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(Click for frequent words.) 63 demote Pluto 61 dwarf planet 59 Kuiper Belt Object 57 plutoid 57 Corot 7b 56 Kuiper Belt object 56 demoting Pluto 56 trans Neptunian objects 55 plutoids 55 Pluto Eris 54 Pluto dwarf 54 dwarf planets 54 outermost planet 54 Pluto demotion 53 Clyde Tombaugh discovered 53 Pluto 53 Makemake 52 Gliese #c 52 rocky extrasolar planet 52 S/# P2 52 International Astronomical 52 UB# [003] 52 Gliese #g 52 planethood 51 Upsilon Andromedae 51 Owen Gingerich 51 BLG #Lb 51 Uranus Neptune 51 exoplanet orbiting 51 Fashion Movie Reviews 51 Small Body Nomenclature 51 Kuiper belt object 51 COROT 7b 50 spiral nebulae 50 Kepler #b 50 comets meteors 50 Omega Centauri 50 Union IAU 50 moons Phobos 50 asteroid Ceres 50 planetary Transits 50 SIOUX CENTER Iowa KTIV 50 Kuiper Belt Objects 50 gory spectacles 50 CoRoT #b 49 Pluto Charon 49 Tycho Brahe 49 largest moon Charon 49 Upsilon Andromedae b 49 Voorwerp 48 comets orbiting 48 assumed planets circling 48 Follett Pillars 48 retrograde orbit 48 protoplanet 48 circumstellar disks 48 GJ #b [001] 48 Pluto planetary status 48 Bug Nebula 48 Gliese #G 48 Fomalhaut b 48 inhabitable planets 48 nicknamed Xena 48 exo planet 48 smallest exoplanet 48 gravitationally bound 48 OGLE TR #b 48 Cosmic Microwave Background 48 IRAS 4B 48 BLG #L 48 Gerard Kuiper 48 XO 3b 48 hydrostatic equilibrium 48 retrograde orbits 48 HIP #b 48 galaxy M# [001] 48 Fritz Zwicky 48 coronal loops 48 heliocentric 47 planetary astronomer 47 Kuiper belt objects 47 meek inheriting 47 astronomers 47 Tunguska meteorite 47 Martians invading 47 CoRoT 7b 47 zodiac constellations 47 IBM logo ibm.com 47 Chicxulub 47 Comet Halley 47 astronomer Clyde Tombaugh 47 Pluto planethood 47 mu Arae 47 When Dinosaurs Ruled 47 Edmond Halley 47 oblate spheroid 47 gravitational tides 47 Phaethon 47 Neptune Uranus 47 Saturn Uranus 47 moons orbiting 47 IRC +# 47 planetoid 47 Galileo telescope 47 lensing galaxy 46 Lagoon Nebula 46 boson 46 equatorial bulge 46 sundog 46 Peony nebula star 46 dustier stormier atmosphere 46 found circling Gliese 46 Dwarf Planet 46 Halley comet 46 cosmic phenomena 46 occulted 46 gaseous planet 46 Toutatis 46 RY Sagittarii 46 asteroids comets 46 dwarf planets exist 46 Quadrantids 46 HD #b [002] 46 twin STEREO spacecraft 46 WASP #b 46 Hollywood dreck Battlefield 46 Clyde Tombaugh 46 VY Canis Majoris 46 stony meteorites 46 baryonic 46 Inuit goddess 46 AU Mic 46 barred spiral galaxy 46 carbonaceous chondrite 46 P/# A2 46 Galilean moons 46 Oort Cloud 46 IAU 46 whiz harmlessly 46 discover Fomalhaut 46 CoRoT 9b 46 planets orbiting sun 46 GQ Lupi 46 Earthlike 46 planet orbiting 46 planetoids 46 moons circling 46 planetary nebulas 45 Epsilon Aurigae 45 heliocentric theory 45 astronomer Percival Lowell 45 Magnetars 45 Beta Pictoris 45 planet Uranus 45 planets comets 45 Quaoar 45 comet hurtling 45 Hipparchus 45 Torino Scale 45 KT extinction 45 Galilean satellites 45 TrES 4 45 mere speck 45 supermassive 45 millisecond pulsar 45 exoplanets planets 45 Charon Pluto 45 Oort cloud 45 