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(Click for frequent words.) 69 interstellar medium 66 heliosheath 63 heliosphere 63 heliopause 61 interstellar 60 galaxy 59 protoplanetary disk 58 galactic disk 58 asteroid belt 58 Oort cloud 58 solar nebula 58 planetesimals 58 Solar System 57 observable universe 57 Kuiper belt 57 protoplanets 57 cometary debris 57 magnetosphere 57 planets 57 ejecta 57 Oort Cloud 57 exosphere 57 outer planets 56 comet nucleus 56 Earth magnetosphere 56 comets 56 galactic halo 56 interstellar dust 56 Churyumov Gerasimenko 56 comets asteroids 56 Saturn rings 56 comet 55 photosphere 55 innermost planet 55 Jupiter magnetosphere 55 energetic electrons 55 cometary 55 galaxies 55 supernova explosion 55 Venusian atmosphere 55 elliptical orbits 55 coronal mass ejections CMEs 55 Kuiper Belt 55 circumstellar 55 distant galaxies 55 elongated orbits 55 spacetime 55 magnetotail 55 perihelion 54 accretion disk 54 interstellar particles 54 quark gluon plasma 54 jovian 54 solar corona 54 Martian atmosphere 54 cosmic rays 54 Milky Way galaxy 54 interstellar cloud 54 interstellar clouds 54 icy comets 54 sunlike star 54 Saturn magnetosphere 54 protoplanet 54 extrasolar 54 cometary dust 54 supernova explosions 53 ionized gas 53 gamma rays 53 proto planetary disk 53 Uranus 53 WASP #b 53 Comet #P/Churyumov-Gerasimenko 53 planetoid 53 meteoroids 53 supernovae 53 planets orbits 53 Milky Way halo 53 Kuiper Belt Objects 53 circumstellar disk 53 neutralinos 53 terrestrial planets 53 #P/Churyumov-Gerasimenko 53 Gravitational waves 53 gaseous planet 53 Comet Hartley 2 53 Gamma rays 53 Saturnian moon 52 cosmos 52 planetary nebulae 52 magnetopause 52 comets orbiting 52 Voyager spacecraft 52 galactic 52 distant galaxy 52 interstellar dust clouds 52 planets moons 52 infalling 52 Jovian moons 52 neutron star 52 GJ#b 52 supernova 52 circular orbits 52 heliospheric 52 protostar 52 eccentric orbits 52 icy moons 52 redshifted 52 cosmic microwave background 52 sodium atoms 52 galactic cosmic rays 52 Saturnian 52 Galileo spacecraft 52 Planetary nebulae 52 Tempel 1 52 gravitational interaction 51 comet tail 51 circumstellar disks 51 Virgo Cluster 51 gamma ray emission 51 Earthlike planet 51 planet Uranus 51 Hot Jupiters 51 moons orbiting 51 Comet Tempel Tuttle 51 habitable planet 51 orbits 51 quasar 51 Epsilon Eridani 51 stellar nurseries 51 magnetospheric 51 permanently shadowed craters 51 neighboring Andromeda galaxy 51 planetary embryos 51 Milky Way Galaxy 51 elongated orbit 51 HD#b 51 nebular 51 martian atmosphere 51 Earthlike planets 51 comet Churyumov Gerasimenko 51 supermassive black hole 51 Corot 7b 51 moonlet 51 cosmic 51 Upsilon Andromedae 51 coronal mass ejection 51 accretion disks 51 nebula 51 Neutron stars 51 planetary nebula 50 comet orbit 50 retrograde orbit 50 planetary orbits 50 Enceladus 50 coronal mass ejections 50 outer space 50 VY Canis Majoris 50 lunar crust 50 planet Gliese #c 50 chondrules 50 universe 50 Fomalhaut b 50 moon Enceladus 50 rocky planets 50 starburst