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(Click for frequent words.) 67 lunar 64 lunar surface 61 waning gibbous 60 Mars 59 waxing gibbous 58 manned lunar landing 57 outer space 57 lunar landing 57 Moon 57 moon bahn kee 57 moons 56 Red Planet 56 waxing crescent 56 waning crescent 56 Predator drone flies 56 Saturnian moon Titan 55 gibbous 55 Jovian moons 55 thin crescent 55 super perigee moon 55 planet Uranus 55 Edwin Aldrin 55 comet 54 Saturn Cassini 54 gibbous moon 54 lunar landers 54 Manned missions 54 SKY WATCH 54 manned lunar 54 slender crescent 54 Martian surface 54 astronaut Eugene Cernan 54 rover Opportunity 54 Korea Bae Sang 53 Comet Lulin 53 Charon Pluto 53 spacecraft 53 waning gibbous moon 53 Today waxing Virgo 53 lunar perigee 53 Iapetus Saturn 53 mission Chandrayaan 53 waxing gibbous moon 52 brightest meteors 52 Nasa 52 asteroid Vesta 52 asteroid 52 NASA LCROSS 52 Saturn moon 52 Comet Machholz 52 orbit 52 Solar Dynamics Observatory 52 unmanned lunar 52 ringed planet 52 penumbral shadow 52 Orionids 52 Jupiter Ganymede 52 cometary debris 52 robotic explorer 52 Lunar Reconnaissance Orbiter LRO 52 comets asteroids 52 unmanned rover 52 unmanned lunar orbiter 51 Shackleton crater 51 cosmos 51 spaceship 51 Halley Comet 51 spacecraft Cassini 51 waitress Ingrid Sufan 51 robotic rovers 51 Nasa spacecraft 51 permanently shadowed craters 51 Earth 51 orbiting 51 Earthlike planets 51 martian 51 innermost planet 51 tow dollies 51 Cassini Huygens spacecraft 51 crewed spacecraft 51 lunar equator 51 uncontrollable gusher 51 comet Hale Bopp 51 lunar module Eagle 50 Voyager spacecraft 50 Comet Hartley 2 50 Gusev crater 50 Sensing Satellite LCROSS 50 planet 50 Eta Aquarid meteor shower 50 gaseous planet 50 Hale Bopp comet 50 Fomalhaut b 50 Gene Cernan 50 Mars moon Phobos 50 COROT 50 Earth orbit 50 asteroid Itokawa 50 Opportunity rover 50 Epsilon Aurigae 50 Martian rovers 50 Cosmonaut Yuri Gagarin 50 asteroid Eros 50 astronaut Gene Cernan 50 Saturn Enceladus 50 Cassini Huygens 50 waning crescent Moon 50 rover 50 Upsilon Andromedae 50 Martian arctic plains 50 celestial 50 Corot 7b 50 Deep Impact comet 50 Shenzhou VI capsule 50 Zeta Ophiuchi 50 spacecraft orbited 50 twin Voyager spacecraft 50 LADEE 49 Martian 49 Martian rover 49 mission Chandrayan 49 unmanned probes 49 planetary explorations 49 Epsilon Eridani 49 Curiosity rover 49 spaceships 49 Stardust spacecraft 49 sky 49 asteroids 49 Churyumov Gerasimenko 49 heavily cratered 49 celestial sphere 49 manned spacecraft 49 lunar exploration 49 extrasolar 49 orb 49 Chang'eI 49 Apollo missions 49 permanently shadowed crater 49 comet Lulin 49 Comet #P/Churyumov-Gerasimenko 49 spacecraft Chandrayaan 1 49 moon Titan 49 shadowy craters 49 orbiter 49 Comet Halley 49 Galileo spacecraft 49 Lunokhod 49 celestial bodies 49 Upsilon Andromedae b 49 Lunar Exploration 49 Ra Kyung min 49 HD #b [001] 49 Fra Mauro 49 wolf howling 49 NASA MESSENGER spacecraft 49 unmanned spacecraft 49 irregularly shaped asteroid 48 cosmological distances 48 lunar maria 48 planets 48 polar craters 48 Jupiter Uranus 48 Venusian 48 Comet Churyumov Gerasimenko 48 lunar crater 48 