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(Click for frequent words.) 68 planets 65 extrasolar 64 planet 64 cosmic 64 galactic 63 exoplanetary 61 astrophysical 61 Upsilon Andromedae 60 habitable planets 59 icy moons 59 celestial 58 Pluto Charon 58 Earth 58 exo planet 58 interstellar 58 galaxy 58 habitable worlds 58 exoplanets orbiting 58 outer planets 58 Uranus 58 extrasolar planets 57 cosmos 57 Kuiper Belt Objects 57 Kuiper belt objects 57 asteroidal 57 planets orbits 57 jovian 57 cosmological 57 Corot 7b 56 supersymmetric particles 56 circumstellar disks 56 terrestrial planets 56 Solar System 56 GJ#b 56 celestial bodies 56 planets moons 56 Kuiper Belt object 56 Gliese #d 56 planemos 56 habitable planet 56 CoRoT 9b 56 Fomalhaut b 56 Corot 9b 55 supermassive 55 Gliese #c 55 X ray binary 55 Earthlike planets 55 metallicity 55 planets orbiting 55 comets asteroids 55 dynamical 55 Kepler #b 55 Wolszczan 55 trans Neptunian objects 55 Jovian moons 55 astrometry 55 planetary atmospheres 55 magnetospheric 55 galaxy formation 55 nucleosynthesis 54 Milky Way galaxy 54 extrasolar planetary systems 54 Sasselov 54 Kepler 9c 54 eclipsing binary 54 Earths 54 celestial sphere 54 binary asteroid 54 universe 54 earths 54 extragalactic 54 inhabitable planets 54 protoplanetary 54 dynamical evolution 54 Kuiper Belt 54 planet magnetosphere 54 asteroids comets 54 galaxies 54 Planetary 54 planet Uranus 54 radial velocity technique 54 Epsilon Eridani 54 exoplanets 54 cosmological distances 54 exoplanet 53 asteroids 53 potentially habitable planets 53 supernova explosion 53 planetary orbits 53 brown dwarfs 53 Planck satellite 53 rocky planets 53 planetary nebulae 53 WASP #b 53 Beta Pictoris 53 cosmic phenomena 53 cometary 53 radial velocity 53 GJ #b [001] 53 magnetosphere 53 Kuiper belt 53 martian 53 red supergiants 53 super Earths 53 Uranian 53 planets orbiting distant 53 orbits 53 gravitational interaction 53 comets 53 orbital inclination 53 comets orbiting 53 planet orbiting 53 asteroid 53 Galilean satellites 53 gaseous planet 53 extrasolar planetary 53 exoplanets planets 53 orbiting 52 mu Arae 52 planet Gliese #g 52 circumstellar 52 axial tilt 52 Svedhem 52 Cancri e 52 Neutron stars 52 astrobiological 52 electroweak 52 asteroseismology 52 retrograde orbit 52 Earths orbiting 52 planet orbits 52 KBOs 52 moons orbiting 52 Kuiper belt object 52 supergiant star 52 Enceladus 52 occultations 52 galaxy M# [001] 52 Saturnian moon Titan 52 cosmic cannibal 52 Toutatis 52 X ray binaries 52 galactic cosmic rays 52 interstellar cloud 52 Jupiter icy moons 52 Oort Cloud 52 nebular 52 supernovae 52 planetary science 52 subsurface ocean 52 astrometric 52 protoplanet 51 TrES 4 51 planetary Transits 51 Oort cloud 51 magnetic reconnection 51 blue supergiant 51 globular clusters 51 protostars 51 extrasolar planet 51 astronomers 51 transiting planet 51 SUSY 51 extrasolar planets orbiting 51 extraterrestrial civilizations 51 plutoids 51 Earth magnetosphere 51 Orion nebula 51 