galaxies 50 galaxy clusters 50 tholins 50 magnetic fields 50 magma ocean 50 CMEs 50 comet Tempel Tuttle 50 quasars 50 distant supernovae 50 filamentary structure 50 subatomic particles 50 gaseous envelope 50 KBOs 50 magnetar 50 Pluto Charon 50 relativistic particles 50 mesosphere 50 asteroidal 50 moon Io 50 nucleosynthesis 50 comet dust 50 chromosphere 50 antimatter particles 50 silicate dust 50 gravitational interactions 50 constellation Carina 50 transiting exoplanet 50 superfluid 50 Bok globules 50 protoplanetary disks 50 particle acceleration 49 elliptical galaxy 49 corona 49 Kepler 9c 49 habitable planets 49 Earth orbit 49 globular clusters 49 circular orbit 49 Earthlike 49 magnetic monopoles 49 radioactive decay 49 highly elliptical orbit 49 Earth radii 49 Swift Tuttle 49 Gamma ray bursts 49 interplanetary 49 Wolf Rayet star 49 hypersonic speeds 49 infall 49 heavily cratered 49 exo planets 49 NASA MESSENGER spacecraft 49 penumbral shadow 49 Tempel Tuttle 49 ringed planet 49 V# Mon 49 gravitational tides 49 supernovas 49 Cosmic Microwave Background 49 planet HD #b 49 CoRoT #b 49 radiative 49 sterile neutrino 49 gravitationally bound 49 synchronous orbit 49 spherical halo 49 highly elliptical orbits 49 Eta Carinae 49 Galilean moons 49 CMB photons 49 weakly interacting 49 Asteroid Belt 49 Crab Nebula 49 protostars 49 X ray emission 49 synchrotron emission 49 WIMPs 49 galactic magnetic 49 planet WASP #b 49 potentially habitable planets 49 Epoxi 49 AGNs 49 pulsar 49 wormhole 49 Gemini constellation 49 Milky Way 49 ionised 49 Deep Impact craft 49 atomic particles 49 supernova remnants 49 supernovae explosions 49 planet magnetosphere 49 antiprotons 48 cosmological theories 48 magnetic reconnection 48 cosmological distances 48 constellation Virgo 48 electron neutrinos 48 exoplanets planets 48 Alfven waves 48 collisional 48 interstellar distances 48 Mojzsis 48 Comet Tempel 1 48 galactic clusters 48 ionise 48 nebulae 48 planetoids 48 ULIRGs 48 exoplanetary 48 galactic alignment 48 Saturn auroras 48 neutron stars 48 cosmic particles 48 galaxy cluster 48 protoplanetary discs 48 sunlike stars 48 supergiant star 48 coronal loops 48 Saturn moons 48 asteroids 48 infrared wavelengths 48 meteoroid impacts 48 Ulysses spacecraft 48 comet Tempel 1 48 impactors 48 Toutatis 48 Higgs bosons 48 ionosphere 48 asteroids comets 48 exosolar planets 48 interstellar dust grains 48 magnetars 48 particles 48 celestial bodies 48 Cabeus crater 48 planets orbiting distant 48 HD #b [002] 48 AB Aurigae 48 HL Tau 48 detect gravitational waves 48 hadrons 48 asteroid 48 habitable worlds 48 observable Universe 48 GJ #b [001] 48 Sedna 48 lunar surface 48 asteroid Vesta 48 quantum particle 48 dwarf galaxy 48 RS Ophiuchi 48 protons 48 aphelion 48 planemos 48 relativistic jets 48 cometary material 48 constellation Cassiopeia 48 spacecraft Cassini 48 Mandushev 48 superluminal 48 Proxima Centauri 48 cosmic ray particles 48 planet Nibiru 48 substorm 48 Bullet Cluster 48 millisecond pulsar 48 proplyds 48 X ray binary 48 Corot 