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(Click for frequent words.) 69 MN4 66 Apophis 65 Toutatis 62 Apophis asteroid 61 asteroid Apophis 61 asteroid 61 RQ# 61 gravitational keyhole 61 QQ# 61 GA6 60 YU# 60 WD5 58 GJ #b [001] 58 lunar perigee 58 TrES 4 58 smallest exoplanet 58 GJ#b 58 gaseous planet 58 Kepler 9c 58 Gliese #c 57 Corot 7b 57 Comet Hartley 57 Earth radii 57 Kepler #b 57 super perigee moon 57 WASP #b 57 meteoroid 57 GJ #b [002] 56 Kuiper Belt object 56 copper impactor 56 planetoid 56 Saturn moon Mimas 56 Comet Hartley 2 56 Mandushev 56 periodic dimming 56 Gliese #g 56 CoRoT 7b 56 P/# A2 55 moon Deimos 55 Jovian moons 55 Deep Impact craft 55 Cancri e 55 HD #b [001] 55 Asteroid 55 moonquakes 55 satellites orbiting Earth 55 tiny meteoroid 55 Charon Pluto 55 rover Opportunity 55 irregularly shaped asteroid 55 impactor spacecraft 54 Comet Tempel 1 54 Upsilon Andromedae b 54 protoplanet 54 Earthlike planet 54 Tunguska object 54 Yarkovsky effect 54 GRB #B 54 HD#b 54 Fomalhaut b 54 S/# S1 54 moons Phobos 54 Comet Elenin 54 Shackleton crater 54 cosmic cannibal 54 LCROSS spacecraft 54 orbital velocity 54 Timothy Spahr 54 NEAs 53 elongated orbits 53 #P/Churyumov-Gerasimenko 53 COROT exo 3b 53 asteroid Steins 53 Nasa spacecraft 53 planetary Transits 53 retrograde orbit 53 cosmic collisions 53 asteroid Lutetia 53 Comet Churyumov Gerasimenko 53 NASA Kepler telescope 53 asteroid Itokawa 53 Churyumov Gerasimenko 53 Comet Lulin 53 mu Arae 53 planemos 53 orbiting Kepler telescope 53 rover Spirit 53 Hayabusa capsule 52 Comet NEAT 52 TU# [002] 52 planet Uranus 52 Steins asteroid 52 whiz harmlessly 52 Isidis Planitia 52 EPOXI spacecraft 52 robotic explorer 52 Opportunity rover 52 Titan flyby 52 star Proxima Centauri 52 CoRoT #b 52 VD# [001] 52 Itokawa 52 Gamma ray burst 52 Corot 9b 52 radial velocity 52 planet Nibiru 52 Comet LINEAR 52 retrograde orbits 52 Martian rovers 52 six wheeled rover 52 CoRoT 9b 52 perigee 52 bedrock outcropping 52 arcseconds 52 Venusian surface 52 Oort cloud 51 CoRoT 51 protoplanets 51 icy comets 51 Mount Bosavi 51 Martian crater 51 slender crescent 51 Earth magnetotail 51 YORP effect 51 Jovian moon 51 SuperMoon 51 Gusev crater 51 inner Oort Cloud 51 Asteroid Itokawa 51 thin crescent moon 51 airglow 51 thin crescent 51 Ontario Lacus 51 comet Lulin 51 Express orbiter 51 smallest extrasolar planet 51 asteroid flyby 51 Kepler spacecraft 51 COROT 7b 51 impactor 51 particle smasher 51 Pluto Charon 51 moon Enceladus 51 Jupiter moon Io 51 Epsilon Aurigae 51 comet nucleus 51 Saturnian moon Titan 51 exo planets 51 closest flyby 51 Pluto Eris 51 Asteroid Apophis 51 waxing gibbous moon 51 Kuiper Belt Object 51 Meteor shower 51 S/# P2 51 asteroid impacts 51 Comet #P/Churyumov-Gerasimenko 51 Cabeus 51 moonlet 51 Messenger spacecraft 51 HD #b [002] 51 flyby spacecraft 51 inhabitable planets 51 antiproton 51 New Horizons spacecraft 51 umbral shadow 51 aphelion 51 Bonneville Crater 51 COROT 51 rover Spirit landed 51 Goldilocks planet 51 BP Piscium 51 Opportunity Mars rover 51 cosmic microwave radiation 51 Saturn moon 51 Comet Halley 51 Tunguska Siberia 51 Galilean moons 51 spacecraft