retrograde orbit 48 outer planets 48 Pleiades star 48 Saturnian 48 highly elliptical orbits 48 Suh Sung 48 Martian terrain 48 Lulin 48 rover Spirit 48 comet nucleus 48 Mandushev 48 Jovian moon 48 NASA 48 Uranus Jupiter 48 zodiacal light 48 lunar rover 48 Lunar eclipse 48 Clementine spacecraft 48 Gliese #c 48 crescent Moon 48 robotic rover 48 Martian equator 48 lunar orbiter 48 Wolszczan 48 lunar soil 48 Paul Spudis principal 48 Mars rover 48 SIRTF 48 Pha ngan island 48 lander 48 Geminids meteor shower 48 lunar crust 48 Halley comet 48 Pleiades cluster 48 moonwalker 48 Eagle lunar lander 48 NASA Mars rover 48 Mars rovers Spirit 48 orbiting Hubble Space Telescope 48 comets 48 Foing 48 lunar orbiter Chang'e 48 Saturnian moon 48 Saturn moons 48 Leonid meteor shower 48 Cassini 48 comet flyby 48 robotic landers 48 constellation Carina 47 spacecrafts 47 BepiColombo 47 Quadrantid meteor shower 47 Martian crater 47 Saturn moon Iapetus 47 robotic spacecraft 47 magnificent desolation 47 Explorer WISE 47 perigee moon 47 Jupiter Icy Moons 47 arctic plains 47 Messenger spacecraft 47 lunar poles 47 star Spica 47 rovers 47 occulted 47 Saturn rings 47 Orionid meteor shower 47 Martian lander 47 galaxy M# [001] 47 synchronous orbit 47 manned lunar missions 47 robotic explorers 47 lunar landings 47 Geminid meteor shower 47 moons circling 47 lunar orbit 47 planets Uranus 47 NASA rovers Spirit 47 MESSENGER 47 exoplanetary 47 Huygens lander 47 Solar TErrestrial RElations Observatory 47 supermoon 47 Cernan 47 Comet Hartley 47 spacecraft orbiting 47 STEREO spacecraft 47 Jupiter moons 47 AU Mic 47 Earthlike planet 47 planets orbiting distant 47 Chandrayaan II 47 Comet Tempel 1 47 GJ#b 47 Saturn outermost moon 47 Orbiter LRO 47 WISE telescope 47 COROT 7b 47 Shenzhou V 47 noctilucent clouds 47 Cassini flyby 47 Yinghuo 1 47 coronal loops 47 planetary Transits 47 NASA STEREO 47 planetary alignments 47 LCROSS mission 47 Soviet cosmonaut Yuri Gagarin 47 geostationary orbits 47 Tranquillity Base 47 permanently shadowed regions 47 waxing crescent moon 47 comets orbiting 47 Mercury Uranus 47 moon Io 46 reentry capsule 46 Opportunity parachuted 46 NASA Stardust spacecraft 46 Uranus 46 moons Phobos 46 Kepler spacecraft 46 Hale Bopp 46 spaceward 46 Hubble Space 46 waxing moon 46 Kaguya probe 46 transiting exoplanet 46 Hayabusa spacecraft 46 Comet NEAT 46 Helix nebula 46 orbiters 46 Ed Weiler NASA 46 Amateur astronomers 46 equinox 46 scientist Greg Delory 46 telescope 46 moon Buzz Aldrin 46 Sojourner rover 46 thin crescent moon 46 comet Tempel Tuttle 46 rovers Spirit 46 circumlunar 46 SIM PlanetQuest 46 Saturnian moons 46 occultations 46 autumn equinox 46 Ulysses spacecraft 46 colonize Mars 46 infrared telescopes 46 Fermi telescope 46 penumbral lunar eclipse 46 lunar craters 46 MESSENGER spacecraft 46 robot rovers 46 Tranquility Base 46 Shackleton Crater 46 GJ #b [002] 46 NASAs 46 telescopic observations 46 Mars Odyssey spacecraft 46 Perseid meteor shower 46 penumbral eclipse 46 Perseids meteor shower 46 Ranging spacecraft 46 Ringed Planet 46 martian surface 46 Comet Hale Bopp 46 Shenzhou VII 46 taikonaut 46 Jupiter icy moons 46 