 Beta Pictoris b 53 asteroid Steins 53 Stardust spacecraft 53 arcminutes 53 ion propulsion 53 polar orbits 53 Convection Rotation 53 HD #b [001] 53 Skynet 5C 53 GJ#b 53 spacecraft Cassini 53 Kuiper Belt object 52 ESA Huygens probe 52 electric ion propulsion 52 gravitational slingshot 52 GeV 52 geosynchronous transfer 52 red supergiant 52 Comet Hartley 2 52 Fregat upper stage 52 NASA Stardust spacecraft 52 eccentric orbits 52 arcseconds 52 PSLV C 52 Geosynchronous orbit 52 comet nucleus 52 perigee closest 52 Lunar Reconnaissance Orbiter LRO 52 planets Uranus 52 orbit insertion 52 geostationary orbits 52 Rosetta orbiter 52 Orbiter MRO 52 thrusters 52 orbited 52 occultations 52 Itokawa 52 Fomalhaut b 52 spacecraft orbited 52 mesosphere 52 ecliptic 52 pericentre 52 maneuvering thrusters 52 GOCE 52 thin crescent 52 Deep Impact craft 52 shuttlecock shaped capsule 52 flyby spacecraft 52 Upsilon Andromedae 52 impactor 52 Impact Probe MIP 52 Pleiades star 52 mu Arae 52 KAGUYA 52 Comet Lulin 52 lunar equator 52 HD #b [002] 52 galactic disk 52 Yinghuo 1 51 jovian 51 waxing gibbous 51 solar radii 51 BLG #Lb 51 stationary lander 51 arcsecond 51 PSLV C# rocket 51 GQ Lupi 51 constellation Hercules 51 Orbiter LRO 51 ion thrusters 51 supergiant star 51 heliopause 51 WISE spacecraft 51 waxing gibbous moon 51 reentry capsule 51 comet chaser 51 elliptical polar 51 Shackleton crater 51 GJ #b [002] 51 exosphere 51 celestial sphere 51 Proxima Centauri 51 SIM PlanetQuest 51 Curiosity rover 51 Jules Verne ATV 51 PSLV C# 51 LRO spacecraft 51 CoRoT #b 51 entered lunar orbit 51 rocket thrusters 51 tidal bulge 51 arcsec 51 Capricornus 51 Plesetsk Cosmodrome 51 constellation Andromeda 51 Cassini Huygens spacecraft 51 orbits Saturn 51 sodium atoms 51 retrorockets 51 Toutatis 51 RX J# 51 retroreflector 51 INSAT 4CR 51 lunar perigee 51 PSLV C9 50 Arabsat 5A 50 airglow 50 SpaceShip Two 50 MESSENGER MErcury Surface 50 CoRoT 7b 50 Kepler spacecraft 50 thruster rockets 50 spaceward 50 gravitational keyhole 50 Pegasus XL 50 copper impactor 50 Corot 9b 50 Ringed Planet 50 Cassini spacecraft orbiting 50 Gliese #e 50 Eta Carinae 50 navigate autonomously 50 Huygens lander 50 Sojourner rover 50 Philae lander 50 Cassini Huygens 50 Solar TErrestrial RElations Observatory 50 Comet Hartley 50 aerobraking 50 geosynchronous orbits 50 Cloud Aerosol Lidar 50 celestial object 50 Astra 1L 50 martian atmosphere 50 protoplanets 50 star Spica 50 Rosetta spacecraft 50 ROCSAT 2 50 lunar orbit insertion 50 ringed planet 50 exoatmospheric kill vehicle 50 KBOs 50 probe Huygens 50 galactic equator 50 moonlet 50 lunar module Eagle 50 heliosheath 50 gravitational interaction 50 Crewmate Tracy Caldwell 50 Cassini flyby 50 JCSAT 9 50 orbiter lander 50 transiting planet 50 Venusian surface 50 constellation Monoceros 50 GOCE satellite 50 CoRoT satellite 50 Compton Gamma Ray 50 Sedna 50 PSLV rocket 50 APXS 50 constellation Virgo 50 lunar spacecraft Chandrayaan 50 radial velocity 50 LightSail 50 Cassini orbiter 50 payload fairing 50 Tempel Tuttle 50 Shenzhou V 50 exoplanetary 50 giant elliptical galaxy 50 Helios 2B 50 stellar occultations 50 lunar orbiter Chandrayaan 50 HAT P 