Cassini 50 apogee farthest point 50 Gliese #e 50 geostationary orbits 50 lander Beagle 2 50 Higgs particle 50 Martian rover 50 Oort Cloud 50 spacecraft orbiting 50 Torino Scale 50 rocky extrasolar planet 50 Epoxi 50 Mars Odyssey spacecraft 50 KT extinction 50 Quadrantid meteor shower 50 Ulysses spacecraft 50 bolide 50 Quadrantids 50 penumbral shadow 50 arcsecond 50 Ranging spacecraft 50 prograde 50 comet McNaught 50 Planck satellite 50 twin rover Spirit 50 Beta Pictoris b 50 celestial equator 50 gravitational lens 50 Arches Cluster 50 Hellas Basin 50 Saturn Cassini 50 X ray afterglow 50 comet 50 galactic alignment 50 Gliese #d 50 Cassini flyby 50 smoothed sunspot number 50 Solar Terrestrial Relations 50 Tunguska asteroid 50 GOCE satellite 50 heliopause 50 Martian equator 50 planet Gliese #g 50 BLG #Lb 50 Undocking 50 radial velocity method 50 Today waxing Virgo 50 rover Sojourner 50 Convection Rotation 50 Drygalski ice tongue 50 twin rover Opportunity 50 Mars moon Phobos 50 penumbral lunar eclipse 50 Omega Centauri 50 Lutetia 50 micrometeoroids 50 asteroids 50 Elenin 50 NASA rovers Spirit 50 smallest exoplanets 50 extrasolar planets orbiting 50 Shiveluch 50 geo stationary orbit 50 foam fragment 50 equatorial plains 50 UB# [003] 50 twin Voyager spacecraft 50 APXS 50 Phoebe orbits 50 wheeled rover 50 MUSES C 49 dustier stormier atmosphere 49 geomagnetic activity 49 Rosetta spacecraft 49 Chicxulub crater 49 interplanetary spacecraft 49 Andaman Islands quake 49 Flyby spacecraft 49 axial tilt 49 interstellar dust particles 49 constellation Taurus 49 Mars Lander 49 Curiosity rover 49 sized planets orbiting 49 asteroid Eros 49 gravitational slingshot 49 Capricornus 49 Libra constellation Vogt 49 pericentre 49 Geminid meteor showers 49 gravitational tugs 49 windshield wiper maneuver 49 synchronous orbit 49 habitable worlds 49 Titan smoggy 49 Zeta Ophiuchi 49 Saturn moon Iapetus 49 Orionids 49 planets orbiting sun 49 Cosmic Microwave Background 49 Asteroid Belt 49 GQ Lupi 49 lightweight synthetic aperture 49 celestial object 49 Bug Nebula 49 aboard Taurus XL 49 HL Tau 49 Ringed Planet 49 moon Phobos 49 Samuel Oschin Telescope 49 Giove B 49 Pleiades cluster 49 asteroid collisions 49 comet tail 49 millisecond pulsar 49 SIM PlanetQuest 49 Orbiter MRO 49 starlike object 49 comets orbiting 49 Vastitas Borealis 49 Galileo spacecraft 49 Kuiper belt objects 49 Perseid shower 49 NASA Stardust spacecraft 49 Taepondong 2 49 asteroid hurtling 49 Kepler 9b 49 Delta Cephei 49 comet particles 49 planets orbits 49 Higgs boson particle 49 Cosmic ray 49 red supergiant 49 Tunguska meteorite 49 IntergalaticEarth 49 unmanned rover 49 super Earths 49 Giovanni Cassini 49 Martian permafrost 49 Lunokhod 49 PSR J# 49 GT9 49 Kuiper Belt objects 49 polar craters 49 Pleiades star 49 occultations 49 Saturnian moon 49 sun synchronous orbit 49 constellation Aquarius 49 Cumbre Vieja 49 Fermi telescope 49 colliding asteroids 49 highly elliptical orbit 49 Meteor showers 49 Earth rotational axis 49 orbited Jupiter 49 detect gravitational waves 49 transiting planet 49 NASA Opportunity rover 49 Gliese #G 49 gaseous planets 48 planets Uranus 