moon Io 45 Comet Holmes 45 earthlike 45 spacecraft flyby 45 Fermi paradox 45 Exoplanets 45 globular cluster M# 45 astronomer Johannes Kepler 45 ESA Herschel 45 Extrasolar 45 hunting Kepler telescope 45 QQ# 45 planets asteroids 45 distant quasar 45 gravitational tugs 45 terraforming Mars 45 Giovanni Cassini 44 Hadean 44 Maunder minimum 44 SN #A 44 Cancri e 44 Haumea 44 exoplanets orbiting 44 planets circling stars 44 Saturn Cassini 44 celestial mechanics 44 novas 44 Trifid 44 binary quasar 44 Solar Dynamics Observatory 44 telescopic observations 44 puny Pluto 44 Nicolaus Copernicus 44 icy moons 44 Kepler 9c 44 SN #C 44 Proxima Centauri 44 GJ#b 44 Pluto planetary 44 asteroid collisions 44 IAU definition 44 habitable planet 44 extrasolar planetary systems 44 planets orbiting distant 44 Astronaut Randolph Bresnik 44 exosphere 44 Jupiter gravitational pull 44 moon gravitational pull 44 Project Ozma 44 Ring Nebula 44 Saturn Enceladus 44 Kuiper belt 44 extrasolar 44 cosmological distances 44 authors Anne Verbiscer 44 Martian meteorites 44 planet 44 planetary nebula 44 Della Moen 44 BP Psc 44 planet Gliese #g 44 Iapetus Saturn 44 superstrings 44 Nibiru 44 transiting exoplanet 44 Triangulum 43 KBOs 43 Ian McShane Pillars 43 brightest supernova 43 Comet Hale Bopp 43 jovian 43 Rayleigh scattering 43 Helix nebula 43 Red Rectangle 43 gravitational perturbations 43 Hellas Basin 43 planets orbits 43 Zeta Ophiuchi 43 planetary 43 constellation Ophiuchus 43 look distractingly cartoony 43 Astrophysical Institute 43 outermost planets 43 rotating neutron 43 Venus Neptune Uranus 43 Jupiter moons 43 Manned missions 43 astrophysicists 43 planets Uranus 43 lunar maria 43 proto cluster 43 Kuiper Belt objects 43 celestial object 43 Mandushev 43 asteroids orbiting 43 Wiccans worship 43 BepiColombo 43 starburst galaxy 43 Stephan Quintet 43 Saturnian moon Titan 43 lunar craters 43 Herbig Ae Be 43 greatest insect emergences 43 cosmic cannibal 43 Gliese #e 43 Avishay Gal Yam 43 self proclaimed baddest 43 Epimetheus 43 volcano Olympus Mons 43 Jovian moon 43 lunar meteorite 43 amateur skywatchers 43 inch refracting telescope 43 cosmic 43 Pan STARRS PS1 telescope 43 heliocentric model 43 nebula NGC 43 planemos 43 WebSphere SmartSOA Smarter Planet 43 lunar soil 43 Neil DeGrasse Tyson 43 orbited Jupiter 43 rare wekiu bug 43 SNR #-#.# 43 axial tilt 43 Schrödinger cat 43 asteroid 43 Henize #-# 43 dimming starlight 43 VB #b 43 stunningly beautiful landscapes 43 HD#b 43 Kaguya probe 43 Jupiter icy moons 43 ALH# 43 Mojoceratops 43 protoplanetary 43 Uranus Jupiter 43 Geminga 43 La Silla observatory 43 Astrological lore 43 Cuvilly Arts 43 astrobiological 43 interstellar dust 43 theoretical physicist Stephen Hawking 43 constellation Pegasus 43 transiting planet 43 Hot Jupiters 43 Arecibo radar 43 silicon monoxide 43 Videsh Heaven 42 May Peace Prevail 42 moondust 42 Coma cluster 42 Martian moons Phobos 42 orbiting Kepler telescope 42 dangerously overheat 42 Hale Bopp comet 42 eclipsing binary 42 galaxy M# [002] 42 launched Operation Scorched 42 sterile neutrinos 42 #gy 42 Rosette