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(Click for frequent words.) 63 demote Pluto 56 Pluto planetary status 55 Pluto 55 Kuiper Belt object 55 dwarf planet 54 Pluto Eris 54 demoted Pluto 53 plutoid 53 Pluto planethood 53 Kuiper Belt Objects 52 dinosaur extinction 52 plutoids 52 Kuiper belt objects 52 gravitational interactions 52 planemos 52 WASP #b 51 gravitational tides 51 Corot 7b 51 largest moon Charon 51 Kepler #b 51 KBOs 51 Upsilon Andromedae 51 gravitational perturbations 50 moon gravitational pull 50 astronomers 50 Kuiper Belt Object 50 Gliese #g 50 trans Neptunian objects 50 UB# [003] 50 planets 49 Einstein theories 49 dwarf planets 49 outer planets 49 matter antimatter asymmetry 49 circumstellar disks 49 Gliese #c 49 GJ #b [001] 49 Cosmic Microwave Background 48 Haumea 48 Emily Lakdawalla 48 comets asteroids 48 Dwarf Planet 48 Einstein relativity theory 48 planetary astronomy 48 V# Mon 48 lensing galaxy 48 SIRTF 48 HD #b [002] 48 Fermi paradox 48 retrograde orbit 48 HD#b 48 extrasolar 48 planets orbits 48 interstellar dust 48 GLAST telescope 48 planetoid 48 asteroids comets 48 CoRoT 7b 48 icy comets 48 Gliese #e 48 Late Heavy Bombardment 48 HIP #b 47 Nibiru 47 Saturn Uranus 47 Kuiper belt object 47 AGNs 47 comets orbiting 47 gravitational interaction 47 Charon Pluto 47 P/# A2 47 planetary orbits 47 Quadrantids 47 Kepler 9c 47 exo planet 47 magnetar 47 Mercury magnetosphere 47 filamentary structure 47 axions 47 planets orbiting sun 47 OGLE TR #b 47 planethood 47 Yarkovsky effect 47 extraterrestrial origin 47 nucleosynthesis 47 colliding galaxies 47 Pluto planetary 47 Gliese #G 47 CoRoT #b 47 SN#A 47 exoplanets orbiting 47 colliding asteroids 47 Makemake 47 Avishay Gal Yam 46 Astrological lore 46 Gamma ray burst 46 Fomalhaut b 46 Oort cloud 46 coronal heating 46 retrograde orbits 46 TrES 4 46 German astronomer Johannes 46 substorms 46 Geza Gyuk 46 Solar System 46 inhabitable planets 46 planet Uranus 46 equatorial bulge 46 Fermi Telescope 46 magnetic substorms 46 occultations 46 Epsilon Aurigae 46 extrasolar planets 46 Uranus Neptune 46 lunar perigee 46 transiting planet 46 galactic cosmic rays 46 Cancri e 46 supernova explosion 46 YORP effect 46 COROT 46 planetary nebulae 46 Cassini Huygens 46 exoplanet orbiting 46 asteroid collisions 46 Fermi telescope 46 magnetars 46 BP Psc 46 Nasa spacecraft 46 Giovanni Cassini 45 Mamajek 45 millisecond pulsar 45 RQ# 45 Kuiper belt 45 distant supernovae 45 periodic dimming 45 Comet Hartley 2 45 Zeta Ophiuchi 45 planets comets 45 galaxy M# [001] 45 GRBs 45 exosphere 45 Kuiper Belt 45 Extrasolar planets 45 Gravitational waves 45 Jupiter gravitational pull 45 transiting exoplanet 45 starquakes 45 planetary Transits 45 Maunder minimum 45 Henize #-# 45 observable phenomena 45 SN #gy 45 International Astronomical 45 comets 45 earthshine 45 IAU 45 Maria Zuber 45 cosmic ray flux 45 supermoon 45 ALH# 45 Manned missions 45 exoplanetary 45 Astrophysicists 45 super perigee moon 45 Cosmologists 45 Neil DeGrasse Tyson 45 Comet Holmes 45 cosmos 45 cosmic collisions 45 NEAs 45 Solar Dynamics