48 orbiting telescope 48 Saturn moons 48 outermost planets 48 GEochemistry 48 orbital inclination 48 Mars Reconnaissance Orbiter MRO 48 orbiting Mars 48 exoplanetary 48 Quaoar 48 Sun synchronous orbit 48 Spaceguard Survey 48 cosmological distances 48 Epsilon Eridani 48 planet TrES 48 moon gravitational pull 48 waxing crescent 48 comets meteors 48 lunar equator 48 brightest supernova 48 Higgs bosons 48 Viking orbiters 48 Mars rover Opportunity 48 SN #C 48 Eta Aquarid meteor shower 48 Cassini Huygens spacecraft 48 Tempel Tuttle 48 Aqua satellite 48 waning crescent Moon 48 Huygens descent 48 NASA Kepler spacecraft 48 sterile neutrino 48 Cryosat 48 orbital resonance 48 Syrtis Major 48 meteoritic material 48 exoplanets orbiting 48 magnetar 48 milliarcseconds 48 Solar Dynamics Observatory 48 moons orbiting 48 Lake Cheko 48 Caloris Basin 48 Mars Squyres 48 Foton spacecraft 48 polar vortex 48 microquasar 48 infrared observatory 48 OGLE TR 48 CryoSat satellite 48 geomagnetic storm 48 Martian dust 48 Plutoids 48 XP# [004] 48 hazardous eruption 48 orbiting 48 Phaethon 48 jagged ridge 48 aperture telescope 48 Eta Carinae 48 Pluto dwarf 48 ESA Rosetta 48 coronal mass ejection 48 Deep Impact comet 48 Mini TES 48 Jupiter icy moons 48 constellation Hercules 48 Ring Nebula 48 Cassini flybys 48 ray Space Telescope 48 innermost planet 48 Supermoon 48 circular orbit 48 Jupiter Ganymede 48 probe Huygens 48 supermoon 48 Extrasolar 48 Comet McNaught 48 perihelion 48 Mössbauer 48 WISE spacecraft 48 SN #A 48 Sasselov 48 arcminutes 48 NASA LCROSS 48 galactic disk 48 icy moons 48 Upsilon Andromedae 48 Perseids Meteor Shower 48 gravitationally bound 48 planet WASP #b 48 GOSAT 48 PSLV C6 48 ejecta blanket 48 hypervelocity star 48 extrasolar planet 48 dust mote 48 spacecraft flyby 48 Comet Machholz 48 Grammier 48 planets Kepler 48 celestial sphere 48 galaxy M# [001] 48 SMOS mission 48 Cassini spacecraft 48 Swift Tuttle 48 Earthlike 48 smoothest flattest spot 48 Arsia Mons 48 Kuiper Belt Objects 48 Orbiter LRO 48 Methone 48 NASA MESSENGER spacecraft 48 Yinghuo 1 48 Kuiper belt object 48 Voorwerp 48 Big Bang Machine 47 reentry capsule 47 cosmic ray collisions 47 Earthly contamination 47 Kosmos 3M rocket 47 impactors 47 waxing gibbous 47 exoplanet orbiting 47 Tharsis Rise 47 Grímsvötn volcano 47 Meridiani plains 47 RY Sagittarii 47 journal Meteoritics 47 planetary orbits 47 X ray observatory 47 tephra dam 47 volcanic plumes 47 Halley Comet 47 jovian 47 constellation Sagittarius 47 Leonid meteor showers 47 rotational axis 47 Erik Asphaug 47 distant quasar 47 gravitational tides 47 Sedna 47 reconnaissance orbiter 47 Saturn moon Enceladus 47 OSIRIS Rex 47 planet HD #b 47 polar orbit 47 ballistic trajectory 47 Huygens spacecraft 47 Tunguska explosion 47 neighboring Andromeda galaxy 47 Voyager spacecraft 47 Saturn rings 47 Martian lander 47 hypersonic speeds 47 lunar orbiter Chang'e 47 geo synchronous orbit 47 auroral activity 47 Saturn Enceladus 47 Helios 2B 47 albedo reflectivity 47 Infrared Pathfinder Satellite 47 Mars Orbiter 47 Kepler Telescope 47 infrared telescope 47 rotates clockwise 47 Hale Bopp 47 galaxy M# [002] 47 lander