Nebula 42 dirty snowballs 42 species Homo floresiensis 42 constellation Lacerta 42 nightglow 42 WMAP satellite 42 Pieter van Dokkum 42 planets 42 beachball sized 42 lobate scarps 42 sunlike stars 42 shadow biosphere 42 Goldilocks planet 42 Harlow Shapley 42 Higgs bosons 42 Saturn Uranus Neptune 42 PSR B# +# 42 Sedna 42 interplanetary dust 42 Richard Binzel 42 Fermi telescope 42 Dava Sobel 42 comets asteroids 42 Darwinius masillae 42 infall 42 OGLE TR 42 trans Neptunian 42 Hanny Voorwerp 42 Elenin 42 icy comets 42 plutons 42 orbital resonance 42 orbited 42 Wolf Rayet star 42 Planck satellite 42 Venetia Phair 42 Churyumov Gerasimenko 42 celestial 42 lunar meteorites 42 planet HD #b 42 microquasar 42 Neutron stars 42 terraformed 42 moon Ganymede 42 astronomer Galileo Galilei 42 galactic 42 BP Piscium 42 HL Tau 42 radial velocity technique 42 MErcury Surface Space ENvironment 42 Mercury magnetosphere 42 Cepheid variables 42 Convection Rotation 42 TW Hydrae 42 GALEX 42 dust enshrouded 42 planets orbiting stars 42 COROT exo 3b 42 Martian dust 42 Sara Seager 42 chemical abundances 42 extrasolar planet 42 Phoebe orbits 42 twin suns 42 Neptune Jupiter 42 V# Mon 42 outer planets 42 exoplanetary 42 James Lovelock 42 Epsilon Eridani 42 cometary material 42 Asteroid Belt 42 Kangaroo Rats 42 moon Charon 42 HAT P 42 Wide Angle Search 42 magma ocean 42 NGC #A 42 constellation Carina 42 nebular 42 Omega Nebula 41 planetary alignments 41 Exoplanet 41 luminosities 41 orbiting 41 Hyakutake 41 Gliese #d 41 albino dinosaur 41 WISE telescope 41 accretion disks 41 volcanic moon Io 41 called gravitational microlensing 41 exoplanet hunter 41 Dumbbell Nebula 41 Butterfly Nebula 41 reentry capsule 41 WISE spacecraft 41 SIM PlanetQuest 41 Cabeus crater 41 Fred Hoyle 41 limbo Len Gengel 41 moons 41 interplanetary spacecraft 41 exoplanet 41 PSR J# 41 Laurasia 41 Sasselov 41 Earth 41 Robert Jedicke 41 Mysteries abound 41 extrasolar planets orbiting 41 supergiant stars 41 asteroidal 41 Himiko 41 SN #gy 41 Venusian 41 Jovian moons 41 Tau Ceti 41 Titan smoggy 41 Solar TErrestrial RElations Observatory 41 exo planets 41 Alexander Kashlinsky 41 SN #D 41 God Particle 41 distant galaxy 41 Dominique Cassini 41 Gaia Theory 41 red supergiant 41 vestigial organs 41 Muons 41 Voyager spacecraft flew 41 CMB radiation 41 Mars Uranus 41 protoplanetary disks 41 comet Hale Bopp 41 particle smasher 41 potentially habitable 41 strange quark 41 Neptunian 41 GJ #b [002] 41 Relations Observatory STEREO 41 Hesperian Epoch 41 sunlike star 41 cometary impacts 41 RQ# 41 Cosmic Microwave Background CMB 41 supervolcanoes 41 CoRoT 41 Olympus Mons 41 orbiting Cassini spacecraft 41 Asteroid Apophis 41 Uranian 41 magnetar 41 moonwalker 41 redshifted 41 faraway galaxy 41 Anthropocene 41 Goldilocks zone 41 Milky Way halo 41 Kepler discoveries 41 Nicholas Copernicus 41 Giovanni Schiaparelli 41 Planetary scientists 41 planet WASP #b 41 S/# [001] 41 NGC# 41 blackholes 41 Neil deGrasse Tyson 41 orbital inclination 41 Pluto moon Charon 41 spiral galaxy Messier 41 asteroid Apophis 41 planet Nibiru 41 