Kepler 9c 46 SpaceWeather.com 46 Mercury flyby 46 Planck telescope 46 Kuiper Belt object 46 Mars Reconnaissance Orbiter MRO 46 Cosmic Microwave Background 46 comets meteors 46 Taurus Littrow Valley 46 lunar eclipse 46 Lyrid meteor shower 46 planetoid 46 exoplanets planets 46 ESA Huygens probe 46 orbital rendezvous 46 NASA Cassini spacecraft 46 Project Ozma 46 comet Churyumov Gerasimenko 46 orbiting telescope 46 New Horizons spacecraft 46 twin rover Spirit 46 Jupiter Saturn 46 NASA twin rovers 46 orbiter lander 46 Mars Exploration 46 celestial object 46 lunar occultation 46 constellation Aquarius 46 hubble 46 geo stationary orbit 46 protoplanet 46 moonbase 46 Galilean satellites 45 NASA Kepler telescope 45 extrasolar planet 45 retroreflector 45 moon Canup 45 lunar missions 45 Lunar Prospector 45 Huygens spacecraft 45 Victoria Crater 45 Kuiper Belt Objects 45 Herschel telescope 45 Relations Observatory STEREO 45 icy moons 45 exo planets 45 tidal bulge 45 twin rover Opportunity 45 IBEX spacecraft 45 Martian landscape 45 Venusian surface 45 earth 45 Winter solstice 45 Eta Aquarids 45 Kepler #b 45 Hubble Space Telescope 45 Cryosat 45 Itokawa 45 Kepler Space Telescope 45 S/# S1 45 lunar crescent 45 outerspace 45 GJ #b [001] 45 #P/Churyumov-Gerasimenko 45 cosmic cannibal 45 Galilean moons 45 Diviner 45 Meteor shower 45 International Space Station 45 earthshine 45 probe Huygens 45 Earth asteroid Itokawa 45 constellation Leo 45 Stardust capsule 45 stationary lander 45 NASA Lunar Reconnaissance 45 Hubble telescope 45 Mars landers 45 Oort Cloud 45 Shuttle Endeavor 45 Quadrantids 45 robotic probes 45 exo planet 45 Diviner instrument 45 Aries Taurus 45 OSIRIS REx 45 Mars Pathfinder 45 orbiting Cassini spacecraft 45 Mars Odyssey orbiter 45 moon Phobos 45 Comet Holmes 45 umbral shadow 45 Itokawa asteroid 45 Voyager probes 45 Taurus Littrow 45 spacecraft flyby 45 constellation Virgo 45 extrasolar planets 45 Mars Reconnaissance Orbiter 45 Cassini spacecraft 45 Comet Elenin 45 Isidis Planitia 45 starlight 45 Apollo lunar 45 Nasa Deep Impact 45 vernal equinox 45 lunar probe 45 constellation Ophiuchus 45 aurorae 45 skywatching 45 constellation Cygnus 45 interplanetary spacecraft 45 meteor 45 simulated lunar 45 Lunar Orbiter 45 NASA Deep Impact 45 Comet Boethin 45 celestial phenomena 45 shadowed craters 45 Mars rover Opportunity 45 constellation Perseus 45 Cassini Equinox 45 Solar System 44 Mars Rover 44 # Apophis 44 extrasolar planets orbiting 44 Europa Orbiter 44 asteroid Steins 44 manned missions 44 celestial equator 44 Pluto 44 meteoroid 44 moonrise 44 Lunar Module Pilot 44 exosphere 44 icy comets 44 Earthlike 44 Huygens probe 44 asteroids comets 44 orbiting spacecraft 44 moon Charon 44 perihelion 44 lunar orbiters 44 orbiting Kepler telescope 44 Opportunity Mars rover 44 HD #b [002] 44 WISE spacecraft 44 martian landscape 44 starless sky 44 lunar regolith 44 flyby spacecraft 44 planet Gliese #g 44 Astronaut Randolph Bresnik 44 planets moons 44 Caloris Basin 44 flyby 44 comet Tempel 1 44 gravitational keyhole 44 Yury Gagarin 44 Kepler Telescope 44 aboard Taurus XL 44 Mars Uranus 44 Ring Nebula 44 space