Neptune Uranus 51 orbital 51 magnetars 51 Higgs bosons 51 elliptical galaxies 51 transiting planets 51 reionization 51 planets Uranus 51 Venusian 51 neutron star 51 Mercury magnetosphere 51 supernova explosions 51 Martian 51 distant supernovae 51 planets orbiting stars 51 spacetime 51 Exoplanets 51 observable universe 51 Galilean moons 51 HD#b 51 substorm 51 interstellar dust clouds 51 millisecond pulsar 51 gravitational microlensing 51 astrophysical objects 51 collisional 51 astrophysical phenomena 51 hydrosphere 51 supernovas 51 supersymmetric 51 Saturn Cassini 51 Pluto Eris 51 Earthlike planet 51 sunlike stars 51 spatially resolved 51 meteor impacts 51 Gravitational waves 51 extraterrestrial 51 planetoid 51 planetary transits 51 BP Psc 51 Einstein relativity theory 51 Epsilon Aurigae 51 moon Enceladus 51 Ulysses spacecraft 51 magnetar 51 asteroid collisions 51 orbited Jupiter 51 luminous galaxies 51 Jupiter Uranus 51 exosphere 51 planets comets 50 Gliese #g 50 Jupiter Saturn 50 baryon 50 planetoids 50 Uranus Neptune 50 SMBH 50 extrasolar worlds 50 protostar 50 SN#A 50 planets atmospheres 50 Mandushev 50 magnetic polarity 50 neutralinos 50 Churyumov Gerasimenko 50 innermost planet 50 distant galaxies 50 baryonic 50 polar 50 interstellar dust 50 Cosmic Microwave Background 50 Milky Way Galaxy 50 protoplanetary disks 50 protoplanets 50 trans Neptunian 50 Saturnian 50 globular cluster 50 Earth biosphere 50 magma ocean 50 Zeta Ophiuchi 50 galaxy cluster 50 Jovian moon 50 airglow 50 HL Tau 50 rotational axis 50 protoplanetary disk 50 X ray observatory 50 Earthlike 50 HD #b [001] 50 earthlike planets 50 prograde 50 Proxima Centauri 50 Comet Elenin 50 distant galaxy 50 Andromeda galaxy 50 gravitational radiation 50 circumstellar disk 50 CoRoT #b 50 red supergiant 50 moon Ganymede 50 moons Phobos 50 Alpha Centauri 50 heliospheric 50 type Ia supernovae 50 asteroid impacts 50 astronomical observations 50 GALEX 50 intergalactic 50 geomagnetic 50 elongated orbits 50 HM Cancri 50 Flyby spacecraft 50 celestial mechanics 50 gravitational 50 Milankovitch cycles 50 exo planets 50 protoplanetary discs 50 Saturn rings 50 galactic alignment 50 AU Mic 50 SIM PlanetQuest 50 terraforming Mars 50 Hot Jupiters 49 lunar craters 49 biosphere 49 Rossby waves 49 superstrings 49 OGLE TR 49 interplanetary 49 interstellar dust grains 49 moon Europa 49 solar corona 49 sized planets orbiting 49 orbital resonance 49 R Coronae Borealis 49 AB Aurigae 49 gravitational lenses 49 Saturn Enceladus 49 XTE J# 49 icy comets 49 Earth asteroids 49 SMBHs 49 solar flares 49 earthlike 49 gravitational perturbations 49 planets asteroids 49 planetary scientist 49 cosmic ray flux 49 galaxy M# [002] 49 Saturn moons 49 intracluster 49 cometary debris 49 Exoplanet 49 cosmic ray 49 infalling 49 cluster NGC 49 Olympus Mons 49 Hubble Space Telescope HST 49 Wolf Rayet star 49 permanently shadowed craters 49 planet gravitational tug 49 PSR J# 49 blue straggler 49 Trojan asteroids 49 Saturn Uranus 49 