Observatory 45 Neil deGrasse Tyson 45 Oort Cloud 45 SIM PlanetQuest 45 Sara Seager 45 extrasolar planets orbiting 45 GRB #B 45 brightest supernova 45 KT extinction 45 Fritz Zwicky 45 spiral nebulae 45 astronomical phenomena 45 Uranian 45 God Particle 45 Jovian moons 45 Grammier 45 Kepler discoveries 45 dustier stormier atmosphere 45 cosmic phenomena 45 Toutatis 44 planets orbiting distant 44 moon Enceladus 44 universal gravitation 44 protoplanet 44 sunlike star 44 SuperMoon 44 astrophysicists 44 heliocentric 44 amateur skywatchers 44 Saturnian moon 44 HAT P 44 mu Arae 44 dwarf spheroidal galaxies 44 XO 3b 44 Martians invading 44 Einstein relativity 44 Alexey Vikhlinin 44 Hale Bopp 44 oblate spheroid 44 observable universe 44 cosmological theories 44 Snowball Earth 44 Type 1a supernova 44 New Horizons spacecraft 44 planet HD #b 44 Comet Halley 44 Uranus 44 submillimeter galaxies 44 Konacki 44 asteroid Ceres 44 asteroid 44 Type Ia supernovas 44 Clyde Tombaugh 44 exosolar planets 44 faraway galaxies 44 extraterrestrial visitation 44 Grillmair 44 supernova explosions 44 Venus Neptune Uranus 44 Rayleigh scattering 44 Mercury retrograde 44 Higgs boson particle 44 particle colliders 44 brown dwarfs 44 exo planets 44 Earthlike 44 solar flares 44 planet magnetosphere 44 sized planets orbiting 44 Einstein theory 44 Hyakutake 44 Galilean moons 44 cosmic ray 44 Chicxulub 44 interplanetary spacecraft 44 neighboring Andromeda galaxy 44 XTE J# 44 Svedhem 44 Saturn moon 44 type Ia supernova 44 Earth radii 44 Kepler Space Telescope 44 reionization 44 Earth magnetosphere 44 Pluto Charon 44 #P/Churyumov-Gerasimenko 44 Earth 44 Adam Riess 44 Sasselov 44 Extrasolar 43 journal Icarus 43 IAU definition 43 NASA Kepler 43 comet Shoemaker Levy 43 comet Tempel Tuttle 43 Jupiter moons 43 meteorite impacts 43 anthropic principle 43 moonquakes 43 BP Piscium 43 Higgs Boson 43 cosmologists 43 orbiting telescope 43 Percival Lowell 43 Jupiter flyby 43 exoplanets planets outside 43 Stephan Quintet 43 twin STEREO spacecraft 43 millisecond pulsars 43 R Coronae Borealis 43 X ray afterglow 43 galactic mergers 43 Type Ia supernova 43 orbiting 43 Kepler 9b 43 quasars 43 Saturn rings 43 cosmic 43 Clyde Tombaugh discovered 43 Bug Nebula 43 celestial bodies 43 Small Body Nomenclature 43 dirty snowballs 43 Project Ozma 43 gamma ray burst 43 elongated orbit 43 Fermi Paradox 43 Upsilon Andromedae b 43 distant galaxy 43 COROT exo 3b 43 interstellar dust grains 43 galactic collisions 43 Caltech astronomer 43 exoplanet 43 rocky extrasolar planet 43 type Ia supernovae 43 Magnetars 43 nicknamed Xena 43 supersymmetric particles 43 coronal loops 43 Mars Uranus Neptune 43 Milankovitch cycles 43 NASA MESSENGER 43 Halley comet 43 magma ocean 43 Kepler Mission 43 galactic cannibalism 43 Eta Carinae 43 Cassini Huygens spacecraft 43 protoplanetary disk 43 comet 43 Orbiting Carbon Observatory 43 Phaethon 43 supernova 43 Jupiter Icy Moons 43 Sromovsky 43 Sedna 43 universe 43 KH #D 43 BLG #Lb 43 extrasolar planet 43 outermost planet 43 TrES 43 Earthlike planets 43 Comet Machholz 43 detect