rover 47 Orionid meteor shower 47 orbiting Cassini spacecraft 47 coronal holes 47 Nili Fossae 47 Galilean satellites 47 Doppler shift 47 comets asteroids 47 moons Europa 47 orbital eccentricity 47 SCP #F# 47 SIRTF 47 Uranus Jupiter 47 Oceansat 2 47 perilune 47 Tunguska Event 47 Donald Yeomans 47 Trojan asteroids 47 TrES 47 extrasolar worlds 47 PSR B# 47 laser altimeter 47 Ares IX booster 47 Geminids 47 Triangulum 47 ESA XMM Newton 47 spiral nebulae 47 exoatmospheric kill vehicle 47 volcanic moon Io 47 waxing crescent moon 47 probe Chang'e 47 zodiacal light 47 Victoria Crater 47 Uranus 47 LAGEOS 47 telescope orbits 47 comet Wild 47 planet gravitational tug 47 Comet Holmes 47 Comet 9P/Tempel 1 47 tidally locked 47 OGLE TR #b 47 MESSENGER spacecraft 47 Cassini Huygens 47 Borealis basin 47 Rosetta lander 47 magnetic polarity 47 comet #P/Churyumov-Gerasimenko 47 Crab Nebula 47 planet magnetosphere 47 perigee moon 47 Halley comet 47 P Churyumov Gerasimenko 47 RX# [003] 47 Sojourner rover 47 moonlets 47 moons orbiting Saturn 47 Kepler observatory 47 equatorial orbit 47 ESA ASI 47 Mini Thermal Emission 47 Enceladus 47 galactic clusters 47 hydrologist Carolyn Driedger 47 geo synchronous 47 Phobos Grunt 47 lensing galaxy 47 icy moon Enceladus 47 Helix Nebula 47 telescopic observations 47 NASA rovers 47 eclipsing binary 47 lunar module Eagle 47 INSAT 4CR 47 onboard Chandrayaan 47 constellation Cygnus 47 NASA Cassini spacecraft 47 outer corona 47 Ares IX rocket 47 Foton M3 47 Baptistina 47 shepherding spacecraft 47 lunar orbits 47 meter diametre 47 Wolszczan 47 MG J# +# 47 constellation Lyra 47 Phobos 47 cometary debris 47 Eridani 47 NASA Spacecraft 47 Cepheid variables 47 stationary lander 47 Earth asteroid Itokawa 47 Taurids 47 ringed planet 47 Ariane rocket 47 comet chaser 47 planets orbiting distant 47 MIT planetary scientist 47 Gerard Kuiper 47 shadowed craters 47 strangelet 47 Saturnian system 47 S/# [001] 46 Chicxulub 46 largest moon Charon 46 sub glacial lakes 46 moon Io 46 supersymmetric particles 46 NASA rover Spirit 46 amateur skywatchers 46 orbiting Hubble Space Telescope 46 gravitational redshift 46 Kaguya spacecraft 46 Neanderthals Homo neanderthalensis 46 faint smudge 46 hypervelocity stars 46 SN #D 46 orbits Saturn 46 Higgs singlet 46 Martian plains 46 Comet Boethin 46 Lunar Reconnaissance Orbiter LRO 46 geysers erupting 46 buckypaper virtually 46 waning crescent 46 comet dust 46 meteoroids 46 GRB # 46 Earthlike planets 46 Saturn outermost moon 46 Stardust mothership 46 Hubble orbits 46 extraterrestrial civilization 46 neutrino detectors 46 Red Rectangle 46 Sensing Satellite LCROSS 46 HIP #b 46 Wolf Rayet star 46 moon Mimas 46 asteroid Vesta 46 star Gliese 46 magnetopause 46 exosolar planets 46 orbital rendezvous 46 belched plume 46 Pu'u O'o 46 sunspot cycle 46 Antennae Galaxies 46 gamma ray observatory 46 Optical Spectroscopic 46 Hayabusa spacecraft 46 Lagrangian 46 Earth objects NEOs 46 GSLV D3 rocket 46 eruptive activity 46 Indonesia Merapi volcano 46 Stephan Quintet 46 El Teide 46 lunar crust 46 Meteor showers occur 46 waning gibbous 46 NROL 46 Owen Gingerich 46 geoid 46 lunar orbiting