exosolar planets 49 photosphere 49 Cassini 49 CoRoT 7b 49 hot Jupiters 49 superheavy elements 49 accretion disks 49 infrared astronomy 49 Apophis asteroid 49 magnetotail 49 Saturnian moon 49 moon Io 49 planets orbiting sun 49 solar nebula 49 cosmic collisions 49 Red Planet 49 interstellar clouds 49 comet 49 supermassive black holes 49 proplyds 49 moons circling 49 Vakoch 49 stellar occultations 49 Earth radii 49 BLG #L 49 globulars 49 Solar TErrestrial RElations Observatory 49 prebiotic molecules 49 gravitational pulls 49 CoRoT 49 planetary alignments 49 astronomical objects 49 axions 49 chemical abundances 49 filamentary structure 49 Super Earths 49 Eta Carinae 49 singularities 49 Venusian atmosphere 49 Cassini Huygens 49 Carina constellation 49 HIP #b 49 Upsilon Andromedae b 49 chondrites 49 asteroid belt 49 Konacki 49 comets meteors 49 lunar crust 49 APXS 49 X ray telescopes 49 planetesimal 49 COROT 7b 49 stellar nurseries 49 merging galaxies 49 galactic disk 49 VB #b 48 YORP effect 48 Mercury flyby 48 Andromeda Galaxy 48 neutrino particles 48 particle acceleration 48 Wolf Rayet stars 48 SNe Ia 48 moons 48 astrobiology 48 planetary nebula 48 telescopic observations 48 Explorer WISE 48 heliocentric 48 globular cluster M# 48 Keplerian 48 zodiac constellations 48 Mojzsis 48 exoplanet orbiting 48 Sromovsky 48 Comet Machholz 48 Plate tectonics 48 exobiology 48 Fashion Movie Reviews 48 gravitational tides 48 galactic cores 48 NASA Kepler spacecraft 48 neutrino 48 ultracold atoms 48 VY Canis Majoris 48 interplanetary spacecraft 48 #P/Churyumov-Gerasimenko 48 brown dwarf 48 TNOs 48 high redshift galaxies 48 sunlike star 48 stellar seismology 48 XMM Newton 48 Cepheids 48 polar vortex 48 lunar regolith 48 Valles Marineris canyon 48 SIRTF 48 Jupiter moon Io 48 magnetic monopoles 48 pulsars 48 redshift 48 OGLE TR #b 48 celestial phenomena 48 Alycia Weinberger 48 Martian surface 48 outermost planets 48 Manned missions 48 abiogenesis 48 supernova 48 galactic clusters 48 planet HD#b 48 highly elliptical orbits 48 Saturn moon 48 circular orbits 48 GRBs 48 astrophysics 48 auroral displays 48 Magellanic Clouds 48 Astrophysicists 48 X ray wavelengths 48 Beta Pictoris b 48 Pluto dwarf 48 superluminal 48 infall 48 lunar perigee 48 wavefunction 48 homochirality 48 colliding galaxies 48 satellites orbiting Earth 48 planet HD #b 48 antiproton 48 Universe 48 sextile 48 asteroid Vesta 48 biospheric 48 asteroids orbiting 48 galactic nuclei 48 Heliophysics 48 eclipsing binaries 48 Omega Centauri 48 Fermi Paradox 48 Orion Nebula 48 Sagittarius B2 48 habitable zones 48 Gamma ray burst 48 P/# A2 48 geocentric 48 quasars 48 smallest exoplanet 48 nebulae 48 mineralogical composition 48 magnetic substorms 48 Einstein theories 48 gravitational acceleration 48 interstellar medium 48 galactic collisions 48 SN #A 48 Mars 48 RXTE 48 Nikku Madhusudhan 48 asteroid Ceres 48 neutrino oscillations 48 eccentric orbits 48 heliosphere 48 stellar occultation 48 terra forming 47 Herbig Ae