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(Click for frequent words.) 69 protoplanets 67 protoplanet 64 Kuiper belt objects 64 galactic disk 64 circumstellar 63 elongated orbits 63 Oort cloud 63 Hot Jupiters 63 circumstellar disk 63 protoplanetary disk 63 planetesimals 62 interstellar dust clouds 62 planetesimal 62 exosphere 61 blue supergiant 61 Neutron stars 61 Martian dust 61 lunar crust 61 energetic electrons 61 red supergiant 61 dwarf galaxy 61 planetary nebulae 60 jovian 60 gaseous planet 60 gravitational tugs 60 KBOs 60 infalling 60 planemos 60 interstellar cloud 59 Epsilon Eridani 59 gravitationally 59 comets orbiting 59 planets orbits 59 chondrules 59 supernova explosion 59 icy comets 59 extrasolar 59 interstellar dust grains 59 interstellar particles 59 sunlike stars 59 Planetary nebulae 59 silicate dust 59 micro meteorites 59 protoplanetary disks 58 HL Tau 58 Oort Cloud 58 galactic halo 58 interstellar clouds 58 WASP #b 58 millisecond pulsars 58 interstellar medium 58 accretion disk 58 sunlike star 58 martian atmosphere 58 magnetic dynamo 58 rotational axis 58 moonlets 58 infall 58 periodic dimming 58 ejecta 58 meteoroid impacts 58 blue straggler 58 moon Io 57 dense clumps 57 VY Canis Majoris 57 AU Mic 57 proplyds 57 planet magnetosphere 57 millisecond pulsar 57 magma ocean 57 proto galaxies 57 comets asteroids 57 gravitational interactions 57 nebular 57 protostar 57 lunar equator 57 comet McNaught 57 gravitational tides 57 accretion disks 57 cosmic ray particles 57 gravitational pulls 57 Upsilon Andromedae 57 type Ia supernova 57 Beta Pictoris 57 protostars 57 solar nebula 57 Saturn magnetosphere 57 Kuiper belt 56 gravitational interaction 56 meteoroids 56 cometary material 56 GJ #b [002] 56 Kuiper Belt Objects 56 protoplanetary 56 impactors 56 merging galaxies 56 dwarf galaxies 56 protoplanetary disc 56 neutron star 56 elliptical galaxy 56 comet nucleus 56 comet orbit 56 AGNs 56 photosphere 56 ionized particles 56 intrinsic brightness 56 Ulysses spacecraft 56 relativistic particles 56 planet WASP #b 56 meteoritic material 56 galaxies collide 56 terrestrial planets 56 ionized gas 56 coronal loops 56 Wolf Rayet star 56 retrograde orbit 56 comet tail 56 Murchison meteorite 56 AB Aurigae 56 planets 56 moonlet 56 neutralinos 56 X ray emission 56 circular orbits 56 planetary embryos 56 Io volcanoes 56 spherules 56 globulars 56 Trojan asteroids 56 magnetosphere 56 Jupiter magnetosphere 56 relativistic jets 55 Milky Way halo 55 post perovskite 55 mineral olivine 55 Alfven waves 55 BP Psc 55 supernova remnants 55 TrES 4 55 asteroidal 55 circumstellar disks 55 graphite whiskers 55 Magellanic Clouds 55 planet HD #b 55 metallicity 55 Shackleton crater 55 planetary orbits 55 planets asteroids 55 dirty snowballs 55 solar corona 55 tidally 55 dynamical evolution 55 meteoroid 55 galactic bulge 55 gravitational attraction 55 galaxies 55 permanently shadowed craters 55 cometary dust 55 Iapetus 55 airglow 55 ejecta blanket 55 helium atoms 55 superluminal 55 planetoids 55 gravitational wobbles 54 protoplanetary discs 54 