50 umbral shadow 50 Carina constellation 49 AU Mic 49 robotic spacecraft 49 geosynchronous satellite 49 six wheeled rover 49 lunar surface 49 Lunokhod 49 enters lunar orbit 49 scramjet engine 49 HM Cancri 49 gamma ray observatory 49 crewed spacecraft 49 interstellar space 49 NFIRE 49 Flyby spacecraft 49 galaxy M# [001] 49 luminous galaxies 49 HL Tau 49 Voyager spacecraft 49 planet Uranus 49 Gliese #c 49 protoplanet 49 Giove B 49 S/# P2 49 Mars Odyssey spacecraft 49 Soyuz landings 49 deorbit burn 49 MESSENGER 49 Hubble orbits 49 Saturnian 49 Insat 3A 49 Odyssey orbiter 49 comet Hartley 2 49 MetOp 49 Relations Observatory STEREO 49 Pluto Charon 49 BLG #L 49 P Churyumov Gerasimenko 49 perigee nearest point 49 Jovian moons 49 Saturnian moon 49 interstellar particles 49 starburst galaxy 49 constellation Centaurus 49 Skynet 5B 49 millisecond pulsar 49 constellation Leo 49 ASTRA 1KR 49 Epsilon Aurigae 49 cosmological distances 49 NROL 49 Planetary Transits 49 substorm 49 deorbit 49 protoplanetary disk 49 LISA Pathfinder 49 Jupiter Saturn 49 galactic halo 49 Saturnian system 49 Muchachos Observatory 49 parabolic trajectory 49 outer planets 49 Isidis Planitia 49 wheeled rover 49 sextile 49 swingby 49 Shenzhou VI capsule 49 PSR J# 49 Uranus Jupiter 49 ASTRA 1G 49 exoplanets planets 49 twin rover Opportunity 49 NASA MErcury Surface 49 STSS Demo 49 star IM Pegasi 49 Mars Reconnaissance Orbiter MRO 49 ESA SMART 49 spinning gyroscopes 49 magnetopause 49 PSLV C8 49 intrinsic brightness 48 lander 48 SOHO spacecraft 48 ST5 48 equatorial bulge 48 xenon propellant 48 photometry 48 Epoxi 48 Infrared Pathfinder Satellite 48 Zenit 3SL rocket 48 thruster firings 48 ion thruster 48 magnetar 48 velocity vector 48 Resourcesat 2 48 constellation Pegasus 48 constellation Cassiopeia 48 waning crescent 48 ultraviolet spectrograph 48 Galileo satellites 48 constellation Scorpius 48 ESO VLT 48 outermost planet 48 asteroids Ceres 48 OSIRIS REx 48 lunar probe Chang'e 48 gradiometer 48 Oort cloud 48 JIMO 48 orbital radius 48 NextSat 48 twin Voyager spacecraft 48 WISE mapped 48 optical wavelengths 48 Shenzhou V spacecraft 48 Soyuz FG 48 Kuiper belt object 48 millisecond pulsars 48 orbiting telescope 48 Kuiper belt objects 48 EPOXI spacecraft 48 Cepheus 48 Comet Halley 48 Phobos Grunt 48 Earth magnetosphere 48 orbiting planets 48 Delta Cephei 48 X ray pulses 48 constellation Cepheus 48 THEMIS satellites 48 sidereal 48 Mars Pathfinder lander 48 gibbous moon 48 reboost 48 distant galaxy 48 orbited Jupiter 48 Michibiki 48 Cassini 48 INSAT 3A 48 Voyager probes 48 retrograde orbits 48 Huygens 48 Martian atmosphere 48 periodic dimming 48 Optical Spectroscopic 48 volcanic moon Io 48 ASTRA 3B 48 GALEX 48 # Apophis 48 Endeavour STS 48 sunward 48 parsecs 48 Betelgeuse 48 flyby 48 Corot 7b 48 manned spacecraft Shenzhou VI 48 reflection nebula 48 Earth magnetotail 48 gravitational wobbles 48 Puppis 48 sized planets orbiting 48 frozen sunless 48 Venusian atmosphere 48 coronagraph 48 microquasar 48 SES Americom AMC 48 NASA Orbiting Carbon 48 antineutrinos 48 Pegasi 48 GSAT 5P 48 Cepheid variable 48 equator 48 gravitationally 48 Comet Tempel 1 48 GSLV D3 48 