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(Click for frequent words.) 65 planets orbits 63 Toutatis 63 planetoids 63 occultations 63 Galilean moons 62 elongated orbits 62 Upsilon Andromedae 62 Comet Halley 62 Churyumov Gerasimenko 62 Kuiper belt objects 61 HM Cancri 61 Comet Hartley 2 61 retrograde orbit 61 Kuiper Belt Object 60 planet Uranus 60 Solar TErrestrial RElations Observatory 60 moons orbiting 60 Jovian moons 60 celestial sphere 60 Voyager spacecraft 60 exoplanets planets 60 planetary nebulae 60 Epsilon Eridani 59 galaxy M# [001] 59 Saturn Cassini 59 Wolf Rayet stars 59 gaseous planet 59 Pluto Charon 59 Cosmic Microwave Background 59 X ray telescopes 59 interstellar particles 59 TrES 4 59 gravitational lenses 59 mu Arae 58 eccentric orbits 58 moon Io 58 Milky Way halo 58 icy comets 58 Delta Cephei 58 retrograde orbits 58 Pluto Eris 58 Nasa spacecraft 58 NASA MESSENGER spacecraft 58 eclipsing binary 58 Kuiper Belt objects 58 WASP #b 58 outer planets 58 IBEX spacecraft 58 Orion nebula 58 millisecond pulsars 58 elliptical orbits 58 millisecond pulsar 58 spacecraft Cassini 58 Planck satellite 58 satellites orbiting Earth 58 trans Neptunian objects 58 sunlike star 58 Triangulum 58 merging galaxies 58 microquasar 57 Zeta Ophiuchi 57 binary asteroid 57 Ulysses spacecraft 57 Galileo spacecraft 57 Pleiades cluster 57 icy moons 57 gamma ray observatory 57 heliospheric 57 Helix Nebula 57 prograde 57 inhabitable planets 57 Cassini Huygens 57 retroreflector 57 spiral galaxy NGC 57 planetary orbits 57 Geminga 57 coronal loops 57 Kuiper Belt Objects 57 Milky Way Galaxy 57 comets orbiting 57 Omega Centauri 57 Andromeda galaxy 57 sunlike stars 57 Ring Nebula 57 nebular 57 Super Earths 57 protoplanet 57 ecliptic plane 57 P/# A2 57 exoplanet orbiting 57 infrared telescopes 57 X ray binary 57 NASA Voyager spacecraft 57 Cepheid variables 57 interstellar cloud 57 Comet Hartley 57 planet orbits 56 extrasolar 56 galactic disk 56 interplanetary spacecraft 56 planemos 56 circumstellar disks 56 GJ #b [001] 56 circular orbits 56 Explorer WISE 56 planetary Transits 56 Oort Cloud 56 GALEX 56 Corot 7b 56 Oort cloud 56 Beta Pictoris b 56 constellation Aquarius 56 slender crescent 56 Kepler 9c 56 exoplanets orbiting 56 Comet Elenin 56 gravitationally bound 56 Exoplanets 56 Mars landers 56 redshifted 56 astrophysical phenomena 56 SMBH 56 Neutron stars 56 lunar equator 56 spacecraft flyby 56 Heliospheric Observatory SOHO 56 infrared observatory 56 ESA Huygens probe 56 innermost planet 56 cluster NGC 56 Voyager probes 56 geosynchronous satellites 56 Kuiper belt 56 KBOs 56 planets orbiting stars 56 orbits Saturn 56 Crab Pulsar 56 Hale Bopp 56 OGLE TR #b 56 Hot Jupiters 56 exoplanetary 56 ESO VLT 56 RXTE 56 orbiter Cassini 55 moonlets 55 Saturnian 55 infrared astronomy 55 planets Uranus 55 Bug Nebula 55 highly elliptical orbits 55 Jupiter magnetosphere 55 Elenin 55 sundog 55 magnetotail 55 Epsilon Aurigae 55 Comet Machholz 55 impactor spacecraft 55 Rosette Nebula 55 NASA Cassini spacecraft 55 unmanned probes 55 reentry capsule 55 orbits 55 planetoid 55 smallest exoplanet 55 RY Sagittarii 55 Andromeda Galaxy 55 constellation