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(Click for frequent words.) 71 circular orbit 70 highly elliptical orbit 69 orbits 67 elongated orbit 66 orbit 65 perigee 64 polar orbit 63 elliptical orbits 63 perihelion 61 aphelion 60 innermost planet 60 lunar orbit 59 gaseous planet 58 circular orbits 58 orbital inclination 58 orbital velocity 58 Churyumov Gerasimenko 58 Earth orbit 57 geosynchronous orbit 57 Epsilon Eridani 57 planets orbits 57 orbiting 57 synchronous orbit 57 sun synchronous orbit 56 planet orbits 56 eccentric orbits 56 ringed planet 56 hypersonic speeds 56 Yarkovsky effect 55 axial tilt 55 Ranging spacecraft 55 geostationary orbit 55 elongated orbits 55 gravitational slingshot 55 prograde 55 celestial equator 55 slender crescent 55 rotational axis 55 magnetotail 54 Kepler 9c 54 GeV 54 WASP #b 54 CoRoT #b 54 Kuiper belt object 54 apogee farthest point 54 Space ENvironment GEochemistry 54 Galileo spacecraft 54 orbital eccentricity 54 constellation Ursa Major 54 equatorial orbit 54 ecliptic plane 54 spacecraft 54 retrograde orbit 54 circularize 54 Messenger spacecraft 54 geo stationary orbit 53 galactic disk 53 Comet #P/Churyumov-Gerasimenko 53 GEochemistry 53 MESSENGER spacecraft 53 frozen sunless 53 gravitational interaction 53 #P/Churyumov-Gerasimenko 53 Kuiper Belt object 53 orbiting telescope 53 asteroid Vesta 53 HD#b 53 orbital altitude 53 celestial sphere 53 constellation Hercules 53 Comet Churyumov Gerasimenko 53 supergiant star 53 MESSENGER MErcury Surface 53 orbital resonance 53 red supergiant 53 planet Uranus 53 tidally locked 53 Earth gravitational pull 53 thin crescent moon 52 ecliptic 52 constellation Aquarius 52 arcseconds 52 comets orbiting 52 closest flyby 52 arcsecond 52 GJ #b [002] 52 planetary Transits 52 NASA MESSENGER spacecraft 52 orbit GEO 52 Earth radii 52 galaxy M# [001] 52 exosphere 52 Martian orbit 52 orbital 52 jovian 52 asteroid belt 52 Epsilon Aurigae 52 Nasa spacecraft 52 arcminutes 51 electric ion propulsion 51 HL Tau 51 Chang'eI 51 Sun synchronous orbit 51 probe Akatsuki 51 Cassini 51 asteroid 51 Ringed Planet 51 magnetar 51 Ulysses spacecraft 51 constellation Pegasus 51 HD #b [001] 51 Gliese #e 51 distant galaxy 51 millisecond pulsar 51 heliosphere 51 BepiColombo 51 lunar perigee 51 Pleiades star 51 Saturn outermost moon 51 Cassini Huygens spacecraft 51 lunar orbits 51 sodium atoms 51 comet #P/Churyumov-Gerasimenko 51 Saturn Cassini 51 detect gravitational waves 51 occultations 51 radial velocity 51 planets 51 NASA MErcury Surface 51 Comet Lulin 51 constellation Taurus 51 constellation Libra 51 MErcury Surface Space ENvironment 51 planets Uranus 50 ion propulsion 50 ion thruster 50 pericentre 50 ionosphere 50 Antennae Galaxies 50 Orionids 50 sidereal 50 foreground galaxy 50 Sedna 50 elliptical galaxy 50 New Horizons spacecraft 50 galaxy cluster 50 Upsilon Andromedae 50 protoplanetary disk 50 orbital radius 50 HD #b [002] 50 photosphere 50 asteroid Itokawa 50 gravitational attraction 50 COROT 50 Astronomical Units 50 geostationary orbits 50 orbits Saturn 50 km perigee 50 comet Churyumov Gerasimenko 50 outer