interstellar dust 54 Comet Tempel Tuttle 54 Kuiper belt object 54 continental crust 54 Martian terrain 54 radial velocity technique 54 GJ#b 54 magnetic monopoles 54 Saturn rings 54 reflection nebula 54 cometary impacts 54 stellar nurseries 54 comets 54 sodium atoms 54 zodiacal dust 54 RX J# 54 Hyades cluster 54 ferric oxides 54 basaltic rocks 54 spherically symmetric 54 magnetars 54 SMBHs 54 ionized hydrogen 54 distant supernovae 54 coronal mass ejections CMEs 54 icy moons 54 gravitational slingshot 54 P/# A2 54 globular cluster 54 heliosphere 54 Pluto Charon 54 NASA Voyager spacecraft 54 collisional 54 NEAs 54 rocky planets 54 supermassive 54 Martian craters 54 Type Ia supernova 54 Cepheids 54 starburst galaxy 54 moon Enceladus 54 spinning neutron 54 Fornax cluster 54 albedo reflectivity 54 elliptical orbits 54 YORP effect 54 eccentric orbits 54 asthenosphere 54 hypervelocity stars 54 meridional flow 54 carbonate minerals 53 tidal tails 53 NGC# 53 Earth magnetosphere 53 rotational velocity 53 thermonuclear reactions 53 interstellar space 53 gaseous envelope 53 magnetic fields 53 filamentary structure 53 galactic clusters 53 globular clusters 53 Gravitational waves 53 comet Tempel Tuttle 53 polar vortex 53 Cosmic rays 53 HD#b 53 Zeta Ophiuchi 53 phyllosilicates 53 Kuiper Belt Object 53 SN #gy 53 CoRoT #b 53 binary asteroid 53 Fomalhaut b 53 Virgo Cluster 53 orbiting planets 53 Galactic cosmic rays 53 lithium atoms 53 Syrtis Major 53 planets Uranus 53 Bug Nebula 53 KH #D 53 distant quasar 53 Jovian moons 53 Galileo spacecraft 53 Milky Way Galaxy 53 Maunder minimum 53 Nasa spacecraft 53 planet Gliese #c 53 galactic cores 53 exoplanets orbiting 53 SMBH 53 Saturnian moons 53 axial tilt 53 equatorial latitudes 53 Bonneville Crater 53 planetary nebula 53 supercontinents 53 CAIs 53 BP Piscium 53 habitable zones 53 infalling gas 53 Bullet Cluster 53 hot Jupiters 53 lithosphere 53 redshifted 53 magnetospheric 53 G#.# +#.# 53 GJ #b [001] 53 eclipsing binary 53 SN#A 53 silicon monoxide 53 magnetar 53 Wolszczan 53 CoRoT satellite 53 moons orbiting 53 exoplanetary 53 Comet Halley 53 galaxy M# [002] 53 Earthlike planets 53 lobate scarps 53 gravitationally bound 52 galactic collisions 52 comet dust 52 meteorite impacts 52 tectonic uplift 52 subsurface ocean 52 comet nuclei 52 spacecraft flyby 52 nebulosity 52 lunar regolith 52 X ray binary 52 Samuel Oschin Telescope 52 lunar craters 52 galaxy clusters 52 observable universe 52 dusty disks 52 proto planetary disks 52 geoneutrinos 52 polar craters 52 supernova explosions 52 galactic mergers 52 silicates 52 rotating neutron stars 52 heliosheath 52 Antennae Galaxies 52 Andromeda galaxy 52 tidal bulge 52 luminous galaxies 52 exoplanet orbiting 52 red supergiants 52 Carina constellation 52 Evolution Explorer 52 heliospheric 52 galactic magnetic 52 cosmic strings 52 filamentary 52 crystalline silicates 52 galactic cosmic rays 52 lunar meteorites 52 moon Mimas 52 Sojourner rover 52 Epsilon Aurigae 52 constellation Hercules 52 sterile neutrinos 52 chromosphere 52 aerosol particles 52 Milankovitch