Eridanus 55 New Horizons spacecraft 55 HD#b 55 distant supernovae 55 dwarf spheroidal 55 Kuiper Belt object 55 planets 55 Stephan Quintet 55 Samuel Oschin Telescope 55 Sojourner rover 55 X ray observatory 55 planets comets 55 Fomalhaut b 55 magnetars 55 asteroid Lutetia 55 THEMIS satellites 55 relativistic jets 55 planets moons 55 Cancri e 55 elongated orbit 55 Proxima Centauri 55 planets asteroids 55 SN #A 55 SIRTF 55 Mössbauer 55 supernovae explode 55 geostationary orbits 55 stellar occultations 55 exo planets 55 NASA EPOXI mission 55 Saturnian moons 55 moons Phobos 55 spiral galaxy Messier 55 Hubble Space Telescope HST 55 constellation Hercules 55 cosmic cannibal 55 NASA THEMIS 55 gravitational perturbations 55 galaxy NGC 55 CoRoT #b 55 neutralinos 55 ESA Rosetta 55 GJ #b [002] 55 Venusian 55 protostar 55 Evolution Explorer 54 NASA Stardust spacecraft 54 coronal mass ejections CMEs 54 distant galaxy 54 Titan flyby 54 Horsehead Nebula 54 Jupiter Saturn 54 rotational axis 54 moon Phobos 54 XO 3b 54 Kuiper belt object 54 galaxy M# [002] 54 AU Mic 54 BepiColombo 54 cosmological distances 54 constellation Virgo 54 asteroids comets 54 orbiting 54 gaseous planets 54 blue supergiant 54 Comet Holmes 54 Saturn rings 54 accretion disks 54 Cometary 54 relativistic particles 54 planets orbiting distant 54 Flyby spacecraft 54 brightest supernova 54 TNOs 54 Saturn moon Iapetus 54 asteroidal 54 BLG #Lb 54 exosphere 54 airglow 54 Bullet Cluster 54 globular cluster M# 54 lunar orbits 54 solar radii 54 Antennae Galaxies 54 spacecraft orbiting 54 Earthlike 54 Sagittarius dwarf galaxy 54 Supernova #A 54 LORRI 54 Hanny Voorwerp 54 luminous galaxies 54 orbital rendezvous 54 spherical halo 54 orbiting observatories 54 IRAS #-# 54 Gliese #c 54 comets asteroids 54 zodiacal light 54 Wolszczan 54 extrasolar planetary systems 54 Earth radii 54 sidereal 54 blazars 54 ATV Johannes Kepler 54 EPOXI spacecraft 54 spiral nebulae 54 Comet Shoemaker Levy 54 constellation Cassiopeia 54 NASA STEREO 54 Mars moon Phobos 54 Keck Telescopes 54 moonlet 54 constellation Ursa Major 54 RS Ophiuchi 54 highly elliptical orbit 54 Quadrantids 54 Galilean satellites 54 supergiant star 54 lensing galaxy 54 Dumbbell Nebula 54 ray Space Telescope 54 Pleiades star 54 Beta Pictoris 54 filamentary structure 54 Lagoon Nebula 54 rover Sojourner 54 Comet NEAT 53 Galactic cosmic rays 53 Eridani 53 intrinsic brightness 53 comet tail 53 circumstellar disk 53 orbited Jupiter 53 Comet #P/Churyumov-Gerasimenko 53 microlensing events 53 Virgo Cluster 53 NASA Lunar Prospector 53 twin STEREO spacecraft 53 NASA Cassini 53 Ultraviolet Imaging Spectrograph UVIS 53 telescopic observations 53 proplyds 53 flyby spacecraft 53 Viking Lander 53 hexagonal mirrors 53 Cassini flyby 53 protostars 53 extragalactic 53 Higgs bosons 53 planetary nebula 53 planets orbiting sun 53 Mars Pathfinder 53 Martian rovers 53 planetary surfaces 53 Earth orbiting satellites 53 gravitational tides 53 Earthlike planet 53 exo planet 53 Red Rectangle 53 constellation Andromeda 53 meteoroids 53 BP Psc 53 APXS 53 twin Voyager spacecraft 53 electron ion 53 Comet Lulin 53 Perseus Cluster 53 jovian 53 