Phobos Grunt 41 sized planets orbiting 41 XMM Newton satellite 41 carbonaceous chondrites 41 exobiology 41 mysterious uncharted 41 neutralinos 41 Terrestrial Planet Finder 41 Habitable 41 Antarctic icecap 41 periodic dimming 41 planets moons 41 magnetars 41 Einsteinian 41 galactic alignment 41 R Coronae Borealis 41 geological epoch 41 meteorite 41 Percival Lowell 41 smallest exoplanets 41 dynamical evolution 41 Orion nebula 41 Keck telescope 41 abiogenesis 41 waning crescent Moon 41 baryon 41 Tyurin novice 41 biospheric 41 Ontario Lacus 41 AGNs 41 airglow 41 constellation Eridanus 40 supernova explosion 40 Norrin Radd 40 Mayan prophecies 40 hadron 40 Svensmark 40 silicate mantle 40 Starz Pillars 40 planetary astronomy 40 orbital eccentricity 40 Milankovitch 40 HD# [002] 40 planet transits 40 Saturnian 40 Sciences Shri Kapil 40 Voyager spacecraft 40 olivine mineral 40 gravitational interaction 40 Gerhard Schwehm 40 protoplanets 40 extragalactic 40 quark gluon 40 SIRTF 40 Cydonia region 40 Trapezium 40 NASA MESSENGER spacecraft 40 Apophis asteroid 40 dinosaurs coexisted 40 supernovae explosions 40 interstellar cloud 40 Serpens Cauda 40 Mars Uranus Neptune 40 protoplanetary disc 40 hydrogen helium 40 ultracool 40 supersymmetric particles 40 Libra constellation Vogt 40 Earth radii 40 XTE J# 40 NASA LCROSS 40 gravitational anomalies 40 Martian craters 40 earthlike planets 40 Cygnus Lyra region 40 infinite expanse 40 Schwarzschild radius 40 spherical halo 40 IRAS #-# 40 Chicxulub impact 40 comet Lulin 40 celestial phenomena 40 MN4 40 Europasaurus 40 planet HD#b 40 planets constellations 40 smallest marsupials 40 mystical realm 40 sterile neutrino 40 planet gravitational tug 40 galactic disk 40 dubbed Operation Scorched 40 meteor impacts 40 Saturn moon Iapetus 40 nucleosynthesis 40 HM Cancri 40 habitable worlds 40 chondrites 40 Earthlike planets 40 Mount Bosavi 40 smoothest flattest 40 Astrophysicists 40 Saturn moon Mimas 40 astronomer Nicolaus Copernicus 40 Higgs Boson 40 constellation Hercules 40 Greatest Showman 40 Spitzer Space Telescopes 40 star gazer 40 constellation Cassiopeia 40 Emily Lakdawalla 40 Aries Taurus 40 sidereal 40 cluster NGC 40 astronomer 40 tow dollies 40 KT boundary 40 mathematician Pythagoras 40 baryonic matter 40 meteoroid 40 celestial sphere 40 Cassini flyby 40 R#a# 40 sentient inhabitants 40 elongated orbits 40 extrasolar planet HD #b 40 microlensing 40 Meteoritical Society 40 Camelopardalis 40 Jupiter moon Io 40 moon Canup 40 constellation Andromeda 40 aeon 40 superdense 40 Vourlidas 40 VD# [001] 40 Snowball Earth 40 Outer Space Treaty 40 oblong orbit overlaps 40 UDFy # 40 magnetic monopoles 40 Shoemaker Levy 40 Comet Elenin 40 V# Puppis 40 OGLE 40 comet 40 Alex Filippenko 40 hypernova 40 Perseus Cluster 40 supernova 40 Antiope 40 planet Gliese #c 40 exerts gravitational pull 40 cosmological theories 40 eccentric orbits 40 highly magnetized neutron 40 Wolf Rayet stars 40 YU# 40 radioactive nuclei 40 Nasa spacecraft 40 HD #b [001] 40 satellite IKONOS 40 permanently shadowed craters 40 Mercury flyby 40 Geza Gyuk 40 