cycles 52 highly elliptical orbits 52 Type Ia supernovas 52 pulsar 52 magnetotail 52 volcanic moon Io 52 Saturnian moon 52 exo planets 52 comet 52 Galilean moons 52 Kuiper Belt objects 52 Churyumov Gerasimenko 52 OGLE TR #b 52 magnetic polarity 52 magnetic flux 52 Earth radii 52 chondrites 52 elliptical galaxies 52 prograde 52 Sagittarius dwarf galaxy 52 mantle convection 52 olivine mineral 52 supermassive black holes 52 silicate mantle 52 layered outcrops 52 heavily cratered 52 Triangulum 52 starburst galaxies 52 gravitational microlensing 52 highly elliptical orbit 52 comet Churyumov Gerasimenko 52 retrograde orbits 52 Tharsis Rise 52 Lagoon Nebula 52 X ray binaries 52 vortices 52 proto cluster 52 Wolf Rayet stars 52 silicate rocks 52 TNOs 52 Trifid Nebula 52 radial velocity 52 ecliptic plane 52 ionised gas 52 Magellanic Stream 52 solitons 52 moon Ganymede 52 super Earths 51 gravitational perturbations 51 planets orbiting stars 51 stony meteorites 51 CoRoT 7b 51 starquakes 51 Orionid 51 Orion nebula 51 XO 3b 51 Pleiades cluster 51 Supernova #A 51 filamentary structures 51 Quadrantid 51 moonquakes 51 hydrogen nuclei 51 Mini TES 51 Venusian atmosphere 51 HIP #b 51 Higgs bosons 51 XTE J# 51 quasars 51 sunward 51 Bok globules 51 inner moons 51 planet orbiting 51 SN #C 51 HD #b [001] 51 spicules 51 gaseous planets 51 APXS 51 Computer simulations 51 gravitational instabilities 51 lunar highlands 51 nebula 51 constellation Taurus 51 gravitational 51 J# +# [002] 51 Corot 7b 51 blackholes 51 Astrophysicists 51 colliding galaxies 51 ellipsoids 51 tholins 51 martian meteorites 51 Martian gullies 51 GQ Lupi 51 Rosette Nebula 51 Reiner Gamma 51 Toutatis 51 cosmological distances 51 W bosons 51 X ray emitting 51 Martian meteorites 51 elemental abundances 51 tectonic plate movements 51 Cancri e 51 perihelion 51 celestial bodies 51 magnetized plasma 51 Geminga 51 constellation Cetus 51 Earth thermosphere 51 transiting exoplanet 51 inner asteroid belt 51 Sedna 51 cosmic phenomena 51 Kepler #b 51 inner Oort Cloud 51 magnetopause 51 Yarkovsky effect 51 accreting 51 planets orbiting distant 51 stellar occultation 51 silicate minerals 51 microscopic specks 51 regolith 51 type Ia supernovae 51 coronagraph 51 V# Mon 51 equatorial regions 51 supernovas 51 outer crust 51 Gerard Kuiper 51 distant supernovas 51 micrometeoroids 51 hematite mineral 51 nucleosynthesis 51 carbonaceous chondrite 51 Gliese #e 51 WMAP satellite 51 outer planets 51 particles 51 coronal loop 51 lensing galaxy 51 MG J# +# 51 lowermost mantle 51 gravitational waves 51 comet particles 51 RS Ophiuchi 51 yardangs 51 baryonic 51 crustal plates 51 Upsilon Andromedae b 51 Hellas Basin 51 electron neutrinos 51 IRC +# 51 convective 51 synchronous orbit 51 Comet 9P/Tempel 1 51 supercontinent 51 Red Rectangle 51 Allende meteorite 51 meteorite bombardment 51 giant elliptical galaxies 51 spacetime 50 weakly interacting 50 matter antimatter annihilation 50 Phoebe orbits 50 evanescent waves 50 seafloor sediment 50 Delta Cephei 50 Kuiper Belt object 50 elliptical galaxy NGC 50 active galactic