Cassini spacecraft 48 icy moons 48 spacecraft flyby 48 Foton M3 48 interstellar dust grains 48 AB Aurigae 48 circumstellar disk 48 MUSES C 48 elliptical galaxy 48 CoRoT 48 heliosphere 48 Fregat 48 photometer 48 unpowered glider 48 Mercury Uranus 47 STEREO spacecraft 47 geo stationary 47 constellation Taurus 47 constellation Cetus 47 Kuiper Belt Object 47 Uranus 47 spacecraft thrusters 47 Orionids 47 Comet 9P/Tempel 1 47 Cepheids 47 comet orbit 47 spacecraft orbiting 47 VLTI 47 Kepler Telescope 47 constellation Sagittarius 47 AGNs 47 Centaur rocket 47 Centaur upper 47 occultation 47 GSLV Mk III 47 photosphere 47 Hipparcos 47 Crawler Transporter 47 LCROSS spacecraft 47 probe Akatsuki 47 Atlas IIAS 47 UDFy # 47 Earth rotational axis 47 Eta Aquarid meteor shower 47 Comet Holmes 47 star Gliese 47 Rockot launcher 47 detect gravitational waves 47 Lagrangian 47 Flyby 47 planemos 47 Kaguya 47 aboard Taurus XL 47 obliquity 47 annularity 47 ultraviolet imaging spectrograph 47 GOES O 47 manned Shenzhou 47 Tanegashima Space Center 47 constellation Eridanus 47 substorms 47 Ultraviolet Imaging Spectrograph UVIS 47 gravitationally bound 47 Jupiter Uranus 47 XO 3b 47 equinoxes 47 AUs 47 Rockot 47 #kt #km h 47 accretion disk 47 THEMIS spacecraft 47 aeroshell 47 protostar 47 Hyakutake 47 Galilean moons 47 spacecrafts 47 irregularly shaped asteroid 47 thin crescent moon 47 Circinus X 1 47 Kazakhstan barren steppe 47 #:# GMT 47 gamma ray flares 47 ESA Huygens 47 asteroid Lutetia 47 TrES 47 Proton Breeze M 47 Lunar Orbit 47 constellations Cygnus 47 rover Spirit landed 47 Shenzhou capsule 47 orbiting spacecraft 47 Orbiting 47 comet Tempel Tuttle 47 ATV Johannes Kepler 47 Saturn moons Titan 47 YU# 47 Doppler measurements 47 MG J# +# 47 Stardust capsule 47 INSAT 4B 47 Virgo Cluster 47 ray Space Telescope 47 redshifted 47 moons Phobos 47 helium atoms 47 lunar orbiter Chang'e 47 constellation Auriga 47 Kazakhstan Baikonur Cosmodrome 47 2F rocket 47 SMOS 47 geyser plumes 47 OGLE TR #b 47 LAGEOS 47 GA6 47 brown dwarf 47 kg payload 47 unmanned spacecraft 47 WMAP satellite 47 Mauna Kea Hawaii 47 Tauri Sb 47 GJ #b [001] 47 gravitational tugs 47 occulted 47 penumbral shadow 47 Shenzhou spacecraft 47 Cartosat 2A 47 functioning gyroscopes 47 radial velocity method 47 eclipsing binary 47 Mössbauer 47 NASA Kepler telescope 47 ultraviolet wavelengths 47 Discovery undocked 47 transiting exoplanet 47 YORP effect 47 Saturn Uranus 47 Lt. Col. Yang Liwei 47 particle beam 47 Venus Climate Orbiter 47 LORRI 47 zodiacal light 47 Taurus XL 47 Hayabusa probe 47 particle detector 47 inhabitable planets 47 barred spiral galaxy 47 submillimeter wavelengths 47 planet WASP #b 47 gibbous 47 Comet Boethin 47 GIOVE B 47 albedo reflectivity 47 interplanetary spacecraft 47 gamma ray spectrometer 47 radio occultation 47 visible wavelengths 47 ESA Rosetta 47 Lunar Orbiter Laser Altimeter 47 ionized gas 47 Upsilon Andromedae b 47 Beta Pictoris 47 Plutoids 47 Endeavour Crater 47 Soyuz launcher 47 Steins asteroid 46 magma ocean 46 spiral galaxy 46 Proba 2 46 RQ# 46 Venusian 46 thrilling stargazers 46 orbital slot 46 globular cluster 46 parsec 46 C1XS 46 Soyuz Fregat 46 