gravitational waves 43 Pluto dwarf 43 Epsilon Eridani 43 supernovas 43 GJ#b 43 gamma ray bursts 43 AB Aurigae 43 Hot Jupiters 43 Friis Christensen 43 SN #A 43 Mandushev 43 micrometeoroids 43 chemical abundances 43 MErcury Surface Space ENvironment 43 Interstellar Boundary Explorer 43 dwarf galaxy 43 meteoroid impacts 43 WMAP 43 Cabeus crater 43 MN4 43 MAVEN 43 coronal mass ejection 43 Sagittarius B2 43 RS Ophiuchi 43 JDEM 43 star Gliese 43 Higgs bosons 43 celestial object 43 Carina constellation 43 Svensmark 43 Terrestrial Planet Finder 43 orbiting Cassini spacecraft 43 GQ Lupi 43 Saturn moons 43 LCROSS 42 penumbral lunar eclipse 42 YU# 42 icy moons 42 Solar Terrestrial Relations 42 galaxies 42 active galactic nuclei 42 Torino Scale 42 X ray emission 42 meteorite bombardment 42 fainter objects 42 Seyfert galaxies 42 Exoplanets 42 Pluto Kuiper Belt 42 neutralino 42 NASA 42 planet TrES 42 Brownian motion 42 abiogenesis 42 planetary astronomer 42 Evolution Explorer 42 Cosmic Microwave Background CMB 42 GRB # 42 gaseous planet 42 moons 42 spacecraft flyby 42 Cassini Regio 42 asteroidal 42 aurorae 42 baryon 42 cryovolcanism 42 planetary 42 Beta Pictoris 42 astronomer Clyde Tombaugh 42 Saturn moon Mimas 42 Hubble observations 42 noctilucent clouds 42 # Apophis 42 exoplanets 42 accretion disks 42 astronomer Johannes Kepler 42 Anthropic Principle 42 smallest exoplanet 42 comet nucleus 42 astrophysical 42 perihelion 42 gravitational tugs 42 red supergiants 42 innermost planet 42 astronomy 42 Omega Centauri 42 Enceladus flybys 42 galaxy NGC 42 ultraluminous galaxy 42 Comet Hale Bopp 42 NASA Great Observatories 42 SN #C 42 jovian 42 perigee moon 42 dynamical evolution 42 Chicxulub impact 42 luminous galaxies 42 Phil Plait 42 Vikhlinin 42 Owen Gingerich 42 relativistic proton dark 42 Type 1a supernovae 42 Kuiper Belt objects 42 Planck satellite 42 Kepler Telescope 42 #P/Holmes 42 habitable worlds 42 Gravitational lensing 42 spherical halo 42 NASA Kepler telescope 42 LCROSS spacecraft 42 demoting Pluto 42 Voorwerp 42 galactic cosmic ray 42 eclipsing binary 42 extrasolar planetary systems 42 Vakoch 42 flyby spacecraft 42 Stardust NExT 42 Heisenberg Uncertainty Principle 42 baryonic matter 42 Uranus Jupiter 42 planets moons 42 gravitationally 42 Planetary Society 42 olivine mineral 42 Jupiter Saturn 42 hunting Kepler telescope 42 Higgs singlet 42 baryons 42 Filippenko 42 Atlantis rocketed 42 Cassini Huygens Mission 42 cometary 42 asteroids 42 orbiting Hubble Space Telescope 42 sterile neutrinos 42 infrared observatory 42 thermonuclear explosion 42 Bill Borucki Kepler 42 Alex Filippenko 42 distant quasar 42 planet orbits 42 XMM Newton 42 elliptical orbits 42 subatomic scale 42 ESA Herschel 42 R#a# 42 meteor impacts 42 blue straggler 42 planetesimals 42 waxing gibbous moon 41 gravity warps 41 Mimas 41 MIT planetary scientist 41 Mars Atmosphere 41 runaway greenhouse 41 Big Bang cosmology 41 barred spiral galaxy 41 HM Cancri 41 GJ #b [002] 41 Ian McShane Pillars 41 Mark Changizi 41 saber toothed vegetarian 41 Swift Tuttle 41 Venus Climate Orbiter 41 