nuclei 50 asteroid impacts 50 wrinkle ridges 50 ionised 50 Jupiter moon Io 50 transiting planets 50 deep convective clouds 50 Large Magellanic Cloud 50 inhomogeneities 50 constellation Puppis 50 galaxy 50 Earth ionosphere 50 Earthlike 50 dwarf spheroidal galaxies 50 antineutrinos 50 planet Gliese #g 50 interstellar grains 50 Io Europa 50 muons 50 overlying layers 50 pions 50 spatially resolved 50 volcanic lava flows 50 gravitational tug 50 GRBs 50 Earth biosphere 50 cobalt atom 50 constellation Cassiopeia 50 innermost planet 50 Henize #-# 50 Martian meteorite 50 concretions 50 cometary 50 supergiant star 50 water vapor 50 Dwarf galaxies 50 chemical abundances 50 planet orbits 50 cratons 50 Saturn outermost ring 50 planetoid 50 zodiacal light 50 lithospheric 50 Gravitational 50 supersymmetric particles 50 galaxy M# [001] 50 atmospheric aerosols 50 spherical halo 50 globular star 50 Eridani 50 Gusev crater 50 Eagle Nebula 50 particles WIMPs 50 meteor impacts 50 Jupiter moons 50 molten magma 50 neutron stars 50 Omega Centauri 50 Hanny Voorwerp 50 astrophysical objects 50 runaway thermonuclear 50 moons Europa 50 Einstein relativity theory 50 prominences 50 orbital eccentricity 50 Earthlike planet 50 HiRISE image 50 Proxima Centauri 50 sulfate aerosols 50 Cepheid variables 50 substorm 50 Cometary 50 planetary atmospheres 50 Viking Lander 50 antimatter particles 50 Milankovitch 50 martian rocks 50 orbital velocity 50 constellation Eridanus 50 rifting 50 Scorpii 50 spheroidal 50 SN #A 50 nebulae 50 Fermi telescope 50 cosmic cannibal 50 Crab Pulsar 50 trans Neptunian objects 50 subatomic particles 50 supernovae explosions 50 zinc sulfide 50 baryonic matter 50 nucleon 50 interplanetary dust 50 supergiants 50 Milky Way galaxy 50 ENAs 50 celestial sphere 50 mineral hematite 50 PSR J# 50 Hipparcos 50 unconventional superconductivity 50 transiting planet 50 diffraction patterns 50 planet Uranus 50 planetary magnetospheres 50 planets orbiting sun 50 Gondwana supercontinent 49 dust particles 49 icy moon Enceladus 49 R Coronae Borealis 49 Mercury exosphere 49 eclipsing binaries 49 martian surface 49 Ring Nebula 49 Ares Vallis 49 Martian volcanoes 49 brown dwarfs 49 Solar System 49 precessing 49 sized planets orbiting 49 constellation Ursa Major 49 reionization 49 Garrick Bethell 49 galaxy cluster 49 chondritic 49 Jupiter gravitational pull 49 magnetic monopole 49 binary asteroids 49 elongated orbit 49 Voyager probes 49 lava tubes 49 gibbous 49 bolide 49 NGC #A 49 supermassive stars 49 planets orbiting 49 emit X rays 49 Martian rocks 49 outer layers 49 spiral galaxy NGC 49 Helix Nebula 49 gamma ray photons 49 HM Cancri 49 solar radii 49 shadowed craters 49 asteroids 49 planets moons 49 galaxy formation 49 HD #b [002] 49 Comet Encke 49 scarps 49 Jovian moon 49 Type 1a supernovae 49 faintest galaxies 49 matter antimatter asymmetry 49 penumbral shadow 49 meteoritic 49 Voyager spacecraft 49 lunar soil 49 Lyman alpha 49 GRB # 49 galaxy NGC 49 flood basalts 49 Orion constellation 49 interstellar dust particles 49 BLG #Lb 49 ringed planet 49 Valles