Be 47 Gliese #G 47 Martian atmosphere 47 galactic mergers 47 GZK cutoff 47 Kuiper Belt Object 47 retrograde orbits 47 coronal heating 47 Milky Way halo 47 planetary exploration 47 Particle physics 47 Milky Way 47 cosmological parameters 47 Klaatu Keanu Reeves 47 spectroscopic 47 gravitational slingshot 47 cryosphere 47 active galactic nuclei 47 hydrogen helium 47 microbial ecosystems 47 prebiotic chemistry 47 HD #b [002] 47 pulsar 47 Nibiru 47 Io Europa 47 observable phenomena 47 Kuiper Belt objects 47 Deep Impact comet 47 Jenniskens 47 NASA THEMIS 47 crystalline silicates 47 BLG #Lb 47 journal Meteoritics 47 Comet Hartley 2 47 auroral activity 47 comet Lulin 47 equatorial bulge 47 particle colliders 47 BepiColombo 47 comet hurtling 47 Cepheid variables 47 alien civilizations 47 ringed planet 47 planetesimals 47 Cassini ion 47 equatorial latitudes 47 climate forcings 47 volcano Olympus Mons 47 neutrino oscillation 47 Alex Filippenko 47 Jupiter moons 47 supernovae explosions 47 outer space 47 Voyager spacecraft 47 martian atmosphere 47 hydrostatic equilibrium 47 detect gravitational waves 47 quasiparticle 47 radial velocity method 47 Magnetars 47 Ultraviolet Imaging Spectrograph UVIS 47 cryovolcanism 47 moon Charon 47 geodynamics 47 dusty disks 47 martian surface 47 J# +# [002] 47 constellation Carina 47 spacefaring civilization 47 noctilucent clouds 47 Higgs particle 47 cosmological observations 47 QQ# 47 Avi Loeb 47 elliptical galaxy NGC 47 microlensing events 47 astrobiologists 47 Linda Spilker Cassini 47 moon Titan 47 Earthly 47 Seyfert galaxies 47 SOHO spacecraft 47 Gliese #e 47 transhuman 47 IRC +# 47 spiral galaxies 47 V# Sgr 47 auroral emissions 47 Foing 47 IRAS #-# 47 Triangulum 47 GRB #B 47 humankind 47 carbonaceous chondrites 47 Saturnian moons 47 interstellar space 47 Pluto 47 magnetospheres 47 COROT 47 Einsteinian 47 spacecraft flyby 47 extraterrestial 47 angular momentum 47 gaseous planets 47 SN #gy 47 spectroscopically 47 planet Nibiru 47 RRATs 47 galaxy clusters 47 Gerard Kuiper 47 meteoritic material 47 elliptical orbits 47 Rayleigh scattering 47 planetary astronomy 47 multiverse 47 transiting exoplanet 47 Tau Ceti 47 Comet Halley 47 NASA STEREO 47 biosignatures 47 Earth orbit 46 ESA Herschel 46 supernova SN 46 relativity theory 46 Saturn Jupiter Uranus 46 earth 46 ultraviolet wavelengths 46 Jonathan Lunine 46 XO 3b 46 solar radii 46 lunar 46 exoplanet hunter 46 circumpolar 46 planet WASP #b 46 Comet Hartley 46 extraterrestrial UFOs 46 Evolution Explorer 46 NASA rovers Spirit 46 Descent Imager Spectral Radiometer 46 STEREO 46 NASA Kepler 46 CoRoT satellite 46 trine 46 auroral 46 Type Ia supernova 46 Gal Yam 46 Red Rectangle 46 neutralino 46 Big Bang cosmology 46 Fermi paradox 46 Gravitational lensing 46 orbital eccentricity 46 perihelion 46 aspecting 46 periodic dimming 46 antimatter particles 46 planetary surfaces 46 Mars Uranus 46 intrinsic brightness 46 Jupiter Saturn Uranus 46 rocky terrestrial planets 46 Delta Cephei 46 