shuttle 44 lunar orbits 44 EVA extravehicular activity 44 Phobos Grunt 44 GEochemistry 44 cosmic 44 Orion constellation 44 STSS Demo 44 orbiting observatories 44 Hadley Rille 44 mu Arae 44 astronauts 44 Toutatis 44 comet hurtling 44 lunar lander 44 NASA Spirit rover 44 Galaxy Evolution 44 Lunar CRater Observation 44 interplanetary probes 44 planets orbits 44 constellation Hercules 44 Proxima Centauri 44 Comet McNaught 44 rover Curiosity 44 landers 44 moons orbiting 44 Saturn moon Mimas 44 periodic dimming 44 exoplanet orbiting 44 cometary 44 probe Chang'e 44 Rosetta spacecraft 44 Martian soil 44 Saturnian system 44 Solar Terrestrial Relations 44 Huygens mission 44 Astronaut Eugene Cernan 44 Jupiter moons Europa 44 origins spectrograph 44 moons orbiting Saturn 44 zodiac constellations 44 inter planetary 44 manned lunar mission 44 X ray observatory 44 Perseus constellation 44 Shenzhou VI spacecraft 44 Perseid shower 44 Field Infrared Survey 44 MARSIS radar 44 Mars Squyres 44 Planetary Society 44 fainter meteors 44 Mars rovers 44 Pluto Charon 44 David Southwood ESA 44 Samuel Oschin Telescope 44 Astronomically speaking 44 Mars lander 44 Squyres Cornell 44 zodiacal constellations 44 Viking orbiters 44 astronomical observatories 44 magma ocean 44 field Infrared Survey 44 Orientale Basin 44 rover Spirit landed 44 JIMO 44 Martian dust 44 NASA rover Spirit 44 Perseid Meteor Shower 44 sunward 44 Neptune Jupiter 44 planets circling stars 44 Ouyang Ziyuan 44 infrared telescope 44 solar eclipse 44 celestial fireworks 44 comet chaser 44 constellation Eridanus 44 Geminid meteors 44 LCROSS 44 Terrestrial Planet Finder 44 polar regions 44 gravitational tides 44 Apollo 44 lander rover 44 curing paralysis 44 Mars orbiter 44 human spaceflight 44 constellation Cassiopeia 44 smallest exoplanet 44 telescope eyepiece 44 meteoroids 44 Orbiter MRO 44 Geza Gyuk 44 Viking landers 44 comet particles 44 celestial observations 44 sky darkens 44 Grammier 44 KH #D 44 Martian moon Phobos 44 jovian 44 Titan Saturn 44 Leonid meteor showers 44 aphelion 44 Nasa Mars Reconnaissance 44 Spudis 44 Shepherding Spacecraft 44 Kuiper belt object 44 moon gravitational pull 44 sextile 44 moon Ganymede 43 Lt. Col. Yang Liwei 43 crater rim 43 twin rovers Spirit 43 Huygens descent 43 Shenzhou spacecraft 43 meteor fireball 43 Space Shuttle Discovery 43 Leonids meteor shower 43 A. Cernan 43 NASA MESSENGER 43 COROT exo 3b 43 Meridiani plains 43 adorable orphan 43 moon landings 43 closest flyby 43 lunar module pilot 43 moon Europa 43 outer corona 43 Nasa Jet Propulsion 43 Hubble 43 orbited Jupiter 43 Deep Impact spacecraft 43 Russian cosmonaut Yuri Gagarin 43 BepiColombo mission 43 Apollo astronauts 43 cosmic ray 43 ray Space Telescope 43 shinin 43 P/# A2 43 smoggy atmosphere 43 Cepheid variables 43 constellation Auriga 43 alien spaceship 43 planet WASP #b 43 HiRISE camera aboard 43 Viking Orbiter 43 SuperMoon 43 elliptical orbit 43 NEAs 43 planetary exploration 43 Observatory SDO 43 trans Neptunian objects 43 Emily Lakdawalla 43 planets orbiting sun 43 CoRoT 9b 43 Cydonia region 43 Apollo lunar landings 43 observable universe 43 Venusian atmosphere 