Red Rectangle 41 Cassini flyby 41 Andrea Ghez 41 tidal bulge 41 sunlike stars 41 comets meteors 41 atmospheric phenomena 41 Antennae Galaxies 41 IntergalaticEarth 41 Gravity Probe B 41 Quaoar 41 CMEs 41 blackholes 41 planet gravitational tug 41 comet hurtling 41 baryonic 41 panspermia 41 Tombaugh 41 mass extinctions 41 Oscillations 41 Hubble 41 dimming starlight 41 Theorists 41 Wolf Rayet star 41 gravitational keyhole 41 galactic alignment 41 occulted 41 Galilean satellites 41 Saturnian system 41 Albedo 41 moons orbiting 41 sundog 41 radial velocity technique 41 carbonate minerals 41 Saturnian 41 climate modelers 41 GALEX 41 quark gluon plasma 41 planet 41 Krimigis 41 moon Io 41 Prof Pillinger 41 starburst galaxy 41 Earthlings 41 Tycho supernova 41 geomagnetic activity 41 pulsars 41 planetary science 41 heliocentric model 41 NASA STEREO 41 cosmological constant 41 cosmological distances 41 faint galaxies 41 Plate Tectonics 41 gravitational redshift 41 Doppler shifts 41 brown dwarf 41 PSR J# 41 Jovian moon 41 Antenna LISA 41 Dominique Cassini 41 Saturn auroras 41 gravitational microlensing 41 binary quasar 41 celestial mechanics 41 moons Phobos 41 elliptical orbit 41 RHESSI 41 CMB radiation 41 astrobiologists 41 CoRoT satellite 41 MOND 41 cometary debris 41 moons circling 41 Epimetheus 41 journal Meteoritics 41 Compton Gamma Ray 41 planets Uranus 41 Shri Kulkarni 41 axis wobbles 41 puny Pluto 41 Neutron stars 41 sterile neutrino 41 Microlensing 41 Carl Friedrich Gauss 41 HD #b [001] 41 Laser Interferometer Space 41 Vourlidas 41 rocky planets 41 Jupiter Ganymede 41 Libra constellation Vogt 41 gamma ray observatory 41 galaxy formation 41 embodied cognition 41 astrophysical objects 41 Gamma ray bursts 41 spinning neutron stars 41 CoRoT 9b 41 Voyager spacecraft 41 Perseid shower 41 Mars Neptune Uranus 41 lunar crust 41 WIMPs 41 astronomical objects 41 ringed planet 41 Neutrinos 41 Cassini 41 blazars 41 astrobiology 41 Comet Hartley 41 interstellar cloud 41 planet WASP #b 41 meteoroid 41 Pasachoff 41 CoRoT 41 superstring theory 41 Union IAU 41 subsurface ocean 41 Exoplanet 41 Milky Way Galaxy 41 Astrophysical 41 hydrogen nuclei 41 assumed planets circling 41 Galaxy Evolution 41 Timothy Spahr 41 Muons 41 Anisotropy Probe WMAP 41 Hipparcos 41 J# +# [002] 41 Supermoon 41 protoplanetary disks 41 planetary alignments 41 QQ# 41 planet Gliese #g 41 Wilkinson Microwave Probe 41 UCO Lick 40 planets orbiting 40 exoplanetary systems 40 Orionids 40 Crab Nebula 40 spiral galaxies 40 transiting planets 40 Gerard Kuiper 40 Gerhard Schwehm 40 red supergiant 40 SN #E 40 Mojzsis 40 pronounced elongation 40 clumpiness 40 Hale Bopp comet 40 Saturn Jupiter Uranus 40 neutralinos 40 Fomalhaut 40 astrobiological 40 gravitationally bound 40 HL Tau 40 galaxy clusters 40 elongated orbits 40 Mars Phobos 40 NASA Wilkinson Microwave 40 terrestrial planets 40 Mars Uranus 40 infalling 40 icy moon Enceladus 40 solar corona 40 Higgs particle 40 Particle physics 40 PlanetQuest 40 Extrasolar Planet 40 globular cluster 40 James Lovelock 40 Mario Livio 40 Sigurd Hofmann 40 