X ray observatories 53 CoRoT 7b 53 X ray wavelengths 53 protoplanets 53 lunar crust 53 Jupiter Ganymede 53 planetary transits 53 supermassive 53 STEREO spacecraft 53 SMBHs 53 moon Ganymede 53 galactic halo 53 distant quasar 53 robotic spacecraft 53 Cygnus Lyra region 53 extrasolar planet 53 Mini Thermal Emission 53 interstellar dust 53 Halley comet 53 Saturnian moon 53 ringed planet 53 transiting planet 53 spacecraft orbited 53 red supergiant 53 observable universe 53 Gliese #e 53 Milky Way galaxy 53 star Gliese 53 giant elliptical galaxy 53 Arches Cluster 53 Comet Churyumov Gerasimenko 53 Rosetta spacecraft 53 COROT 53 detect gravitational waves 53 planetary nebulas 53 dynamical evolution 53 ESA Planck 53 Relations Observatory STEREO 53 Keck telescope 53 Rosetta orbiter 53 supersymmetric particles 53 Keck telescopes 53 Hubble orbits 53 Wilkinson Microwave Anisotropy Probe 53 WISE spacecraft 52 zodiacal constellations 52 #P/Churyumov-Gerasimenko 52 Planetary Transits 52 dwarf galaxies 52 protoplanetary disks 52 rovers Spirit 52 spherically symmetric 52 COROT 7b 52 Tycho Brahe 52 elliptical galaxy 52 planet Gliese #g 52 Martian terrain 52 Triangulum Galaxy 52 COROT exo 3b 52 gamma ray telescopes 52 magnetospheric 52 SOHO spacecraft 52 proto cluster 52 globulars 52 galaxies collide 52 NASA CloudSat 52 Mars Pathfinder lander 52 periodic dimming 52 spacecraft 52 Gliese #d 52 Fermi telescope 52 comet particles 52 Martian dust 52 QQ# 52 Great Orion Nebula 52 distant quasars 52 Pulsars 52 planet HD #b 52 elliptical galaxy NGC 52 V# Mon 52 TrES 52 protoplanetary 52 Earthlike planets 52 galactic clusters 52 interstellar dust grains 52 Saturnian moon Titan 52 Saturn moons 52 circumstellar 52 Jupiter Uranus 52 flyby Cassini 52 interstellar dust particles 52 Carina constellation 52 gamma ray photons 52 Upsilon Andromedae b 52 Cepheids 52 Cancri 52 asteroids orbiting 52 comet Hale Bopp 52 Earth magnetosphere 52 constellation Taurus 52 Foton M3 52 WMAP satellite 52 Lunar Reconnaissance Orbiter LRO 52 hypervelocity stars 52 GQ Lupi 52 Trapezium 52 Small Magellanic Cloud 52 moons orbiting Saturn 52 NASA ICESat 52 starburst galaxy 52 photosphere 52 proto galaxies 52 Haumea 52 Coma Cluster 52 ESA Herschel 52 ENAs 52 RRATs 52 gravitational interactions 52 robotic rover Spirit 52 Exoplanet 52 astrophysical objects 52 BP Piscium 52 Uranus Neptune 52 Crab pulsar 52 XMM Newton satellite 52 Comet LINEAR 52 Giovanni Cassini 52 Gravitational lensing 52 exoplanet hunter 52 Trojan asteroids 52 spacetime 52 antimatter particles 52 SDSS II 52 Konacki 52 electron orbits 52 ROSAT 52 Dwarf galaxies 52 comet McNaught 52 Viking orbiters 52 zodiacal dust 52 Foton spacecraft 52 Observatory SDO 52 NASA twin STEREO 52 Heliospheric Observatory 52 Orion Nebula 52 comet hurtling 52 spacecrafts 52 constellation Cetus 52 celestial object 52 Mars rovers Spirit 52 NGC# 52 cosmic ray particles 52 rocky extrasolar planet 52 HiRISE camera aboard 52 astronomical observations 52 tidal tails 52 AGNs 52 super Earths 52 spiral galaxy 52 occulted 52 extraterrestrial UFOs 52 Shepherding Spacecraft 52 spiral galaxies 52 Neptune Uranus 52 Gerard Kuiper 52 