planets 50 spacecraft Cassini 50 perilune 50 Jupiter Ganymede 50 X ray binary 50 Fomalhaut b 50 constellation Virgo 50 Saturnian moon 50 Titan flyby 50 constellation Sagittarius 50 orbited Jupiter 50 waxing gibbous moon 50 orbited 50 SIRTF 50 protostar 50 moonlet 50 celestial object 50 solar radii 50 IBEX spacecraft 50 equatorial bulge 50 elliptical polar 50 Voyager spacecraft 50 tidal bulge 50 perigee closest 49 XMM Newton 49 Zeta Ophiuchi 49 accretion disk 49 geo synchronous orbit 49 Pluto Charon 49 Comet Hartley 2 49 flyby spacecraft 49 NFIRE satellite 49 Carina constellation 49 Mpc 49 infrared wavelengths 49 preset orbit 49 CoRoT 7b 49 Pegasi 49 WMAP satellite 49 magnetic dynamo 49 starburst galaxy 49 planetoid 49 Kuiper belt 49 brown dwarf 49 Venusian atmosphere 49 NASA Stardust spacecraft 49 star Proxima Centauri 49 Beta Pictoris b 49 heliosheath 49 Bug Nebula 49 impactor spacecraft 49 Galilean moons 49 Martian atmosphere 49 Saturnian 49 orbital rendezvous 49 largest moon Charon 49 probe Chang'e 49 mesosphere 49 stellar occultations 49 protoplanet 49 HAT P 49 KBOs 49 heliopause 49 orbiter 49 Uranus 49 Yinghuo 1 49 SIM PlanetQuest 48 Kuiper Belt Object 48 Capricornus 48 NASA Cassini spacecraft 48 Geosynchronous orbit 48 orbital insertion 48 Compton Gamma Ray 48 Rosetta spacecraft 48 filamentary structure 48 Eta Carinae 48 Toutatis 48 Rosetta orbiter 48 Skynet 5C 48 Itokawa 48 GJ#b 48 Beta Pictoris 48 constellation Perseus 48 Lyra constellations 48 geo synchronous transfer 48 sextile 48 outermost planet 48 YU# 48 solar corona 48 volcanic moon Io 48 highly elliptical orbits 48 waning gibbous 48 BLG #Lb 48 Earth asteroid Itokawa 48 troposphere 48 Comet Holmes 48 constellation Cassiopeia 48 Saturn rings 48 suborbital trajectory 48 BLG #L 48 comet orbit 48 Triangulum 48 spiral galaxy 48 orbit GTO 48 entered lunar orbit 48 icy moons 48 SOHO spacecraft 48 gravitational keyhole 48 Jupiter Uranus 48 moons orbiting 48 constellation Scorpius 48 radial velocities 48 crescent Moon 48 Cassini Huygens 48 Oort Cloud 48 moon Io 48 mu Arae 48 zodiacal light 48 AU Mic 48 Proxima Centauri 48 Earth rotational axis 48 polar orbits 48 exoplanetary 48 planetary orbits 48 substorms 48 celestial bodies 48 Swift Tuttle 48 ion thrusters 48 comet nucleus 48 Deep Impact craft 48 gravitationally bound 48 orbiter Cassini 48 imaging spectrometer 48 transiting exoplanet 48 twin Voyager spacecraft 48 accretion disks 48 Jovian moons 48 ballistic trajectory 48 supernova explosion 48 star Gliese 48 Relations Observatory STEREO 48 geo synchronous 48 arcsec 48 eclipsing binary 48 circumstellar disk 48 Uranus Jupiter 48 Corot 9b 48 interstellar space 48 gravitational pull 48 Oort cloud 48 waxing crescent 48 Saturn magnetosphere 47 umbra 47 Kepler Telescope 47 observable universe 47 Corot 7b 47 sunlike star 47 Upsilon Andromedae b 47 impactor 47 star Fomalhaut 47 waning crescent Moon 47 infrared telescope 47 Shenzhou VI capsule 47 occultation 47 Kepler spacecraft 47 CoRoT satellite 47 Michibiki 47 APXS 47 Steins asteroid 47 thin crescent 47 star Spica 47 Wolf Rayet star 47 constellation Leo 47 Saturnian