interstellar dust particles 40 constellation Lyra 40 spinning neutron 40 Cassini spacecraft orbiting 39 German astronomer Johannes 39 supernovae explode 39 Virgo Cluster 39 Tarantula Nebula 39 extraterrestial 39 Surtsey 39 filamentary structure 39 Keyhole Markup Language 39 Samuel Oschin Telescope 39 noctilucent clouds 39 axis wobbles 39 moon Deimos 39 Uranus 39 Planetary nebulae 39 Cepheus 39 AB Aurigae 39 #P/Holmes 39 Viking landers 39 anthropogenic global warming 39 brown dwarf 39 heliocentric universe 39 perihelion 39 planetary nebulae 39 comet McNaught 39 tholins 39 shadowy craters 39 cosmogony 39 astronomical observatory 39 extrasolar worlds 39 Martian meteorite 39 MEarth 39 Tom Burbine 39 bedrock outcropping 39 Earthlike planet 39 Corot 9b 39 circumstellar 39 protostars 39 strangelet 39 tidally locked 39 gaseous planets 39 gravitational microlensing 39 galactic cores 39 supercontinent 39 Thaicom Pcl satellite 39 dust motes 39 hypervelocity stars 39 planetary conjunctions 39 aphelion 39 COROT 39 elongated orbit 39 photosphere 39 Observatory telescope 39 Konacki 39 gravitational keyhole 39 interstellar grains 39 Higgs Boson particle 39 Saturnian moon 39 protons neutrons 39 star Fomalhaut 39 GZK cutoff 39 sun corona 39 Cosmonaut Yuri Gagarin 39 dinosaur extinction 39 Bernhard Fleck 39 astronaut Eugene Cernan 39 globular cluster 39 Planetary Transits 39 Tharsis Rise 39 floresiensis 39 meteoritic 39 Hale Bopp 39 Mayan calendar ends 39 interstellar dust grains 39 Comet Machholz 39 Astronomically 39 Neutron Spectrometer 39 shepherded Tolkien Middle 39 J# +# [002] 39 astrometry 39 Kristian Matsson 39 Bonnie Buratti 39 subsurface ocean 39 Explorer WISE 39 spacecraft Cassini 39 Astrophysicist 39 Triangulum Galaxy 39 colliding galaxies 39 GA6 39 exosolar planets 39 Evolution Explorer 39 Wolszczan 39 waxing gibbous 39 Martian rover 39 Viking orbiters 39 ASTRONOMERS 39 cosmic ray flux 39 planet orbits 39 Svedhem 39 stellar occultations 39 Dysnomia 39 SN#A 39 Alycia Weinberger 39 Quaternary Period 39 superheavy elements 39 Io Europa Ganymede 39 galaxy NGC 39 iridium layer 39 ESA SMART 39 synchronous orbit 39 colonize Mars 39 Caloris Basin 39 chondritic 39 NASA THEMIS 39 metallicity 39 Cometary 39 Nicolas Copernicus 39 Valles Marineris canyon 39 solar neutrinos 39 emits X rays 39 Observatory STEREO 39 super Earths 39 cometary 39 spacefaring 39 Saharan Desert 39 moonquakes 39 homochirality 39 globulars 39 asteroid collides 39 constellation Vulpecula 39 primordial 39 village Deerlick 39 Eridanus 39 particle analyzers 39 planetary orbits 39 constellation Ursa Major 39 comet chaser 39 spacefaring civilization 39 sentient intelligent 39 Syrtis Major 39 Virgo cluster 39 reflection nebula 39 moon 39 archaeo 39 Exequiel Estay head 39 supergiant star 39 rubbishy poems 39 Descent Imager Spectral Radiometer 39 gaseous envelope 39 Jupiter Ganymede 39 axions 39 Anisotropy Probe WMAP 39 impactor spacecraft 39 Venusians 39 neighboring Andromeda galaxy 39 heliospheric 39 meteoroid impacts 39 Mamajek 39 Mars Phobos 39 NASA twin rovers 39 constellation Aquarius 