Convection Rotation 52 Henize #-# 52 SN #C 52 Solar Orbiter 52 gravitational slingshot 52 Solar Dynamics Observatory 52 supergiant stars 52 Kuiper Belt 52 stellar occultation 52 Hipparcos 52 Orion constellation 52 Comet Tempel 1 52 interstellar dust clouds 52 ESA ERS 52 infall 52 RHESSI 52 cosmological observations 51 Magellanic Clouds 51 lunar landers 51 Uranian 51 Voorwerp 51 galactic bulge 51 Eagle Nebula 51 Eridanus 51 supernova explosion 51 eclipsing binaries 51 polarimetry 51 transiting exoplanet 51 infalling 51 binary asteroids 51 arcminutes 51 Infrared Astronomical Satellite IRAS 51 ESA SMART 51 astronomical telescope 51 inner asteroid belt 51 Interstellar Boundary Explorer 51 Herbig Haro 51 globular cluster 51 Apophis asteroid 51 NASA rover Spirit 51 magnetospheres 51 Herschel telescope 51 submillimetre 51 closest flyby 51 AB Aurigae 51 interstellar clouds 51 ESO PR 51 XMM Newton 51 stellar nurseries 51 NASA twin rovers 51 Trifid 51 Martian crater 51 Butterfly Nebula 51 galactic cosmic rays 51 lobate scarps 51 Planck spacecraft 51 linearly polarized 51 Charon Pluto 51 prominences 51 muon neutrino 51 gravitational microlensing 51 HL Tau 51 NASA Gamma ray 51 Solar System 51 moon Enceladus 51 asteroid Steins 51 moon Charon 51 GRB #B 51 Hale Bopp comet 51 Coma cluster 51 moon Mimas 51 GJ#b 51 Tauri Sb 51 Chilean Atacama Desert 51 planet Nibiru 51 UDFy # 51 Stardust spacecraft 51 Venus transits 51 energetic cosmic rays 51 Saturn Enceladus 51 Meteor showers 51 Mercury magnetosphere 51 Lutetia 51 Muons 51 proto planetary disks 51 Type Ia supernova 51 zodiac constellations 51 amateur skywatchers 51 X ray photons 51 interstellar grains 51 inner Oort Cloud 51 Observatory STEREO 51 spectrographs 51 Virgo cluster 51 synchronous orbit 51 GA6 51 Io Europa 51 Submillimeter Array 51 Encke gap 51 celestial mechanics 51 dusty disks 51 Deep Impact flyby spacecraft 51 Telescope LSST 51 rotating neutron stars 51 Antennae galaxies 51 meter Keck telescope 51 cometary debris 51 LCROSS Lunar Crater Observation 51 Hubble observations 51 ESO telescopes 51 ionized gases 51 nebulosity 51 Olympus Mons 51 Magnetars 51 sized planets orbiting 51 submillimetre wavelengths 51 VLTI 51 plutoids 51 Earths orbiting 51 IRC +# 51 Suzaku X ray 51 Noctilucent clouds 51 comet nucleus 51 planetary magnetospheres 51 earthshine 51 Solar Terrestrial Relations 51 red supergiants 51 extrasolar planets 51 Cassini spacecraft orbiting 51 moon Deimos 51 transiting planets 51 spectroscopic measurements 51 Enceladus flybys 51 earthlike planets 51 energetic electrons 51 VISTA telescope 51 Cosmonaut Yuri Gagarin 51 spacecraft Hayabusa 51 terrestrial planets 51 blazar 50 Cassini Huygens spacecraft 50 Reflection Radiometer 50 Viking landers 50 spatial dimensions 50 luminosities 50 arcseconds 50 Saturn outermost 50 SINFONI 50 THEMIS probes 50 protoplanetary disk 50 spaceward 50 planet Gliese #c 50 Lunar Crater 50 Itokawa asteroid 50 massless particles 50 Serpens Cauda 50 Chajnantor plateau 50 Heliospheric 50 dwarf galaxy 50 comet Tempel Tuttle 50 comet Lulin 50 Lulin Observatory 50 orbiter lander 50 Fermi Telescope 50 NASA Interstellar Boundary 50 asteroid