starburst galaxies 46 Charon Pluto 46 Einstein relativity 46 coronal loops 46 extraterrestrial civilization 46 galaxies collide 46 comet nucleus 46 Venus Climate Orbiter 46 arcsec 46 coronal mass ejections CMEs 46 Crab pulsar 46 Sibeck 46 Ring Nebula 46 observational astronomy 46 Hellas Basin 46 magnetic monopole 46 exoplanetary systems 46 TW Hydrae 46 Goldilocks planet 46 starburst galaxy 46 lensing galaxy 46 cosmological theories 46 sterile neutrinos 46 subatomic 46 Lagrangian 46 masers 46 proto planetary disk 46 gravitationally 46 GQ Lupi 46 carbonaceous chondrite 46 AUs 46 zodiacal dust 46 Astrophysics MOA 46 geomagnetic activity 46 energetic cosmic rays 46 MAVEN 46 Ed Weiler NASA 46 Carina Nebula 46 polar caps 46 Galaxy Evolution 46 Nasa spacecraft 46 Geminga 46 Astronomers 46 heliopause 46 dimming starlight 46 dustier stormier atmosphere 46 moon gravitational pull 46 silicon monoxide 46 Charles Beichman 46 orbiting observatory 46 Bug Nebula 46 Astrophysical 46 tropospheric 46 gravitational lens 46 gravitational attraction 46 luminosities 46 Cancri 46 dwarf planets 46 Solar Orbiter 46 moonquakes 46 proto planetary disks 46 blackholes 46 Elenin 46 antihelium 4 46 Eagle Nebula 46 thermonuclear fusion 46 spacecraft 46 NEAs 46 GLAST 46 Orion constellation 46 hadron 46 AGNs 46 Kepler Mission 46 Vourlidas 46 crewed spacecraft 46 binary asteroids 46 Extrasolar 46 ULIRGs 46 earthlings 46 relativistic particles 46 gamma ray burst 46 hadrons 46 spiral galaxy Messier 46 dwarf galaxies 46 Uranus Jupiter 46 blazars 46 Fornax cluster 46 cosmologists 46 Itokawa 46 Saturn outermost 46 heliocentric model 46 Interstellar Boundary Explorer 46 Fermi telescope 46 impactors 46 MARSIS radar 46 Rosette Nebula 46 Einstein equations 46 neutron stars 46 gamma ray bursts 46 entropic 46 exoplanets planets outside 46 Comet 9P/Tempel 1 46 ejecta 46 PSR B# +# 46 elongated orbit 46 distant supernovas 46 Crab Nebula 46 Phobos 46 ADM Aeolus 46 Voyager probes 46 glacial interglacial 46 planets astronomers 46 inter planetary 46 Keck Interferometer 46 Hubble observations 46 occultation 46 planet Gliese #c 46 Perseus Cluster 46 GJ #b [002] 46 Cygnus Lyra region 46 LHC experiments 46 nightside 46 tidally locked 46 starquakes 46 reentry capsule 46 ion propulsion 46 gamma rays emitted 45 Doppler shift 45 largest moon Charon 45 Martian dust 45 magnetic fields 45 galaxy NGC 45 velocity dispersion 45 Newtonian gravity 45 BP Piscium 45 orbiting gamma ray 45 Schrödinger cat 45 retrogrades 45 atoms 45 atmospheric 45 galactic cosmic ray 45 Yarkovsky effect 45 microlensing 45 navigate autonomously 45 rocky extrasolar planet 45 transiting exoplanets 45 dwarf planet 45 plutoid 45 Dimitar Sasselov 45 millisecond pulsars 45 cosmology 45 Grammier 45 gamma ray observatory 45 cometary impacts 45 NASAs 45 plate tectonics 45 HD# [002] 45 Planets 45 KT extinction 45 Milankovitch 45 climatological 45 Philae lander 45 planets circling 45 Cassini flyby 45 Bonnie Buratti 45 photometry 45 lowermost mantle 