43 icy moon Enceladus 43 Hubble Telescope 43 NASA Cassini 43 LCROSS spacecraft 43 Meridiani Planum 43 highly elliptical orbit 43 Deep Impact probe 43 Saturn Jupiter Uranus 43 Olympus Mons 43 Asteroid Belt 43 Gedmark 43 Nasa Mars Odyssey 43 Carina constellation 43 Leonid meteors 43 orbiting observatory 43 planet Nibiru 43 mooncraft 43 WASP #b 43 Kepler telescope 43 celestial phenomenon 43 astronomers 43 flyby Cassini 43 waning crescent moon 43 Andromeda galaxy 43 planetary nebulas 43 manned spacecraft Shenzhou VI 43 Shuttle Discovery blasts 43 six wheeled rover 43 faraway planets 43 Lunar Reconnaissance Orbiter 43 Comet 9P/Tempel 1 43 Hellas Basin 43 Bug Nebula 43 celestial objects 43 landscape songbirds chirped 43 Impact Probe MIP 43 constellation Scorpius 43 Taurids 43 lander Philae 43 Shawal moon 43 NASA rovers 43 Orionid 43 interstellar space 43 Manhattanhenge 43 Shenzhou VII mission 43 Jean Pierre Lebreton 43 commander Dmitry Kondratyev 43 preset orbit 43 Lunar Rover 43 GLAST telescope 43 Ralph McNutt 43 Foton M3 43 sols 43 Gerhard Schwehm 43 moonless night 43 rocky extrasolar planet 43 Uranus Neptune 43 Hinode 43 spokesman Michael Braukus 43 crescent moon 43 planet HD#b 43 Stardust NExT 43 NASA Voyager spacecraft 43 asteroid collisions 43 constellation Orion 43 Swift Tuttle 43 gravity warps 43 axial tilt 43 lunar outpost 43 Hubble Space Telescope HST 43 perigee 43 cosmic microwave background 43 Chandrayaan 43 NASA Kepler 43 Shenzhou VI 43 exosolar planets 43 Spaceguard 43 Chandrayan 43 asteroidal 43 Endeavour Crater 43 buckypaper virtually 43 HiRISE camera 43 Revelers ringing 43 Kraken Mare 43 Bonneville Crater 43 inhabitable planets 43 circumlunar satellite 43 lunar rovers 43 ESA Rosetta 43 spacecraft Chandrayaan 43 OSIRIS Rex 43 Kepler observatory 43 Ed Weiler 43 Sojourner Rover 43 astronomy 43 interplanetary 43 Mars Pathfinder lander 43 NASA rover Opportunity 43 heavens 43 Martian polar 43 sun 43 magnetotail 43 Geminids 43 Space Administration CNSA 43 orbits 43 axions 43 asteroid Lutetia 43 Deep Impact craft 43 HiRISE image 43 Comet Encke 43 spacefaring civilization 43 spacewoman 43 meteor shower 43 Oceanus Procellarum 43 galaxy M# [002] 43 NASA Opportunity rover 43 THEMIS satellites 43 red supergiant 43 ExoMars rover 43 Sky gazers 43 Martian moons Phobos 43 Epimetheus 43 planetary 43 winged spacecraft 43 aboard Soyuz spacecraft 42 MAVEN 42 Fomalhaut 42 Huygens Probe 42 Solar Orbiter 42 Pancam 42 HiRISE 42 STEREO mission 42 Giovanni Cassini 42 Paul Spudis 42 Planck satellite 42 terraforming Mars 42 Phangan Island 42 Capricornus 42 ESA Huygens 42 moon Schirra 42 airglow 42 Titan flyby 42 Lightning flickered 42 Atlantis undocks 42 Tempel 1 42 astronaut 42 moon Mab 42 ESA Mars 42 spring equinox 42 Saturn moon Enceladus 42 Mars Phobos 42 WD5 42 permanently shadowed 42 EPOXI 42 Lunar Excursion Module 42 Delta Cephei 42 Gerard Kuiper 42 constellation Centaurus 42 Lunar Roving Vehicle 42 Mercury Gemini 42 Dynamics Observatory 42 Great Observatories 42 shuttle Endeavor 42 moonlight 42 Huygens 42 William Irace 42 polar orbit 42 entered lunar orbit 42 barren moonscape 42 exoplanets 42 