system 47 Arches Cluster 47 oblique angle 47 geostationary transfer 47 X ray observatory 47 WISE spacecraft 47 unmanned spacecraft 47 Optical Spectroscopic 47 Virgo cluster 47 Cancri e 47 equator 47 moons Europa 47 Stardust spacecraft 47 VY Canis Majoris 47 Kuiper Belt objects 47 gamma ray observatory 47 Haumea 47 radial velocity method 47 penumbral shadow 47 galactic cosmic rays 47 robotic spacecraft 47 Virgo Cluster 47 Kepler #b 47 Lagrangian 47 Solar TErrestrial RElations Observatory 47 Fornax cluster 47 RX J# 47 globular cluster 47 Convection Rotation 47 irregularly shaped asteroid 47 waxing crescent moon 47 constellation Andromeda 47 thrusters 47 PSLV C# rocket 47 Pluto Eris 47 moon Ganymede 47 ellipse 47 AGNs 47 Venus Climate Orbiter 47 gravitational pulls 47 asteroid Lutetia 47 GALEX 47 equinox 47 spacecraft Chandrayaan 1 47 gravitational interactions 47 Gliese #c 47 intrinsic brightness 47 orbiter lander 47 Comet Hartley 47 retrograde orbits 47 PSLV C6 47 comet 47 TrES 47 spacecraft flyby 47 sunspot cycle 47 Cassini orbiter 47 stellar occultation 47 microlensing 47 moon Charon 47 geosynchronous 47 asteroid Steins 47 millisecond pulsars 47 subatomic particle 47 orbiting Hubble Space Telescope 47 protoplanets 47 oblate spheroid 47 exoplanets planets 47 Andromeda galaxy 47 Kuiper belt objects 47 Earth axial tilt 47 aerobraking 47 parabolic trajectory 47 retroreflector 46 magnetosphere 46 transiting planet 46 interplanetary spacecraft 46 constellation Cepheus 46 active galactic nuclei 46 Mars Odyssey spacecraft 46 moon Enceladus 46 visible wavelengths 46 MESSENGER 46 Earth magnetotail 46 submillimeter wavelengths 46 angular momentum 46 proto planetary disk 46 redshifts 46 GQ Lupi 46 comets asteroids 46 exoplanet 46 interstellar particles 46 entire Milstar constellation 46 Saturn Uranus 46 Jupiter Saturn Uranus 46 TU# [002] 46 SMOS mission 46 spherical shape 46 interferometers 46 waning crescent 46 comet Tempel Tuttle 46 obliquity 46 galaxy NGC 46 planet magnetosphere 46 lander rover 46 Cassini spacecraft 46 ESA Huygens probe 46 equinoxes 46 planetary nebula 46 STEREO spacecraft 46 Orbiting 46 exoplanet orbiting 46 SGR J# 46 attosecond 46 nebula 46 cosmic ray 46 Andromeda Galaxy 46 asterism 46 gravitational acceleration 46 smoothed sunspot number 46 probe Huygens 46 field Infrared Survey 46 quasar 46 constellation Monoceros 46 Hubble Constant 46 Comet Machholz 46 Earth magnetosphere 46 Halley comet 46 galaxy 46 Methone 46 GOCE 46 geosynchronous transfer 46 Cancri 46 rocket thrusters 46 electron volts 46 Milky Way galaxy 46 fainter objects 46 TrES 4 46 periodic dimming 46 martian atmosphere 46 redshift 46 orbit insertion 46 brown dwarfs 46 infrared observatory 46 geosynchronous orbits 46 CoRoT 46 constellation Centaurus 46 planet WASP #b 46 optical wavelengths 46 Venusian surface 46 Saturn moon Mimas 46 geosynchronous satellites 46 synchronous polar 46 Solar Orbiter 46 Encke gap 46 exoplanets orbiting 46 Iapetus 46 redshifted 46 gibbous 46 outermost planets 46 quasars 46 solar eclipse occurs 46 Jupiter Saturn 46 distant galaxies 46 extrasolar 46 planemos 46 