9b 48 helium atoms 48 electrons behave 48 ionized hydrogen 48 gamma rays emitted 48 elliptical orbit 48 intrinsic brightness 48 elliptical galaxies 48 umbral shadow 47 Geminga 47 Comet 9P/Tempel 1 47 Interstellar Boundary Explorer 47 GQ Lupi 47 exciton 47 red supergiant 47 moon Ganymede 47 Martian surface 47 Beta Pictoris 47 cosmic ray 47 lunar crater 47 Andromeda galaxy 47 neutrinos 47 Saturn Cassini 47 Comet Churyumov Gerasimenko 47 subatomic particle 47 gravitational attraction 47 neutrino 47 planetary surfaces 47 constellation Hercules 47 planets Uranus 47 Antennae Galaxies 47 twin Voyager spacecraft 47 Alfvén waves 47 meteoroid 47 interstellar boundary 47 subatomic 47 nucleon 47 Comet Hartley 47 NEAs 47 supersymmetric particles 47 Supernovae 47 Cosmic Microwave Background CMB 47 photons 47 subsurface ocean 47 red supergiants 47 Upsilon Andromedae b 47 supermassive black holes 47 gravitational waves 47 dwarf spheroidal galaxies 47 GJ #b [002] 47 Nasa spacecraft 47 inhabitable planets 47 antiparticle 47 Galactic cosmic rays 47 exoplanets orbiting 47 gravitational radiation 47 Cancri e 47 prograde 47 reionization 47 gaseous 47 silicon monoxide 47 NASA Stardust spacecraft 47 constellation Aquarius 47 Trojan asteroids 47 Svedhem 47 Comet Halley 47 galactic cores 47 particles emitted 47 globular cluster 47 starburst galaxy 47 Magellanic Stream 47 Saturnian system 47 Kuiper Belt objects 47 spacecraft flyby 47 comet Wild 47 Comet Swift 47 atoms 47 planetary 47 constellation Ursa Major 47 ionized particles 47 Red Rectangle 47 Phoebe orbits 47 planet orbits 47 Kuiper belt objects 47 infrared radiation 47 meteor impacts 47 ultraviolet wavelengths 47 Sagittarius B2 47 orbital resonance 47 retrograde orbits 47 Earth 47 tau neutrinos 46 SN #gy 46 Supernova #A 46 Nibiru 46 helium nuclei 46 massless particles 46 pericentre 46 dirty snowballs 46 redshift 46 constellation Centaurus 46 cosmic radiation 46 constellation Andromeda 46 Halley comet 46 Type Ia supernovas 46 outermost planets 46 gravity warps 46 gaseous planets 46 exoplanets 46 inner moons 46 prebiotic molecules 46 distant supernovas 46 planets orbiting stars 46 blue supergiant 46 Earths orbiting 46 planet 46 SMBH 46 extrasolar planetary systems 46 supernova remnant 46 Wolszczan 46 Yinghuo 1 46 lunar equator 46 martian rocks 46 particle beams 46 phyllosilicates 46 galactic equator 46 Saturn moon 46 Jovian atmosphere 46 volcanic moon Io 46 SN#A 46 infalling gas 46 CoRoT 7b 46 Type Ia supernovae 46 GeV 46 ecliptic plane 46 Saturn outermost moon 46 gamma ray burst 46 supercontinents 46 GRBs 46 luminous galaxies 46 Magellanic Clouds 46 Cosmic ray 46 transiting planet 46 exoplanet 46 orbiting planets 46 Geminid meteors 46 Jupiter Saturn 46 X ray emitting 46 Perseus Cluster 46 planets comets 46 BP Psc 46 Tauri Sb 46 dwarf galaxies 46 HM Cancri 46 Bose Einstein condensates 46 distant suns 46 Type Ia supernova 46 strange quark 46 Andromeda Galaxy 46 axions 46 permanently shadowed 46 intracluster 46 outer layers 46 zodiacal constellations 46 