habitable planets 42 Uranian 42 Meteor showers 42 onboard Chandrayaan 42 Shenzhou VII spacecraft 42 manned Shenzhou 42 WMAP satellite 42 NASA Lunar Prospector 42 interstellar particles 42 classical antiquity 42 satellites orbiting Earth 42 Muchachos Observatory 42 shaded craters 42 comets moons 42 Betelgeuse 42 Noctilucent clouds 42 Crab Nebula 42 C1XS 42 northern arctic plains 42 N. Rathnasree 42 moonquakes 42 twin Mars rovers 42 orbital resonance 42 comet Hartley 2 42 orbital eccentricity 42 Sharad Purnima 42 Saturn magnetosphere 42 hydroxyl molecules 42 habitable worlds 42 coyote howling 42 thrilling stargazers 42 asteroids Ceres 42 solar corona 42 Aurigid 42 heliopause 42 amateur skywatchers 42 ecliptic plane 42 antarctic 42 meteoroid impacts 42 galaxy 42 MARSIS 42 Mars orbiters 42 Martian arctic 42 sundog 42 distant galaxies 42 partial lunar eclipse 42 NuSTAR 42 Titan smoggy 42 scarps 42 James Fanson 42 Saturn equinox 42 Space Shuttle Endeavor 42 orbited Earth 42 OGLE TR #b 42 albedo reflectivity 42 TrES 4 42 LORRI 42 Phoebe orbits 42 Valles Marineris canyon 42 smoothest flattest spot 42 Saturn moons Titan 42 satellite Sputnik 42 KAGUYA 42 Martian plains 42 circular orbit 42 Cerro Pachon 42 stargazer 42 distant suns 42 called gray hematite 42 CoRoT satellite 42 Gusev Crater 42 NASA Mars Reconnaissance 42 impactor spacecraft 42 ESA Planck 42 Lunar Crater 42 Extrasolar planets 42 Valentina Tereshkova 42 astronomer 42 astronomer Clyde Tombaugh 42 Perseid meteor showers 42 faraway galaxies 42 lunar spacecraft 42 robotic rover Spirit 42 Neptune Uranus 42 astrometry 42 predawn sky 42 moonwalkers 42 enters lunar orbit 42 sunlike star 42 meteorite bombardment 42 G Madhavan Nair 42 EPOXI mission 42 moonwalker Buzz Aldrin 42 Jacque Fresco 42 asteroids orbiting 42 crewed missions 42 Bernhard Fleck 42 Space ENvironment GEochemistry 42 Horizons spacecraft 42 intergalactic spaceship 42 NASA THEMIS 42 orbiting Mars 42 Pluto Kuiper Belt 42 rocket scientist Wernher 42 brightest supernova 42 PSLV C 42 GALEX 42 Earth asteroids 42 X ray telescopes 42 rover Sojourner 42 RQ# 42 Mars Gusev Crater 42 annular eclipse 42 YU# 42 manned lunar landings 42 comet dust 42 Saturn 42 Omega Centauri 42 distant supernovae 42 assumed planets circling 42 photosphere 42 aboard Skylab 42 cosmic magnifying glass 42 HD#b 42 Cosmic Background Explorer 42 Helios 2B 42 Bill Borucki Kepler 42 spacefaring 42 constellation Ursa Major 42 Discovery undocked 42 Orion nebula 42 Cassini Huygens Mission 42 Kuiper belt 42 nasa.gov 42 exoplanets orbiting 42 Rick Grammier 42 lunar highlands 42 Spaceguard Survey 42 look distractingly cartoony 42 distant galaxy 42 BLG #Lb 42 auroral emissions 42 BP Psc 42 infrared observatory 42 sidereal 42 exhaust plume 42 Leonids 42 Nibiru 42 interplanetary missions 42 galactic alignment 42 IceCube 41 ESA GOCE 41 Eridanus 41 flying saucers 41 BP Piscium 41 planets comets 41 astronaut Yuri Gagarin 41 Lutetia 41 constellation Vulpecula 41 Io Europa 41 lunar expeditions 41 olivine mineral 41 constellations planets 41 Lunar eclipses 41 orbital insertion 41 Andromeda Galaxy 41 lunar explorers 41 Convection Rotation