Itokawa 50 GOCE satellite 50 Saturn moon Mimas 50 interferometers 50 NASA Kepler telescope 50 Climate Experiment GRACE 50 Chang'eI 50 nebula NGC 50 galaxies nebulae 50 ESA Cluster 50 Beehive Cluster 50 Methone 50 celestial phenomena 50 active galactic nuclei 50 Tunguska meteorite 50 meteoroid 50 magnetar 50 waxing crescent 50 silicate dust 50 planetary embryos 50 lunar orbiters 50 gamma ray detectors 50 astronomers 50 habitable worlds 50 nicknamed Xena 50 Ranging spacecraft 50 Jovian moon 50 globular clusters 50 Optical Gravitational Lensing Experiment 50 Cosmic Background Explorer 50 celestial observations 50 extraterrestrial civilizations 50 Stratellite 50 galaxy formation 50 Super Kamiokande 50 Orbiter LRO 50 superstrings 50 Yinghuo 1 50 ecliptic 50 steering wheel tilts 50 particle detectors 50 foreground galaxy 50 LCROSS spacecraft 50 Syrtis Major 50 CoRoT satellite 50 largest moon Charon 50 Epoxi 50 geoid 50 reionization 50 spaceborne 50 NASA Wilkinson Microwave 50 Hyades cluster 50 substorm 50 supernova remnant 50 magma ocean 50 extrasolar planets orbiting 50 X ray spectrometer 50 NEAR Shoemaker 50 SPHERES 50 gamma ray telescope 50 Magnetic Imager HMI 50 interstellar dust samples 50 Dynamics Observatory 50 Rosetta lander 50 Reconnaissance Orbiter 50 ESA XMM Newton 50 Cassini flybys 50 telescope eyepiece 50 Galaxy Evolution 50 X ray pulses 50 Hipparchus 50 Mars Reconnaissance Orbiter MRO 50 Orbiter MRO 50 outermost planet 50 Valles Marineris 50 Makemake 50 astrometry 50 interstellar boundary 50 Planck telescope 50 comets meteors 50 precessing 50 Hyakutake 50 constellation Pegasus 50 planetesimals 50 supernova explosions 50 PSR J# 50 XTE J# 50 Spectrograph 50 gamma ray flares 50 supernova remnants 50 outer corona 50 Array ALMA 50 galaxy 50 ultracold atoms 50 Neutron Spectrometer 50 quantum particle 50 infrared telescope 50 astronomer Johannes Kepler 50 robotic explorer 50 constellation Centaurus 50 PSR B# +# 50 V# Sgr 50 ellipsoid 50 Fornax cluster 50 Aqua satellite 50 Gamma ray bursts 50 constellation Auriga 50 J# +# [002] 50 Quadrantid meteor shower 50 solar corona 50 Titan flybys 50 Titan Saturn 50 celestial bodies 50 exoplanets 50 Cerro Paranal 50 chondrules 50 TerraSAR X satellite 50 Earth magnetotail 50 magnetic reconnection 50 Saturn magnetosphere 50 MESSENGER spacecraft 50 orbited 50 solar minima 50 Sombrero Galaxy 50 THEMIS spacecraft 50 cosmological theories 50 HARPS instrument 50 interacting galaxies 50 dwarf planets 50 Crab Nebula 50 Lunokhod 50 gravitationally 50 comet Churyumov Gerasimenko 50 planets orbiting 50 tau neutrinos 50 antiparticle 50 Earth ionosphere 50 EPOXI 50 cosmic ray collisions 50 OGLE TR 50 polar vortex 50 silicon monoxide 50 thin crescent 50 WISE telescope 50 electrons orbiting 50 orbiting Saturn 50 ESA Integral 50 cosmic phenomena 50 stony meteorites 50 Quaoar 50 neutrino detectors 50 constellation Scorpius 50 supernovae explosions 50 supercontinents 49 Itokawa 49 Jupiter flyby 49 Saturn outermost ring 49 magnetic polarity 49 moons circling 49 starlike object 49 X ray binaries 49 Hubble Space telescope 49 gibbous 49 Trifid Nebula 49 nucleon 49 Spitzer infrared 49 sterile