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(Click for frequent words.) 73 magnetosphere 70 heliosheath 68 Earth magnetosphere 67 heliopause 65 magnetotail 64 galactic magnetic 64 Saturn magnetosphere 64 interstellar medium 64 exosphere 63 heliospheric 63 galactic cosmic rays 63 Kuiper belt 63 Oort Cloud 63 interstellar space 63 Oort cloud 62 photosphere 61 solar corona 61 spacetime 61 innermost planet 61 comet nucleus 60 magnetospheric 60 magnetic reconnection 60 solar nebula 60 protoplanetary disk 60 interstellar cloud 60 GJ#b 60 observable universe 60 ionized gas 59 magnetopause 59 Milky Way Galaxy 59 Fomalhaut b 59 X ray emission 59 gaseous planet 59 chromosphere 59 planet magnetosphere 58 celestial sphere 58 thermosphere 58 Gravitational waves 58 interstellar boundary 58 mesosphere 58 nebula 58 Solar System 58 planetesimals 58 Earth ionosphere 58 ejecta 58 infrared wavelengths 58 ionosphere 57 Milky Way galaxy 57 electron density 57 gravitational 57 accretion disk 57 Yarkovsky effect 57 sodium atoms 57 HD#b 57 meridional flow 57 galactic disk 57 filamentary structure 57 Kuiper Belt 57 lunar crust 57 Saturn rings 57 polar vortex 56 gravitational interaction 56 neutron star 56 magnetic fields 56 GJ #b [002] 56 circumstellar 56 galaxies 56 Kuiper belt objects 56 Andromeda galaxy 56 galaxy clusters 56 Upsilon Andromedae 56 circumstellar disk 56 Interstellar Boundary Explorer 56 Jupiter magnetosphere 56 magnetar 56 interstellar clouds 56 rotational axis 56 cosmic rays 56 moon Enceladus 55 elliptical orbits 55 galaxy 55 cosmic microwave background 55 terrestrial planets 55 planets 55 Ulysses spacecraft 55 IBEX spacecraft 55 moon Io 55 distant galaxies 55 planetary nebulae 55 WASP #b 55 planets orbits 55 magma ocean 55 supernova explosion 55 jovian 55 protostar 55 electron neutrinos 55 gravity warps 55 P/# A2 55 elongated orbits 55 wrinkle ridges 55 comet 55 lithosphere 55 galactic bulge 55 planet Uranus 55 Corot 9b 55 moon Mimas 55 ringed planet 55 perihelion 55 protoplanet 55 Corot 7b 55 heavily cratered 55 substorms 55 extrasolar 55 YORP effect 55 tropopause 54 diffraction pattern 54 ULIRGs 54 cometary debris 54 Crab Pulsar 54 planets orbiting stars 54 Hubble observations 54 distant galaxy 54 Milky Way halo 54 Cancri e 54 Alfven waves 54 infrared radiation 54 gravitational attraction 54 constellation Ursa Major 54 Saturnian system 54 Mimas 54 ejecta blanket 54 cosmic ray particles 54 interstellar dust 54 corona 54 electron orbits 54 Eta Carinae 54 Earth radii 54 proto planetary disk 54 cometary material 54 supergiant star 54 Venusian atmosphere 54 Crab Nebula 54 elliptical galaxies 54 proplyds 54 substorm 54 supernova remnant 54 quasar 54 lensing galaxy 54 galactic halo 54 outer planets 53 asthenosphere 53 Martian atmosphere 53 AB Aurigae 53 phyllosilicates 53 exoplanetary 53 Churyumov Gerasimenko 53 icy moons 53 BP Psc 53 zodiacal light 53 Galileo spacecraft 53 Haumea 53 Saturnian 53 interstellar dust grains 53 gravitational waves 53 interstellar magnetic 53 Saturnian moon 53 double helix nebula 53 X ray wavelengths 53 quark gluon plasma 53 Iapetus 53 baryon 53 AGNs 53 dwarf galaxy 53 elongated orbit 53 GJ #b [001] 53 Voyager spacecraft 53 Magnetic Imager HMI 53 Kuiper Belt Objects 53 potentially habitable planets 53 superfluid 53 fainter objects 53 metallicity 53 polar regions 53 permanently shadowed craters 53 Kepler #b 53 comet orbit 53 Red Rectangle 53 HL Tau 53 anomalous cosmic rays 53 SN #A 53 cosmos 53 atomic nucleus 53 gravitational lens 53 planet orbits 53 planetary orbits 53 Earth magnetotail 53 asteroidal 53 moonlet 53 extrasolar planets 53 Upsilon Andromedae b 53 radiative 53 martian atmosphere 53 comets asteroids 53 galaxy cluster 53 retrograde orbit 53 ultraviolet radiation emitted 53 Comet Lulin 53 eccentric orbits 53 habitable zones 53 comets 53 magnetic polarity 53 gravitationally 53 HM Cancri 53 visible wavelengths 52 orbits 52 planetoid 52 coronal loops 52 airglow 52 antiparticle 52 COROT 52 Eagle Nebula 52 Orion Nebula 52 post perovskite 52 CoRoT satellite 52 gravitational radiation 52 cosmological distances 52 Henize #-# 52 Itokawa 52 pions 52 circumstellar disks 52 spherical halo 52 gravitational lensing 52 cosmic radiation 52 celestial equator 52 Hanny Voorwerp 52 Syrtis Major 52 nebular 52 accretion disks 52 Gliese #e 52 infall 52 strange quark 52 Epsilon Aurigae 52 Comet Holmes 