Comet Lulin 40 planet orbiting 40 Helix nebula 40 Hollywood dreck Battlefield 40 ejecta 40 Enceladus 40 pre biotic 40 hot Jupiters 40 Richard Binzel 40 Copernicus Galileo 40 Quadrantid meteor shower 40 Ring Nebula 40 magnetic monopoles 40 sodium atoms 40 supercomputer simulations 40 Wide Angle Search 40 Climate modelers 40 anthropic 40 supernatural explanations 40 WISE spacecraft 40 COROT 7b 40 Follett Pillars 40 Machholz 40 interstellar dust particles 40 microlensing 40 orbits 40 Gaia Hypothesis 40 planets orbiting stars 40 cometary dust 40 protoplanets 40 Proxima Centauri 40 X ray telescopes 40 Martian dust 40 Galileo spacecraft 40 Bad Astronomy 40 elliptical galaxy 40 neutron stars 40 Phoebe orbits 40 undiscovered particle 40 galactic cores 40 frozen sunless 40 Chi Cygni 40 Wolszczan 40 solar nebula 40 SCP #F# 40 magnetic polarity 40 AU Mic 40 catapulted Melroy 40 super Earths 40 planetary embryos 40 Saturn outermost moon 40 homochirality 40 Ordovician extinction 40 Plate tectonics 40 SuitSat 40 planetary alignment 40 supernovae explosions 40 nebulas 40 Charles Bailyn 40 nebular 40 IRAS 4B 40 Hubble telescope 40 ULIRGs 40 protons neutrons 40 orbited Jupiter 40 axial tilt 40 hypervelocity stars 40 Kepler 40 Higgs Boson particle 40 Comet Tempel 1 40 Deep Impact Extended 40 TW Hydrae 40 Big Bang theory 40 volcanic moon Io 40 dwarf galaxies 40 Einstein 40 Lawrence Krauss 40 distant quasars 40 supernova remnants 40 Gell Mann 40 constellation Ursa Major 40 relativity theory 40 sunspot cycle 40 Pegasi b 40 Ringed Planet 40 Richard Feynman 40 superluminal 40 Comet Elenin 40 STEREO spacecraft 40 exobiology 40 ionosphere 40 Gaensler 40 decadal survey 40 gaseous envelope 40 superstrings 40 Shoemaker Levy 40 Harlow Shapley 40 meteoritic material 40 arcsec 40 Gaia Theory 40 Geminid meteors 40 Churyumov Gerasimenko 40 gravitation 40 Earthly contamination 40 Mars orbiting spacecraft 40 Fashion Movie Reviews 40 Earth asteroids 40 axion 40 Geminids 40 heavily cratered 40 Charles Beichman 40 stellar seismology 40 Johannes Kepler 40 constellation Hercules 40 Crab Pulsar 40 nebulosity 40 orbital eccentricity 40 intracluster 40 planets atmospheres 40 spacecraft Cassini 40 interstellar space 40 planets astronomers 40 Gliese #d 40 alien visitations 40 Pioneer Anomaly 40 Cosmologist 40 Explorer WISE 40 Sunspots 40 Mars 40 orbiting Kepler telescope 40 Jakosky 40 MG J# +# 40 telescopic observations 40 supernovae 40 Hipparchus 40 habitable planets 40 supervolcanoes 40 cosmic magnifying glass 40 planets asteroids 40 Asteroid Belt 39 electrons behave 39 circular orbits 39 Type Ia supernovae 39 cosmic rays 39 carbon cenospheres 39 exoplanets planets 39 moon Ganymede 39 Mars orbiter 39 spacetime 39 Herschel Space 39 Comet #P/Holmes 39 Richard Mushotzky 39 microlensing events 39 UA Lunar 39 Heliospheric Observatory SOHO 39 heliocentrism 39 X ray binary 39 Solar flares 39 cosmological observations 39 Nikku Madhusudhan 39 UDFy # 39 interstellar 39 orbital resonance 39 pulsar 39 NASA twin rovers 39 S/# P2 39 Hubble Telescope 39 Hubble servicing 39 Hayabusa explorer