Marineris 49 extrasolar planets orbiting 49 Endurance Crater 49 Beta Pictoris b 49 axions 49 submillimeter galaxies 49 IBEX spacecraft 49 geyser plumes 49 COROT 7b 49 galactic cosmic radiation 49 supernovae 49 spectral measurements 49 moon gravitational pull 49 cometary debris 49 Mercury magnetosphere 49 orbits 49 binary quasar 49 olivine 49 HARPS instrument 49 Spitzer infrared spectrograph 49 spinning neutron stars 49 cosmic rays 49 supernova 49 microlensing events 49 Martian atmosphere 49 outermost planets 49 filaments 49 distant galaxies 49 Cosmologists 49 atmospheric circulations 49 reentry capsule 49 quantum tunneling 49 sedimentary deposits 49 Nili Fossae 49 Martian rovers 49 IRAS #-# 49 extrasolar planetary systems 49 faraway galaxies 49 distant galaxy 49 Mott insulators 49 tectonic movements 49 stellar occultations 49 exosolar planets 49 downwelling 49 Cabeus crater 49 supernova SN 49 oceanic currents 49 exo planet 49 Martian crater 49 CoRoT 9b 49 X ray wavelengths 49 Supernovae 49 SNe 49 particles emitted 49 Monoceros 49 geostationary orbits 49 mantle plumes 49 Tempel Tuttle 49 planetary transits 49 exoplanets 49 cosmic ray 49 stony meteorite 49 hypervelocity star 49 chondritic meteorites 49 Saturn aurora 49 orbital resonance 49 galactic cosmic ray 49 sedimentary layers 49 orbits Saturn 49 deuterium 49 nucleons 49 Crab pulsar 49 stellar seismology 49 gravitational tidal 49 Saharan dust 49 asteroseismology 49 Caloris Basin 49 quasar 49 orbital inclination 49 interacting galaxies 49 hydrosphere 49 Type Ia 49 isostatic rebound 49 quartz grains 49 constellation Coma Berenices 49 moons Phobos 49 Quaoar 49 planetary surfaces 49 hydrogen helium 49 rock outcrop 49 dipole moment 49 Laurentide ice sheet 49 igneous rock 49 impactor spacecraft 49 X ray afterglow 49 Kepler 9c 49 icy crust 49 planetary geologists 48 Globular clusters 48 Shepherding Spacecraft 48 PSR J# +# 48 habitable planets 48 ULIRGs 48 antiprotons 48 electrons orbiting 48 supergiant stars 48 radioactive decay 48 transiting exoplanets 48 spinning clockwise 48 dust enshrouded 48 Mossbauer spectrometer 48 supernova remnant 48 martian soil 48 hypervelocity 48 hydroxyl molecules 48 Gal Yam 48 Itokawa 48 Coma Cluster 48 Martian crust 48 phyllosilicate 48 Meridiani 48 Cosmic Microwave Background 48 stratospheric clouds 48 asteroid 48 Saturnian 48 spiral galaxies 48 cirrus cloud 48 HII regions 48 SN #D 48 smallest exoplanet 48 asteroid belt 48 constellation Centaurus 48 Saturnian system 48 Pluto Eris 48 neighboring Andromeda galaxy 48 Arches Cluster 48 Cepheid variable 48 ejecta plume 48 KT boundary 48 argon atoms 48 calcite crystals 48 silicate grains 48 elemental composition 48 NASA satellites orbiting 48 anorthosite 48 constellation Virgo 48 convective clouds 48 Tauri Sb 48 multi celled 48 basaltic magma 48 SIRTF 48 moon Dione 48 highly magnetized neutron 48 spacecraft thrusters 48 supermassive black hole 48 Viking orbiters 48 isotopic ratios 48 aeolian 48 galaxy redshift 48 Alfvén waves 48 Carina Nebula 48 Doppler measurements 48 #P/Churyumov-Gerasimenko 48 micrometeoroid