Pluto Eris 46 Eridani 46 proto planetary disk 46 Lyra constellations 46 Glonass K 46 Martian equator 46 magnetic dynamo 46 GRACE satellites 46 Encke gap 46 Kepler telescope 46 CALIPSO 46 asteroid Eros 46 GOSAT 46 IKAROS 46 orbiter 46 HAMSAT 46 geosynchronous satellites 46 BP Piscium 46 Kounotori2 46 Solar Orbiter 46 magnetosphere 46 Jupiter moons 46 Planck 46 umbral 46 Jupiter flyby 46 Pirs docking compartment 46 Mars Opportunity rover 46 Vehicle PSLV 46 asteroid belt 46 GSLV rocket 46 planetary transits 46 Solar Dynamics Observatory 46 Russian cosmonaut Alexander Kaleri 46 Comet Machholz 46 NASA twin rovers 46 Globalstar satellites 46 Wilkinson Microwave Probe 46 unstowed 46 DIRECTV 9S 46 thruster 46 neutron spectrometer 46 renamed GOES 46 galaxy redshift 46 submillimetre wavelengths 46 moon Io 46 carry heavier payloads 46 DART spacecraft 46 Earth axial tilt 46 galaxy NGC 46 rover Spirit 46 planetary orbits 46 RISAT 46 ASTRA 1L 46 ramjet 46 unmanned lunar orbiter 46 Saturnian moons 46 gravitational acceleration 46 umbra 46 Huygens mission 46 Triangulum 46 Plesetsk 46 circumlunar 46 Herschel telescope 46 Insat 4A 46 luminosities 46 PSLV C7 46 Laboratory MSL 46 lander Philae 46 comet Wild 46 Crab Nebula 46 Beehive Cluster 46 dipole moment 46 breathing scramjet engine 46 radians 46 planet Gliese #c 46 JCSAT 46 Geosynchronous Transfer Orbit 46 observable universe 46 SpaceLoft XL 46 obscuration 46 ejecta 46 Dragon capsule 46 tropopause 46 Kibo robotic arm 46 indigenous cryogenic engine 46 TrES 4 46 Kwangmyongsong 46 Saturn moon Mimas 46 Planck spacecraft 46 Launch Pad #B 46 Divine Vessel 46 Anik F3 46 ellipse 46 infrared wavelengths 46 satellites orbiting Earth 46 fairing separation 46 infrared observatory 46 planet Gliese #g 46 robotic explorer 46 constellation Cygnus 46 starlike object 46 moons Europa 46 Bug Nebula 46 robotic rover 46 Kuiper Belt objects 46 nebular 46 Lunar CRater Observation 46 velocity dispersion 46 Horizons spacecraft 46 geosynchronous Earth 46 GPS 2R 46 Ocean Salinity SMOS 46 crescent Moon 46 metallicity 46 VY Canis Majoris 46 Meridiani plains 46 rotational velocity 46 unmanned Chandrayaan 46 infrared telescope 46 ionosphere 46 Glonass satellites 46 Quadrantid meteor shower 46 Saturn magnetosphere 46 Vehicle PSLV C# 46 Gravity Probe 46 constellation Aries 46 filamentary structure 46 geo stationary satellites 46 Chang'e 46 Huygens probe 46 XTE J# 46 Apophis asteroid 46 largest moon Charon 46 solar corona 46 planets 46 Manned missions 46 X ray binary 46 fainter objects 46 TU# [002] 46 star Proxima Centauri 46 Interior Laboratory GRAIL 46 Undocking 46 GLAST telescope 46 orbiting Saturn 46 Spacewalkers Scott Parazynski 46 mooncraft 46 sols 46 X ray observatory 46 supernova explosion 46 Hale Bopp 46 rotates clockwise 46 Atlantis undocks 46 C NOFS 46 Mars Uranus 46 robotic lander 46 Earth orbit LEO 46 J# +# [002] 46 heavily cratered 46 moon Titan 46 Opportunity rover 46 orbiting observatory 46 Spectrograph 46 silicate dust 46 flyby Cassini 46 NASA Cassini spacecraft 46 galaxy M# [002] 45 Ring Nebula 45 sun corona 45 #C #F [003] 45 GSLV rockets 45 Titan flybys 45 Taurus XL rocket 45 thermodynamic