returned 39 Herschel Space Telescope 39 whiz harmlessly 39 moon Deimos 39 Wilkinson Microwave Anisotropy Probe 39 highly elliptical orbit 39 Magellanic Clouds 39 orbiting Hubble telescope 39 Jupiter Uranus 39 celestial observations 39 mission Chandrayaan 39 shorter wavelengths 39 galactic disk 39 radial velocity method 39 Astrophysical Journal 39 cosmic microwave radiation 39 Ulysses spacecraft 39 ESA Integral 39 extragalactic 39 Astronomically 39 Milky Way 39 earthlike 39 galaxy 39 Steins asteroid 39 Big Bang 39 G#.# +#.# 39 cosmic strings 39 Henrik Svensmark 39 outermost planets 39 Orion Nebula 39 constellations planets 39 cosmological parameters 39 Lunar Prospector 39 accretion disk 39 LADEE 39 SELENE probe 39 afterglows 39 Neptune Uranus 39 Lunar Reconnaissance Orbiter LRO 39 Mars rover 39 gravitational lensing 39 Maxwell equations 39 Heisenberg uncertainty principle 39 greatest insect emergences 39 comet Wild 39 highly elliptical orbits 39 Astronomers 39 gravitational slingshot 39 mantle plumes 39 manmade global warming 39 Thirty Meter Telescope 39 Neptune Jupiter 39 SMEX 39 heliosheath 39 Nicolaus Copernicus 39 Spaceguard 39 Lunine 39 Permian extinction 39 galactic 39 Fred Hoyle 39 metallicity 39 exopolitics 39 celestial phenomenon 39 telescope Uranus 39 gory spectacles 39 Substorms 39 Mars rovers Spirit 39 gravitational radiation 39 orbital mechanics 39 orbiting planets 39 quantum mechanics 39 merging galaxies 39 Huygens mission 39 heliosphere 39 HD# [002] 39 antineutrinos 39 astronomer Edmond Halley 39 missing baryons 39 microbial ecosystems 39 Mercury Uranus 39 Astrobiologists 39 Schawinski 39 photoelectric effect 39 Epoxi 39 comet Lulin 39 rotating neutron 39 planetary transits 39 Martian 39 Sputnik 39 Orionid meteor shower 39 constellation Eridanus 39 Weakly Interacting Massive Particles 39 supersymmetry 39 WMAP satellite 39 Planck spacecraft 39 reionization epoch 39 NASA Stardust spacecraft 39 B mesons 39 dusty disks 39 celestial 39 Schrödinger cat 39 permanently shadowed craters 39 galaxy redshift 39 tholins 39 Super Earths 39 extrasolar worlds 39 NASA Opportunity rover 39 orbiting Mars 39 SETI @ Home 39 high temperature superconductivity 39 Michael Flasar 39 Butterfly Nebula 39 Newtonian gravity 39 smallest exoplanets 39 Ophiuchus 39 planetoids 39 sunspot activity 39 Supersymmetry 39 auroral displays 39 Drake Equation 39 NASA rovers 39 occultation 39 Maharishi Effect 39 asteroid Vesta 39 auroral emissions 39 Mars Jupiter Uranus 39 gravitational tug 39 martian 39 cosmological 39 Ed Weiler NASA 39 Halley Comet 39 chondrites 39 heliocentric theory 39 Leonids 39 gravitational waves 39 phenomena 39 asteroids orbiting 39 neutron star 39 Lee Smolin 39 habitable planet 39 Hubble Constant 39 twin Voyager spacecraft 39 astrobiology scientist 39 type 1a supernovae 39 extraterrestrial 39 SNR #-#.# 39 comet dust 39 Beta Pictoris b 39 Lagoon Nebula 39 Iapetus 39 Extrasolar Planet Search 39 Anisotropy Probe 39 shadow biosphere 39 celestial objects 39 Milankovitch 39 waning crescent Moon 39 coronal mass ejections 39 Peter Jenniskens