MUSES C 46 geosynchronous transfer orbit 46 INSAT 4CR 46 PSR J# 46 airglow 46 gamma ray burst 46 Geminga 46 Orbiter MRO 46 cosmic cannibal 46 magnetic polarity 46 comet chaser 46 giant elliptical galaxy 46 ultraviolet wavelengths 46 elliptical galaxy NGC 46 KAGUYA 46 ESA SMART 46 Quadrantid meteor shower 46 galaxy M# [002] 46 magma ocean 46 sunspot activity 46 S/# P2 46 macroscopic objects 46 Near Infrared Camera 45 galactic equator 45 shuttlecock shaped capsule 45 HD# [002] 45 WFC3 45 fiery reentry 45 Europa Orbiter 45 AB Aurigae 45 Fregat upper stage 45 # Apophis 45 LORRI 45 distant quasar 45 Pleiades 45 Betelgeuse 45 xenon propellant 45 constellation Gemini 45 NROL 45 super Earths 45 Infrared Pathfinder Satellite 45 Cepheids 45 cosmological distances 45 YORP effect 45 Uranian 45 Explorer WISE 45 Tempel Tuttle 45 HIRES spectrometer 45 INSAT 3D 45 luminous galaxies 45 geostationary 45 cosmic ray protons 45 Jupiter magnetosphere 45 Hubble telescope 45 Apophis 45 Herschel Space 45 X ray telescopes 45 magnetic fields 45 pulsar 45 protons 45 blazar 45 particle beam 45 moons Phobos 45 galaxies 45 Comet Halley 45 robotic rovers 45 Japan Hayabusa spacecraft 45 microquasar 45 Large Magellanic Cloud 45 Comet Tempel 1 45 constellation Cygnus 45 Mars Uranus 45 spacecraft orbiting 45 constellation Aries 45 extragalactic planet within 45 Cassini flyby 45 Impact Probe MIP 45 Fomalhaut 45 Hyakutake 45 resonance frequency 45 trans Neptunian objects 45 VHE gamma rays 45 orbiting satellites 45 Cassini spacecraft orbiting 45 RY Sagittarii 45 copper impactor 45 unpowered glider 45 orbiting observatory 45 ESA comet chaser 45 solar nebula 45 drogue parachute 45 exoplanets 45 Lunar Reconnaissance Orbiter LRO 45 sunspots 45 occulted 45 Orionid 45 LAGEOS 45 Fermi telescope 45 interstellar dust 45 Orion Nebula 45 asteroids 45 Saturnian moons 45 NASA Voyager spacecraft 45 spiral galaxy NGC 45 ENAs 45 gamma ray flares 45 gravitational tugs 45 ultraluminous galaxy 45 extrasolar planet 45 faraway galaxies 45 X ray afterglow 45 Kuiper Belt Objects 45 emit X rays 45 microlensing events 45 Geosynchronous Transfer Orbit GTO 45 GJ #b [001] 45 dwarf galaxy 45 gravitational tug 45 umbral shadow 45 constellation Carina 45 Tauri Sb 45 asteroids Ceres 45 sized planets orbiting 45 femtoseconds 45 ray Space Telescope 45 Express orbiter 45 Gravitational lensing 45 albedo reflectivity 45 cometary debris 45 infrared wavelength 45 hydrazine thrusters 45 constellation Piscis Austrinus 45 reentry capsule 45 GZK cutoff 45 extrasolar planets 45 reflection nebula 45 substorm 45 planet HD #b 45 Milky Way Galaxy 45 coronal holes 45 NGC #A 45 precessing 45 baryon 45 P/# A2 45 heliospheric 45 Perseus cluster 45 Delta Cephei 45 terrestrial planets 45 inhabitable planets 45 retrorockets 45 ejecta blanket 45 Crab pulsar 45 smallest exoplanet 45 Voyager probes 45 Jupiter Icy Moons 45 RL# engine 45 planet orbiting 44 gravitational lens 44 subsurface ocean 44 magnetopause 44 Martian moons Phobos 44 PSLV rocket 44 Solar System 44 Kepler telescope 44 HiRISE camera aboard 44 blue supergiant 44 radio occultation 44 magnetars 44 