39 spinning neutron stars 39 extraterrestrial 39 Io volcanoes 39 Gamma ray burst 39 Super Earths 39 moon Phobos 39 Sombrero Galaxy 39 constellation Draco 39 Copernican theory 39 Tunguska Event 39 Eagle Nebula 39 merging galaxies 39 orbiter Mars Odyssey 39 Tunguska Siberia 38 KH #D 38 weakly interacting 38 particle physicists 38 magnetic polarity 38 moonlet 38 Lake Cheko 38 spaceweather.com 38 Saturn outermost 38 Pluto Kuiper Belt 38 waning crescent 38 planets orbiting 38 Edwin Hubble 38 observational astronomy 38 millisecond pulsars 38 asterism 38 astronomer Ptolemy 38 Particle physics 38 Dantooine 38 Eta Carina 38 orbiting Hubble Space Telescope 38 protoplanetary discs 38 earliest hominid 38 galaxy cluster 38 Jørn Hurum 38 Mars Neptune Uranus 38 Tycho supernova 38 galactic mergers 38 Adam Riess 38 meteorite impacts 38 Mars northern latitudes 38 GT9 38 Scorpii 38 Saturn outermost ring 38 gibbous 38 kaons 38 moon Mab 38 ESA GOCE 38 Astronomers 38 Impartial observers 38 martian 38 Mercury Uranus 38 Saturn Jupiter Uranus 38 Capricornus 38 spacecraft orbiting 38 Leonard Susskind 38 Einstein relativity theory 38 foreground galaxy 38 proplyds 38 Frederic Pont 38 Martian rovers 38 Komossa 38 cryovolcanism 38 transhuman 38 Murchison meteorite 38 constellation Auriga 38 Saturn moon 38 warming alarmists 38 Mojzsis 38 smoothest flattest spot 38 luminous galaxies 38 steers starship 38 IllumiNations Reflections 38 Gliese 38 X ray binary 38 asteroid Eros 38 Gusev crater 38 humanoid aliens 38 #P/Churyumov-Gerasimenko 38 Mount Tambora 38 THEMIS Image 38 Mars Jupiter Uranus 38 occultation 38 Astronomers Find 38 Frank Bertoldi 38 Astrophysical 38 X ray binaries 38 hydroxyl molecules 38 Madhulika Guhathakurta 38 carbonate minerals 38 Ophiuchus 38 Hipparcos 38 oddball planetary 38 align creator Joss 38 buckypaper virtually 38 reionization 38 Hayabusa spacecraft 38 Bok globules 38 Hawking radiation 38 Lunar Crater 38 golden toad 38 perigee moon 38 dust mote 38 phlogiston 38 stellar occultation 38 planet habitability 38 Doppler shifts 38 reptilian aliens 38 penumbral shadow 38 Nikku Madhusudhan 38 Schawinski 38 moon Enceladus 38 brown dwarfs 38 Transiting 38 meteorite craters 38 Halley Comet 38 Planet X. 38 icy moon Enceladus 38 zodiacal dust 38 Doppler Effect 38 ejecta 38 Cygnus X 38 telescope Uranus 38 aurorae 38 transiting planets 38 winged messenger 38 occultations 38 Pleiades cluster 38 Type Ia supernova 38 Carina constellation 38 infalling 38 extrasolar planets 38 Earths orbiting 38 planetary embryos 38 Einstein theories 38 Hubble orbits 38 journal Meteoritics 38 intracluster 38 exoplanets 38 Eta Carinae 38 comets moons 38 orbiting Gliese 38 Solar Terrestrial Relations 38 Chicxulub crater 38 HARPS instrument 38 Carnegie Institution planetary geologist 38 Helix Nebula 38 origins spectrograph 38 Higgs particle 38 astronomy 38 circumstellar dust 38 Kuiper Belt 38 quantum particle 38 antiquarks 38 Orionids 38 astronomical observations 38 rotational axis 38 Tombaugh 38 antarctic 38 gamma ray observatory 38 circular orbits 38 silicate dust 38 starlike