spacecraft 46 crater 46 Ofeq 46 comet Boethin 46 unmanned probes 46 Eta Aquarids 46 SOHO spacecraft 46 exoplanetary systems 46 Planetary Transits 46 Saturn outermost 46 meteor fragment 46 WISE telescope 46 cosmic magnifying glass 46 elongated orbit 46 constellation Eridanus 46 copper fortified impactor 46 martian atmosphere 46 exosphere 46 Cartosat 2B 46 robotic spacecraft 46 star Spica 46 Uranus Neptune 46 Asteroid Collision 46 Hot Jupiters 46 comet Churyumov Gerasimenko 46 KT boundary 46 isostatic rebound 46 Supernova #A 46 Comet #P 46 exoplanet discoveries 46 RX J# 46 Nibiru 46 Astronomically 46 outermost planet 46 constellation Ursa Major 46 JIMO 46 comet Hartley 2 46 spacecraft 46 spiral galaxy NGC 46 HiRISE camera 46 Mission TRMM satellite 46 NASA Kepler 46 lunar spacecraft Chandrayaan 46 Epimetheus 46 NASA Voyager spacecraft 46 hydroxyl molecules 46 Schwarzschild radius 46 crustal plates 46 Bullet Cluster 46 Halemaumau 46 lander 46 parabolic trajectory 46 STEREO spacecraft 46 Type Ia supernova 46 martian soil 46 interstellar particles 46 rover Curiosity 46 rover robotic arm 46 AB Aurigae 46 geyser plumes 46 Jupiter moons 46 GOCE 46 habitable planets 46 fissure eruption 46 Lunar CRater Observation 46 C1XS 46 Martian rocks 46 telescope Uranus 46 orbiting spacecraft 46 winged spacecraft 46 equatorial bulge 46 Chodas 46 Volcanologists 46 Mars Gusev Crater 46 NASA rover Opportunity 46 dimming starlight 46 Astronomically speaking 46 constellation Bootes 46 Hesperian Epoch 46 Shuttle Endeavor 46 circular orbits 46 preset orbit 46 NASA EPOXI mission 46 Mass extinctions 46 Cosmonaut Yuri Gagarin 46 planet Gliese #c 46 BepiColombo 46 #/#-minute climb 46 Hematite Slope 46 lunar crater 46 geoneutrinos 46 olivine mineral 46 constellation Scorpius 46 constellation Virgo 46 cometary impacts 46 Augustine Volcano 46 glacier calving 46 hunting Kepler telescope 46 constellation Carina 46 arcsec 46 Saturn equinox 46 Hubble Space Telescope HST 46 Mercury magnetosphere 46 Sara Seager 46 Heliospheric Observatory SOHO 46 Saturn outermost ring 46 Jenniskens 45 unstable lava dome 45 Cassini orbiter 45 Mars rovers Spirit 45 elliptical orbits 45 Chilean Atacama Desert 45 Shoemaker Levy 45 sunward 45 orbiter Cassini 45 Mars orbiting spacecraft 45 IBEX spacecraft 45 magnetotail 45 Martian orbit 45 Sriharikota spaceport 45 elliptical orbit 45 J# +# [002] 45 Venusian 45 PSLV C# 45 CoRoT satellite 45 orbiting observatory 45 Sagittarius B2 45 Yellowstone Caldera 45 OSIRIS REx 45 Chicxulub Crater 45 Huygens lander 45 Stardust spacecraft 45 Mars Phobos 45 dwarf planet 45 cryovolcanism 45 galaxy NGC 45 gravitational pulls 45 MErcury Surface Space ENvironment 45 moon Iapetus 45 NASA Aqua 45 boson 45 magnetic monopole 45 Viking Lander 45 Sagittarius dwarf galaxy 45 geomagnetic storms 45 Shackleton Crater 45 GZK cutoff 45 giant elliptical galaxy 45 crater Cabeus 45 geosynchronous orbits 45 Mount Karthala 45 sunlike star 45 cluster NGC 45 comet Tempel Tuttle 45 Kirishima range 45 Mount Katla 45 van Arkel discovery 45 landing Navias 45 NOAA GOES 45 antiparticle 45 planet orbits 45 PSLV C# rocket 45 radial velocity technique 45 Opportunity