lunar equator 44 Mandushev 44 orbiting observatories 44 shorter wavelengths 44 electron ion 44 -# degrees Celsius [001] 44 Gravitational waves 44 Iridium satellites 44 geostationary satellite 44 photometer 44 proto cluster 44 elliptical galaxies 44 deformable mirror 44 gaseous planets 44 Hayabusa spacecraft 44 comet Wild 44 Evolution Explorer 44 Herschel Space Telescope 44 reionization 44 Global Surveyor 44 Mimas 44 moons orbiting Saturn 44 waxing gibbous 44 INSAT 4B 44 aperture telescope 44 geomagnetic field 44 Beehive Cluster 44 BP Piscium 44 airborne observatory 44 Observatory STEREO 44 exosolar planets 44 Hayabusa 44 Phobos Grunt 44 Huygens lander 44 astrometry 44 WISE mapped 44 maneuvering thrusters 44 gravitational 44 electron density 44 lunar probe Chang'e 44 OSIRIS REx 44 submillimetre wavelengths 44 Gemini constellation 44 comet hurtling 44 spacecrafts 44 HM Cancri 44 NASA Kepler telescope 44 Crab Nebula 44 adaptive optics 44 quantum superposition 44 Plutoids 44 coronal loops 44 XTE J# 44 magnetospheric 44 Venusian 44 astronomical telescope 44 Circinus X 1 44 ST5 44 Lagoon Nebula 44 Hubble orbits 44 constellation Lyra 44 SMOS 44 angular velocity 44 spacecraft orbited 44 Mercury Uranus 44 Phaethon 44 orbiting spacecraft 44 MG J# +# 44 ROCSAT 2 44 planet transits 44 cesium atom 44 axis perpendicular 44 dipole moment 44 millimeter wavelength 44 JIMO 44 Saturn Jupiter Uranus 44 proplyds 44 gravitationally 44 inertial guidance 44 moon Titan 44 Earth orbit LEO 44 GRBs 44 RQ# 44 Cloud Aerosol Lidar 44 constellation Ophiuchus 44 celestial objects 44 silicate dust 44 spaceward 44 Anisotropy Probe WMAP 44 lunar module Eagle 44 satellites orbiting Earth 44 sols 44 P Churyumov Gerasimenko 44 galactic halo 44 Philae lander 44 Dhanu Rashi 44 unmanned lunar orbiter 44 stationary lander 44 orbiting Kepler telescope 44 Kuiper Belt 44 Horizons spacecraft 44 Apophis asteroid 44 magnetic dipole 44 smallest extrasolar planet 44 geo stationary satellites 44 gravitational lenses 44 Uranus Neptune 44 satellites 44 rotational inertia 44 coronal hole 44 circumlunar 44 transiting planets 44 interferometer 44 Gerhard Schwehm 44 magnetic reconnection 44 heavily cratered 44 SBSS satellite 44 VIRTIS 44 Hipparcos 44 Lulin 44 geosynchronous satellite 44 Isidis Planitia 44 comet Hartley 2 44 Ring Nebula 44 astronomical objects 44 dynamical evolution 44 Phoebe orbits 44 lensing galaxy 44 X ray emission 44 Coma Cluster 44 Lunar Reconnaissance Orbiter 44 electronvolts 44 parsec 44 neighboring Andromeda galaxy 44 Skynet 5B 43 renamed GOES 43 Anik F3 43 flybys 43 polar orbiting 43 Red Rectangle 43 navigate autonomously 43 electron orbits 43 X ray binaries 43 Hot Jupiters 43 Itokawa asteroid 43 planet Gliese #c 43 2 MeV electron 43 Hayabusa probe 43 Pluto dwarf 43 Tanegashima Space Center 43 Cosmic rays 43 orbiter Mars Odyssey 43 neutron star 43 zodiacal constellations 43 starlike object 43 Pluto moon Charon 43 asteroids orbiting 43 constellation Puppis 43 cosmic ray flux 43 crewed spacecraft 43 lunar surface 43 INSAT 3A 43 COROT exo 3b 43 Enceladus 43 flyby Cassini 43 Anisotropy Probe 43 Leonid