Martian dust 46 Orion Nebula 46 atomic nuclei 46 orbited Jupiter 46 Galilean satellites 46 proto galaxies 46 polar craters 46 hypervelocity stars 46 extrasolar planets 46 colliding protons 46 brown dwarfs 46 Cosmic rays 46 umbra 46 airglow 46 Wolf Rayet stars 46 silicate minerals 46 emit X rays 46 intergalactic 46 ultracold 46 planetesimal 46 occultations 46 Cepheids 46 Itokawa 46 Photons 46 extrasolar worlds 46 Fermi telescope 46 primordial ingredients 46 Comet Elenin 46 dense clumps 46 gravitationally 46 Saturn Uranus 46 blue straggler 46 moon Mab 46 galaxy M# [001] 46 gamma ray bursts 46 Zeta Ophiuchi 46 exo planet 46 planets asteroids 46 antiparticles 46 orbits Saturn 46 solar flares 46 helium atom 46 astronomical objects 46 Beta Pictoris b 46 visible wavelengths 46 galaxy NGC 46 galaxy formation 46 molten magma 46 cometary particles 46 sterile neutrinos 46 constellation Pegasus 46 orbital eccentricity 46 anomalous cosmic rays 46 particle colliders 45 Cosmologists 45 impactor 45 tidally 45 Magnetars 45 Red Planet 45 Higgs particle 45 millimeter wavelength 45 IBEX spacecraft 45 GRB #B 45 comet hurtling 45 hydrosphere 45 electron orbits 45 Messenger spacecraft 45 Jupiter moon Io 45 pions 45 X ray wavelengths 45 Cassini ion 45 asthenosphere 45 baryon 45 hydrogen atoms 45 antiferromagnets 45 merging galaxies 45 orbital 45 gravitational 45 solar neutrinos 45 ENAs 45 antineutrinos 45 ionize 45 trans Neptunian objects 45 electrons 45 X ray pulses 45 Gliese #e 45 inner Oort Cloud 45 gravitational tugs 45 nucleons 45 COROT 45 quantum particles 45 Bose Einstein condensate 45 high redshift galaxies 45 superfluid helium 45 Endurance crater 45 Jupiter Uranus 45 alien civilizations 45 cosmic microwave radiation 45 gravitational perturbations 45 Gliese #c 45 deuterium atoms 45 solitons 45 comet McNaught 45 metallicity 45 sized planets orbiting 45 ejecta blanket 45 WMAP satellite 45 Arches Cluster 45 Hanny Voorwerp 45 IRC +# 45 polar 45 proton antiproton 45 muon 45 Gravitational lensing 45 superdense 45 wormholes 45 Pluto Eris 45 astrophysical 45 Comet #P 45 tropopause 45 CMB radiation 45 kaons 45 hypervelocity star 45 onrushing comet 45 P/# A2 45 globulars 45 Earth ionosphere 45 silicon atoms 45 hydrogen nuclei 45 hypernova 45 astronomers 45 constellation Perseus 45 polaritons 45 protoplanetary 45 Saturnian moon Titan 45 Delta Cephei 45 substorms 45 Apophis asteroid 45 Mimas 45 primordial soup 45 planet transits 45 reflection nebula 45 Muons 45 celestial sphere 45 lunar soil 45 nuclei 45 Distant galaxies 45 proton proton collisions 45 spiral galaxies 45 filaments 45 shuttlecock shaped capsule 45 moonlets 45 Comet Lulin 45 velocities 45 sun corona 45 comet #P/Churyumov-Gerasimenko 45 cometary impacts 45 star Proxima Centauri 45 gamma ray flares 45 dwarf spheroidal 45 quantum tunneling 45 pulsars 45 outer corona 45 planetary atmospheres 45 impactor spacecraft 45 Kuiper belt object 45 astral 45 constellation Puppis 45 Jupiter Ganymede 45 Jupiter moons 45 HD# [002] 45 polar orbit 45 Type 1a supernovae 