45 Sedna 45 Astrophysics Cambridge Mass. 45 Martians invading 45 Coma Cluster 45 Jupiter magnetosphere 45 volcanism 45 Bernard Foing 45 malefic 45 twin STEREO spacecraft 45 nucleon 45 faraway galaxy 45 RY Sagittarii 45 Z boson 45 protoplanetary disc 45 Saturn moon Enceladus 45 meteoroid 45 astronomy 45 Type Ia 45 Observatory STEREO 45 convective 45 Type Ia supernovae 45 dwarf galaxy 45 strange quarks 45 Bruce Jakosky 45 gravitationally bound 45 phyllosilicates 45 cometary dust 45 tidal bulge 45 Henize #-# 45 Kepler Space Telescope 45 aurorae 45 Cassini Orbiter 45 Fomalhaut 45 Supernovae 45 Orientale Basin 45 substorms 45 THEMIS 45 microquasar 45 rover 45 hypervelocity stars 45 sidereal 45 Betelgeuse 45 Mars CRISM 45 Huygens mission 45 cosmological models 45 polarimetric 45 constellation Hercules 45 X ray emitting 45 HAT P 45 chromosphere 45 constellation Cassiopeia 45 cosmic rays 45 moonlets 45 hypervelocity 45 constellation Ursa Major 45 moon Mimas 45 ESA Integral 45 Mars Phobos 45 Hale Bopp comet 45 mantle plumes 45 anthropic 45 planet transits 45 novae 45 Type Ia supernovas 45 occulted 45 gluon 45 orbiting observatories 45 polarimetry 45 sterile neutrino 45 Earth ionosphere 45 Mars landers 45 NASA Fermi Gamma 45 spiral galaxy 45 mantle convection 45 gravitational lensing 45 Herschel Space 45 oceanic 45 Curiosity rover 45 antiparticle 45 homeworld 45 Saturn auroras 45 galactic bulge 45 Shoemaker Levy 45 Saturnian system 45 Crab Pulsar 45 KH #D 45 meteorite impacts 45 JIMO 45 sunspot 45 demote Pluto 45 supervolcanoes 45 planetwide 45 Thomas Zurbuchen 45 moon Mab 45 coronal loop 45 subatomic particle 45 BepiColombo mission 45 single celled microorganisms 45 geomagnetism 45 primordial 45 CMEs 45 supermassive black hole 45 proto galaxies 45 millimeter wavelengths 45 novas 45 Hadean Eon 45 STEREO spacecraft 45 Owen Gingerich 45 Arches Cluster 45 lithospheric 45 Sombrero Galaxy 45 Late Heavy Bombardment 45 Methone 45 Martian craters 45 Spudis 45 Hubble Constant 45 habitability 45 universal gravitation 45 EPOXI 45 Encke gap 45 hypervelocity star 45 SuperWASP 45 Pieter van Dokkum 45 potentially habitable 45 electrodynamics 45 Palaeocene Eocene Thermal Maximum 44 astronomer 44 Bose Einstein condensates 44 particle physics 44 Doppler shifts 44 planetary missions 44 outer heliosphere 44 Gaensler 44 demoting Pluto 44 elliptical galaxy 44 ecliptic plane 44 astrophysicists 44 alien beings 44 spectroscopic measurements 44 gravitational tugs 44 supernova remnants 44 Orbiting Carbon Observatory OCO 44 Anisotropy Probe 44 Climate Experiment GRACE 44 oceans 44 GOSAT 44 Bullet Cluster 44 nebulas 44 NASA Cassini 44 origins spectrograph 44 Noachian 44 exo 44 moons Europa 44 posthuman 44 constellation Pegasus 44 faintest galaxies 44 orbiting planets 44 Higgs boson particle 44 entropy 44 inner moons 44 orbital mechanics 44 cometary nucleus 44 constellations planets 44 Virgo Cluster 44 nebulosity 44 situ measurements 44 Mario Livio 44 UCO Lick 44 meteoroid impacts