neutrinos 49 spectroscopically 49 GOCE 49 habitable planets 49 active galactic nucleus 49 inch Samuel Oschin 49 Gravitational waves 49 heliopause 49 auroral displays 49 carbonaceous chondrite 49 asterism 49 RS Oph 49 Shoemaker Levy 49 Diviner 49 Hubble Constant 49 galaxy clusters 49 comet 49 filamentary structures 49 robotic landers 49 gamma ray emission 49 magnetosphere 49 orbital velocity 49 faraway galaxy 49 Helioseismic 49 orbital resonance 49 SIM PlanetQuest 49 constellation Carina 49 Opportunity rovers 49 whiz harmlessly 49 Tau Ceti 49 sunward 49 proton antiproton 49 ionised gas 49 IKAROS 49 galactic nuclei 49 Ray Spectrometer 49 refractors 49 constellation Draco 49 Shackleton crater 49 Bok globules 49 WD5 49 hadron 49 Orionids 49 SUSY 49 Anisotropy Probe WMAP 49 VIRTIS 49 atmospheric phenomena 49 gravitational pulls 49 constellation Sagittarius 49 comet Wild 49 comet chaser 49 spinning neutron 49 interstellar distances 49 Cat Paw Nebula 49 VY Canis Majoris 49 Cassini spacecraft 49 astronomical observatories 49 Wolf Rayet star 49 twin rovers Spirit 49 waxing gibbous moon 49 Astrophysical 49 HiRISE image 49 baryon 49 VHE gamma rays 49 brown dwarfs 49 galaxies 49 redshifts 49 spinning neutron stars 49 LRO spacecraft 49 gamma ray burst 49 orbiting spacecraft 49 crustal plates 49 extraterrestrial civilization 49 SN#A 49 Infrared Mapping Spectrometer VIMS 49 SN #gy 49 reddish orange hue 49 Io volcanoes 49 Canis Major 49 martian atmosphere 49 NASA rover Opportunity 49 radial velocity 49 waning gibbous 49 dirty snowballs 49 hot Jupiters 49 cometary dust 49 HD #b [001] 49 proto planetary disk 49 particle smasher 49 Martian moons Phobos 49 optical wavelengths 49 Shackleton Crater 49 WISE infrared 49 antineutrinos 49 constellation Ara 49 NASA Cassini orbiter 49 comet #P/Churyumov-Gerasimenko 49 Kepler Mission 49 Martian craters 49 galaxy cluster 49 astronomy observatory 49 Asteroid Belt 49 robotic rovers 49 Flyby 49 Bonneville Crater 49 faraway galaxies 49 Kepler #b 49 constellation Coma Berenices 49 La Silla observatory 49 fainter objects 49 Comet Tempel Tuttle 49 Huygens lander 49 CALIPSO satellites 49 Mandushev 49 Express orbiter 49 particle acceleration 49 Helix nebula 49 S/# P2 49 electron neutrinos 49 Deep Impact comet 49 star Proxima Centauri 49 axial tilt 49 CERN LHC 49 gravitational lens 49 Saturnian system 49 Extragalactic 49 MG J# +# 49 dust mote 49 orbiting telescopes 49 particle analyzers 49 Infrared Pathfinder Satellite 49 PSR B# 49 Valles Marineris canyon 49 Saturn moons Titan 49 Great Observatories 49 Eta Carinae 49 accretion disk 49 transiting exoplanets 49 HAT P 49 CALIPSO 49 DISR 49 hadrons 49 extrasolar worlds 49 galaxy redshift 49 Orbiting 49 colliders 49 orbiter Mars Odyssey 49 GRACE satellites 49 LightSail 1 49 orbiting Mars 49 occultation 49 ALMA antennas 49 binary quasar 49 Tarantula Nebula 49 orbiting gamma ray 49 Spitzer infrared spectrograph 49 barred spiral galaxy 49 planetary astronomer 49 Kepler spacecraft 49 basaltic rocks 49 ENVISAT 49 Deep Impact craft 49 axions 49 Hubble Telescope 49 penumbral shadow 49 V# Puppis 49 Venusian atmosphere 49 Tempel Tuttle 49 Jupiter moon Io