impacts 48 cosmic ray flux 48 giant elliptical galaxy 48 cosmic collisions 48 Sedimentary rocks 48 olivine crystals 48 radiative 48 spicule 48 nanopillars 48 earthlike planets 48 outermost layers 48 Shoemaker Levy 48 sterile neutrino 48 X ray telescopes 48 hydrated minerals 48 strange quark 48 Cassini spacecraft orbiting 48 gamma rays emitted 48 convection currents 48 exoplanetary systems 48 electron orbits 48 Saturn auroras 48 dust devils 48 Trifid 48 primordial ingredients 48 hydrocarbon haze 48 Tagish Lake meteorite 48 Mojzsis 48 novae 48 Milky Way 48 midlatitudes 48 ionized gases 48 Asteroid Belt 48 fainter objects 48 neutron spectrometer 48 telescope eyepiece 48 Solar flares 48 helium nuclei 48 extrasolar planets 48 Cat Paw Nebula 48 ultracold atoms 48 solar prominences 48 hydrostatic equilibrium 48 Pulsars 48 deuterium atoms 48 neutrino particles 48 Great Conveyor Belt 48 constellation Scorpius 48 Eta Carinae 48 earthlike 48 polar latitudes 48 QQ# 48 occultations 48 carbonaceous chondrites 48 WIMPs 48 planet gravitational tug 48 crustal 48 spectroscopically 48 planetary Transits 48 Active Galactic Nuclei 48 gravitational radiation 48 lunar magma 48 Martian dunes 48 astronomers 48 Comet Hartley 2 48 angular momentum 48 mesocyclone 48 Candor Chasma 48 HD# [002] 48 X ray observatory 48 exoplanets planets 48 cosmic ray intensity 48 Galilean satellites 48 Doppler shift 48 Corot 9b 48 meteorite fragments 48 isotopic compositions 48 coronal mass ejection 48 ionosphere 48 gamma ray emission 48 ellipsoid 48 ion flux 48 constellation Andromeda 48 baryon 48 Neoproterozoic 48 sidereal 48 Extrasolar planets 48 zodiac constellations 48 lavas 48 robotic lander 48 Virgo cluster 48 polaritons 48 Astronomers 48 permanently shadowed regions 48 Magnetars 48 explosive volcanism 48 Astronomical Units 48 circumstellar dust 48 electron density 47 quantum particle 47 Orion Nebula 47 nebula NGC 47 sediments deposited 47 synchrotron emission 47 prebiotic molecules 47 Stardust spacecraft 47 Alycia Weinberger 47 Noachian era 47 outflowing 47 polar caps 47 faint galaxies 47 atmospheric convection 47 astrometry 47 strangelet 47 icesheet 47 Kazantzidis 47 SDSS II 47 emission nebula 47 velocity dispersion 47 unmanned probes 47 Mandushev 47 proton proton collisions 47 retroreflector 47 atoms 47 silicate crystals 47 radial velocity method 47 Elysium Planitia 47 coronal holes 47 Saturn Cassini 47 isotope fractionation 47 quasiparticles 47 SNR #-#.# 47 interstellar 47 Bose Einstein condensates 47 Antiope 47 microquasar 47 permanently shadowed 47 muon neutrino 47 Baptistina 47 Comet Machholz 47 particle acceleration 47 lightwaves 47 earth crust 47 Jupiter Ganymede 47 spinning pulsar 47 Earth objects NEOs 47 VHE gamma rays 47 northern arctic plains 47 MPc 47 cumulus cloud 47 carbon cenospheres 47 Type Ic supernovae 47 potentially habitable planets 47 Doppler shifts 47 globular cluster M# 47 Andromeda halo 47 volcanic plumes 47 crustal thickness 47 Mars landers 47 moons circling 47 constellation Aquarius 47 RRATs 47 IKAROS 47 Viking landers 47 Eridanus