45 particles WIMPs 45 BP Piscium 45 geospace 45 earthlike planets 45 Martian equator 45 interstellar dust particles 45 Hale Bopp comet 45 iron pnictides 45 gravitational slingshot 45 starquakes 45 reentry capsule 45 moon Mimas 45 gravitational keyhole 45 celestial equator 45 Iapetus 45 extraterrestrial UFOs 45 excitons 44 R Coronae Borealis 44 Methone 44 Comet Machholz 44 electron pairs 44 type Ia supernova 44 Cassini Huygens 44 asteroids orbiting 44 spinning pulsar 44 NASA Cassini spacecraft 44 orbit 44 Stephan Quintet 44 Jovian moon 44 Kepler #b 44 Triangulum 44 interplanetary dust 44 bosonic 44 plasmasphere 44 organic molecules 44 electron orbitals 44 dusty disks 44 tiniest particles 44 Meteor showers 44 superheavy elements 44 spherically symmetric 44 cosmic collisions 44 quantum superposition 44 ecliptic 44 supermassive 44 constellation Gemini 44 runaway thermonuclear 44 antiquarks 44 energetic cosmic rays 44 atmospheric circulations 44 polar vortex 44 detect gamma rays 44 faraway galaxy 44 lithosphere 44 primitive meteorites 44 micro meteorites 44 velocity dispersion 44 CoRoT 44 tidal bulge 44 SIRTF 44 hot Jupiters 44 X ray photons 44 troposphere 44 Saturnian moons 44 constellation Taurus 44 supermassive stars 44 WMAP 44 wave particle duality 44 neutrino particles 44 starlight 44 Saturn moon Enceladus 44 diffract 44 rotating neutron 44 Earth magnetotail 44 bolide 44 comet particles 44 shorter wavelengths 44 VHE gamma rays 44 moons 44 Epsilon Aurigae 44 planet HD#b 44 antiproton 44 W boson 44 Alpha Centauri 44 colliding galaxies 44 novae 44 mu Arae 44 meteorite impacts 44 nebulosity 44 Europa Ganymede 44 auroral 44 ionized atoms 44 panspermia 44 rotating neutron stars 44 Antarctic Dry Valleys 44 meteoritic material 44 sextile 44 gamma ray photons 44 polar stratospheric 44 rotational axis 44 Mercury magnetosphere 44 planets orbiting 44 Ring Nebula 44 star Spica 44 millisecond pulsars 44 fermionic atoms 44 planetary alignments 44 Earth asteroids 44 lunar orbits 44 celestial object 44 extrasolar planet 44 Circinus X 1 44 comet Shoemaker Levy 44 potassium atoms 44 Gerard Kuiper 44 Shackleton crater 44 quark gluon 44 phonons 44 Relations Observatory STEREO 44 photochemical reactions 44 extragalactic 44 Saturn Enceladus 44 water vapor 44 orbital velocity 44 Cassini 44 Solar flares 44 electron density 44 Dwarf galaxies 44 Carina constellation 44 Martian terrain 44 Comet Holmes 44 electron volts 44 permanently shadowed crater 44 Electrons 44 faraway galaxies 44 lunar meteorites 44 micrometeoroids 44 spiral galaxy 44 Kuiper Belt object 44 photon 44 SN #A 44 Fornax cluster 44 crystallites 44 exoplanet orbiting 44 closest flyby 44 Hyakutake 44 Uranus Neptune 44 spinning neutron 44 constellation Aries 44 leptons 44 Jupiter Saturn Uranus 44 cosmological 44 carbonate minerals 44 galaxies collide 44 ray Space Telescope 44 eclipsing binary 44 cosmic cannibal 44 microquasar 44 equator 44 Deep Impact comet 44 Phobos 44 lunar perigee 44 COROT 7b 44 inner asteroid belt 44 shadowed craters 44 