parachuted 45 Red Planet 45 Di Achille 45 Voyager probes 45 glacier shrinkage 45 Centaur rocket 45 NASA ICESat 45 foreshocks 45 permanently shadowed craters 45 distant galaxy 45 planetoids 45 Purgatory Dune 45 Endeavour Crater 45 observable universe 45 EGRET 45 radar altimetry 45 constellation Serpens 45 hypersonic glider 45 steering wheel tilts 45 magma boiling 45 THEMIS Images 45 electromagnetic signals 45 Nasa Deep Impact 45 Ranging MESSENGER spacecraft 45 Reconnaissance Orbiter 45 plutoids 45 Proba 2 45 Manned missions 45 Geminid meteors 45 Dwarf Planet 45 transiting planets 45 V# Mon 45 Cassini spacecraft orbiting 45 onrushing comet 45 orbiting Saturn 45 magnetars 45 lunar occultation 45 lunar spacecraft 45 Molten rock 45 rover 45 Earth Asteroid 45 Cabeus crater 45 quantum particle 45 frozen sunless 45 navigate autonomously 45 ESA GOCE 45 Don Yeomans 45 Chang'eI 45 gravitational microlensing 45 Martian surface 45 Rover Opportunity 45 Michibiki 45 Chandrayaan 45 strangelets 45 waning gibbous moon 45 Kuiper belt 45 Martian terrain 45 Sojourner Rover 45 waitress Ingrid Sufan 45 Crab Pulsar 45 NASA Gamma ray 45 Makemake 45 Mossbauer spectrometer 45 lunar poles 45 Endurance Crater 45 rotating counterclockwise 45 ExoMars rover 45 spinning clockwise 45 cataclysmic eruption 45 orbiter Mars Odyssey 45 gray hematite 45 manned lunar mission 45 Mars orbiter 45 rock outcrop 45 Muchachos Observatory 45 Geminids meteor shower 45 Helix nebula 45 constellation Cassiopeia 45 satellites orbiting 45 planetary embryos 45 iridium layer 45 HiRISE image 45 ultraviolet imaging spectrograph 45 God Particle 45 highly elliptical orbits 45 ESA SMART 45 Endurance crater 45 shimmering rings 45 Mpc 45 lunar surface 45 extraterrestial 45 Gerasimos Papadopoulos 45 Jupiter Icy Moons 45 planets circling stars 45 Spirit rover 45 Peony nebula star 45 extrasolar 45 Ozone Hole 45 geologically active 45 KH #D 45 brightest meteors 45 Super Earths 45 constellation Cetus 45 Lyrids 45 unpiloted 45 asteroid collides 45 colder denser 45 fiery reentry 45 planet transits 45 Terrestrial Planet Finder 45 exo planet 45 X ray spectrometer 45 Olympus Mons 45 gibbous moon 45 comet flyby 45 interferometric synthetic aperture radar 45 SMM J# 45 orbit GEO 45 gamma ray burst 45 massless particles 45 Hyades cluster 45 Tropical Storm Neki 45 GeV 45 Interior Laboratory GRAIL 45 XTE J# 45 highly magnetized neutron 45 Maria Zuber 45 Craig dePolo research 45 aboard ESA Envisat 45 galactic equator 45 Enceladus flybys 45 superheavy elements 45 elliptical galaxy 45 Sakurajima 45 astrobiological 45 northern arctic plains 45 Perseus constellation 45 Einstein relativity theory 45 ESA Herschel 45 spaceport Sriharikota 45 Orionid meteors 45 Extrasolar planets 45 Cygnus X 45 oblate spheroid 45 antineutrinos 45 Magellanic Stream 45 Soyuz rocket carrying 45 galaxy redshift 45 mosque minaret taller 45 gamma ray flares 45 X ray telescopes 45 Rosetta orbiter 45 Lulin 45 -# degrees centigrade [001] 45 Geminid meteor shower 44 moon 44 WISE infrared 44 Lyrid meteor shower 44 shadowed crater 44 microlensing 44 Impact Probe MIP 44 Sarychev Peak 44 NASA Wilkinson Microwave