equilibrium 45 Milstar II 45 Hayabusa spacecraft 45 laser altimeter 45 meter diametre 45 unpowered 45 Huygens Probe 45 Akatsuki engines 45 linearly polarized 45 GRBs 45 Orionid meteors 45 deorbiting 45 Kiruna Sweden 45 Evolution Explorer 45 Kuiper Belt Objects 45 O OREOS 45 Lutetia 45 Lyndin 45 Viking Lander 45 -# degrees Fahrenheit [002] 45 MetOp satellite 45 comet flyby 45 unmanned lunar 45 TanDEM X 45 Deep Impact eXtended Investigation 45 KSLV 1 45 P/# A2 45 orbiter Mars Odyssey 45 SMOS mission 45 Jupiter magnetosphere 45 polar vortex 45 Kepler #b 45 asteroid flyby 45 exo planets 45 ejecta blanket 45 Diviner 45 Martian surface 45 Pleiades cluster 45 LCROSS Lunar Crater Observation 45 Cosmodrome 45 Stardust mothership 45 Shenzhou VI spacecraft 45 neutral mass spectrometer 45 SNe Ia 45 Pirs Docking Compartment 45 XMM Newton 45 geostationary earth 45 constellation Perseus 45 comet Tempel 1 45 Solid Rocket Boosters 45 Briz M booster 45 brightnesses 45 Europa Orbiter 45 Aurigae 45 subsurface ocean 45 EPOCh 45 Solar Terrestrial Relations 45 Geminga 45 dwarf spheroidal 45 penumbral eclipse 45 moon Ganymede 45 solar nebula 45 HIRES spectrometer 45 Chandrayaan 45 Wolf Rayet star 45 SN #A 45 Mercury flyby 45 telescope Uranus 45 gamma ray emission 45 Rosette Nebula 45 Cosmonaut Yuri Gagarin 45 energetic electrons 45 INSAT 4A 45 concentrating photovoltaics CPV 45 INSAT 3E 45 aboard Soyuz TMA 45 asterism 45 Minotaur rocket 45 X ray telescopes 45 Sensing Satellite 45 Beidou satellite 45 constellation Gemini 45 La Silla Chile 45 Optus D3 45 spiral galaxy Messier 45 starburst galaxies 45 Explorer GALEX 45 Shenzhou VII 45 planetoid 45 VIRTIS 45 propellant loading 45 Geo IK 45 smallest exoplanet 45 dwarf galaxy 45 Itokawa asteroid 45 moons orbiting 45 Fornax cluster 45 celestial objects 45 cometary impacts 45 taikonaut 45 geostationary satellite 45 exosolar planets 45 Breeze KM 45 Observatory SDO 45 lunar spacecraft 45 Plesetsk cosmodrome 45 SAR Lupe 45 WISE telescope 45 exoplanets orbiting 45 constellation Libra 45 Kosmos 3M rocket 45 NanoSail D 45 trine 45 infrared wavelength 45 backshell 45 W3B 45 robotic rovers 45 GRB# 45 orbital module 45 SSMEs 45 Mars moon Phobos 45 orbiting Hubble Space Telescope 45 GRB #B 45 Vinasat 45 Cabeus crater 45 GPS IIR M 45 Insat 4CR 45 HARPS spectrograph attached 45 Zvezda module 45 planet HD #b 45 Foton M2 45 Rockot launch 45 shuttle Discovery blasted 45 unmanned Shenzhou 45 Thermal Emission Spectrometer 45 Sriharikota spaceport 45 Hubble Space telescope 45 Global Surveyor 45 ENAs 45 supersonic combustion ramjet 45 EchoStar XV 45 Comet NEAT 45 entitled Kavoshgar 45 constellation Carina 45 station Pirs docking 45 antiproton 45 RY Sagittarii 45 gaseous planets 45 NEOSSat 45 -# Celsius [001] 45 Cygnus Lyra region 45 radial velocities 45 gamma ray burst 45 millimeter wavelength 45 deg 45 Arches Cluster 45 cesium atom 45 constellation Ara 45 polar orbiting 45 mere fly bys 45 comet orbital 45 zodiacal constellations 45 outermost planets 45 Deep Impact probe 45 fist widths 45 lunar landers 45 unmanned rover 45 milliarcseconds 45 Cancri 45 Algol 45 trans Neptunian objects 45 SpaceLoft XL rocket