shower 43 Arabsat 5A 43 THEMIS 43 galaxy redshift 43 orbital angular momentum 43 Ranging MESSENGER spacecraft 43 planetoids 43 Glonass satellites 43 velocities 43 Ultraviolet Imaging Spectrograph UVIS 43 highly collimated 43 gibbous moon 43 axions 43 interstellar dust grains 43 laser altimeter 43 Alphabus 43 moon 43 telescopic observations 43 microwave photon 43 lunar orbiter 43 Mars Reconnaissance Orbiter MRO 43 moon gravitational pull 43 gamma ray bursts 43 NASA twin rovers 43 comet dust 43 Konacki 43 asteroidal 43 Henize #-# 43 comet Lulin 43 unmanned rover 43 Mercury exosphere 43 Io Europa 43 Sojourner rover 43 comets 43 ionospheric 43 manned spacecraft Shenzhou VI 43 thruster firings 43 extrasolar planetary 43 ionized gas 43 enters lunar orbit 43 asteroid Ceres 43 Soyuz landings 43 GRB #B 43 geyser plumes 43 ultraviolet spectrograph 43 quantum particle 43 Shackleton crater 43 Cassini ion 43 hydrostatic equilibrium 43 winged spacecraft 43 carry heavier payloads 43 VLBA observations 43 detect gamma rays 43 Spitzer infrared spectrograph 43 protoplanetary 43 JWST 43 spaceplane 43 gradiometer 43 asteroid flyby 43 X ray emitting 43 orbiters 43 XO 3b 43 Epimetheus 43 spherical halo 43 Mars Pathfinder lander 43 waning gibbous moon 43 particle detector 43 supernova 43 planetary nebulae 43 annular eclipse 43 GOES O 43 Earth 43 X ray pulses 43 planetary transits 43 lunar orbiter Chang'e 43 proto galaxies 43 antiproton 43 planets orbiting 43 geo stationary 43 Orbiter LRO 43 JCSAT 9 43 parsecs 43 protostars 43 twin rover Opportunity 43 habitable zones 43 thrilling stargazers 43 tropopause 43 R Coronae Borealis 43 PSLV C 43 cosmic ray particles 43 Midheaven 43 orbiting gamma ray 43 nucleon 43 spacecraft Hayabusa 43 supermassive black hole 43 gamma ray emission 43 Aurigae 43 Wolf Rayet stars 43 obscuration 43 WFPC2 43 constellations Cygnus 43 swingby 43 sun corona 43 planetesimals 43 Samuel Oschin Telescope 43 superfluid helium 43 Planetary Camera 2 43 meridional flow 43 Hubble Space Telescope 43 milliarcseconds 43 AUs 43 MN4 43 interstellar medium 43 geosynchronous Earth 43 MetOp 43 NASA twin STEREO 43 Galileo satellites 43 exoplanet discoveries 43 exoatmospheric kill vehicle 43 planet HD#b 43 moon Mimas 43 Glonass navigation satellites 43 dexterous robot 43 energetic electrons 43 Cosmic Microwave Background 43 Magnetic Imager HMI 43 SN #A 43 Comet Tempel Tuttle 43 precession 43 globular cluster M# 43 velocity vector 43 thruster 43 telescope 43 GSLV rocket 43 attoseconds 43 Astrological lore 43 inner moons 43 particle analyzers 43 constellation Vulpecula 43 barred spiral galaxy 43 chromosphere 43 metallicity 43 Elenin 43 energetic gamma rays 43 sunspot numbers 43 outer corona 43 Scorpius 43 #.#nm [002] 43 astronomers 43 sunward 43 GOCE satellite 43 Solar Terrestrial Relations 43 Interior Laboratory GRAIL 43 Chi Cygni 43 thruster rockets 43 meteorological satellites 43 coronagraph 43 planets asteroids 43 EPOXI spacecraft 43 nebulae 43 polar vortex 43 scramjet engine 43 Infrared Astronomy 43 wavelength infrared 43 constellation Aquila 42 Huygens descent 42 photometry 42 HIP #b