Sagittarius dwarf galaxy 44 zodiacal light 44 X ray telescopes 44 Higgs Boson particle 44 spacecraft 43 thin crescent 43 comet Swift 43 Midheaven 43 Cometary 43 dynamical evolution 43 Haumea 43 Mars Uranus 43 SUSY 43 sunward 43 emits X rays 43 giant elliptical galaxy 43 J# +# [002] 43 Bug Nebula 43 reionization epoch 43 hydroxyl molecules 43 Tau Ceti 43 brightest supernova 43 relativistic 43 cosmologists 43 Rydberg atoms 43 Linda Spilker Cassini 43 meridional flow 43 Valles Marineris 43 X ray binaries 43 Saturn moon Mimas 43 cosmic ray collisions 43 constellation Leo 43 Martian 43 New Horizons spacecraft 43 vaporises 43 proto planetary disks 43 galactic cosmic ray 43 Saturn outermost 43 homeworld 43 Bose Einstein Condensate 43 neutral mass spectrometer 43 solar radii 43 undiscovered particle 43 HD #b [001] 43 extraterrestrial civilization 43 Earth asteroid Itokawa 43 vapourise 43 mystical realm 43 extraterrestrial 43 matter antimatter asymmetry 43 antihelium 4 43 Vourlidas 43 Noachian era 43 NASA Voyager spacecraft 43 comet nuclei 43 LHC experiments 43 Martian crater 43 coronagraph 43 eclipsing binaries 43 outermost reaches 43 slender crescent 43 KH #D 43 Late Heavy Bombardment 43 Encke gap 43 waxing gibbous moon 43 Cassini Huygens spacecraft 43 equatorial regions 43 RX J# 43 cluster NGC 43 comet Hale Bopp 43 Cabeus 43 shepherding spacecraft 43 Coronal mass 43 Henize #-# 43 lightwaves 43 martian 43 cosmic ray flux 43 XO 3b 43 Kuiper Belt Object 43 planets circling 43 Syrtis Major 43 Quaoar 43 extraterrestrial civilizations 43 NASA Lunar Prospector 43 vortexes 43 hyperspace 43 dense neutron stars 43 atmospheric aerosols 43 magnetized plasma 43 Weakly Interacting Massive Particles 43 Kelvin Helmholtz 43 moon 43 S/# P2 43 gravitational microlensing 43 Romulan homeworld 43 Krimigis 43 Eagle Nebula 43 constellation Pisces 43 comet Hartley 2 43 muon neutrino 43 outermost planet 43 Jupiter icy moons 43 constellation Scorpius 43 spacecrafts 43 oxygen ions 43 Goldilocks planet 43 GPa 43 Cambrian Period 43 submillimeter galaxies 43 oblate spheroid 43 waxing crescent 43 magmas 43 aurorae 43 galaxy M# [002] 43 constellation Draco 43 celestial 43 periodic dimming 43 Carina Nebula 43 gravitational lenses 43 astrobiologists 43 Large Magellanic Cloud 43 planetary magnetospheres 43 Galaxy Evolution 43 craters 43 topological insulators 43 IRAS #-# 43 Neptune Uranus 43 Coronal Mass Ejections 43 Uranus Jupiter 43 Voyager probes 43 Martian craters 43 Astronomical Units 43 IKAROS 43 exerts gravitational pull 43 microplastics 43 distant quasars 43 lunar regolith 43 supercontinent 43 MG J# +# 43 spherules 43 planet Gliese #g 43 Particle physics 43 geostationary orbits 43 Orionids 43 AU Mic 43 Parallel universes 43 rubidium atoms 43 geyser plumes 43 outermost 43 habitable zones 43 universes 43 Rosette Nebula 43 alpha particles 43 Cassini flyby 43 Rydberg atom 43 wavefunction 43 Monoceros 43 electrons protons 43 quasicrystal 43 Comet Hale Bopp 43 binary asteroids 43 Neutrinos 43 topological defects 43 TrES 4