52 quantum particle 52 Valles Marineris 52 stellar nurseries 52 extrasolar planetary systems 52 cometary 52 gamma rays 52 Milky Way 52 Cosmic Microwave Background 52 Saturn moon Enceladus 52 TrES 4 52 Virgo Cluster 52 orbital resonance 52 Epsilon Eridani 52 Antennae Galaxies 52 luminous galaxies 52 universe 52 comets orbiting 52 Ithaca Chasma 52 meteoroids 52 Saturn moon Mimas 52 supernova explosions 52 icy comets 52 Pluto Charon 52 Mercury magnetosphere 52 planets Uranus 52 moon gravitational pull 52 detect gravitational waves 52 intrinsic brightness 52 Uranus 52 distant supernovas 52 rocky planets 52 interstellar particles 52 comet tail 52 vortices 52 highly elliptical orbit 52 reionization 52 Toutatis 52 helium atoms 52 polar craters 52 planemos 52 Jupiter moon Io 52 planets comets 52 distant supernovae 52 gravitational pulls 52 exo planets 51 brown dwarfs 51 Mandushev 51 ecliptic plane 51 volcanic plumes 51 brown dwarf 51 Alfvén waves 51 exoplanetary systems 51 Evolution Explorer 51 constellation Virgo 51 impactors 51 Cassini flyby 51 protoplanetary disks 51 elliptical galaxy 51 cosmic ray 51 Enceladus 51 troposphere 51 moons orbiting 51 Kuiper Belt objects 51 quasars 51 supernova remnants 51 EPOXI 51 ionized particles 51 energetic electrons 51 auroral displays 51 galactic cosmic ray 51 star Proxima Centauri 51 inner asteroid belt 51 Hot Jupiters 51 galaxy M# [001] 51 coronagraph 51 quasicrystal 51 GRBs 51 grabens 51 spectroscopic measurements 51 Galaxy Evolution 51 elliptical orbit 51 SOHO spacecraft 51 Shackleton crater 51 Epoxi 51 GQ Lupi 51 nuclei 51 asteroid belt 51 basaltic rocks 51 collisional 51 Earthlike planet 51 HD #b [002] 51 Gliese #c 51 redshifted 51 cosmic ray flux 51 Wolszczan 51 relativistic particles 51 high redshift galaxies 51 planetary Transits 51 HiRISE image 51 antiferromagnets 51 magnetization 51 gamma ray burst 51 chondrules 51 KBOs 51 Gravitational lensing 51 CoRoT 9b 51 elemental abundances 51 meteoroid 51 electrons orbiting 51 Comet Hartley 2 51 sunlike star 51 VY Canis Majoris 51 Mpc 51 XMM Newton 51 Jovian moons 51 reflection nebula 51 neutrino mass 51 Saturn Cassini 51 Martian dust 51 gravitational microlensing 51 cosmological parameters 51 cosmic cannibal 51 spiral galaxy 51 magma chambers 51 magnetic flux 51 planetary nebula 51 type Ia supernova 51 aurora 51 NASA Interstellar Boundary 51 supermassive black hole 51 asteroid Vesta 51 outer corona 51 planet Gliese #c 51 axions 50 nucleons 50 Cabeus 50 mantle plumes 50 redshift 50 earthshine 50 CMB radiation 50 tidally 50 outer heliosphere 50 Explorer WISE 50 starburst galaxy 50 smoggy atmosphere 50 auroral 50 CMB photons 50 galaxy formation 50 spherical particle 50 angular momentum 50 tholins 50 baryons 50 neutron stars 50 eclipsing binary 50 spacecraft flyby 50 Higgs particle 50 HUDF 50 exoplanets planets 50 Type Ia supernova 50 spectroscopically 50 exoplanets 50 hydrogen atoms 50 Goldilocks planet 50 quantum tunneling 50 constellation Eridanus 50 exoplanet 50 Tarantula Nebula 50 pulsar 50 antimatter particles 50 red supergiants 50 Bullet Cluster 50 Saturnian moons 50 atmospheric circulation 50 photons 50 planetary embryos 50 exciton 50 martian surface 50 Hawking radiation 50 Galilean moons 50 celestial bodies 50 Andromeda Galaxy 50 transiting exoplanet 50 interstellar dust clouds 50 gravitational tugs 50 merging galaxies 50 Anisotropy Probe 50 retrograde orbits 50 arcminutes 50 excitons 50 comet nuclei 50 cosmic microwave radiation 50 elliptical galaxy NGC 50 astronomical objects 50 penumbral shadow 50 G#.# +#.# 50 galaxy NGC 50 neutralinos 50 CoRoT 7b 50 AU Mic 50 protoplanets 50 Einstein theory 50 magnetic monopoles 50 occultations 50 continental crust 50 infrared wavelength 50 subsurface ocean 50 Earthlike 50 SN #gy 50 blue supergiant 50 umbra 50 ENAs 50 exoplanet orbiting 50 CoRoT #b 50 planets moons 50 geoneutrinos 50 planet transits 50 red supergiant 50 water vapor 50 outer layers 50 Galilean satellites 50 sunspot cluster 50 spherically symmetric 50 gamma ray observatory 50 atomic nuclei 50 Keck Interferometer 50 constellation Cassiopeia 50 exosolar planets 50 velocity dispersion 50 biosphere 50 foreground galaxy 50 cosmic magnifying glass 50 noctilucent clouds 50 cometary dust 50 iron pnictides 50 pseudogap 50 Svedhem 50 aerosol particles 50 constellation Taurus 50 X ray pulses 50 moon Charon 50 stellar occultations 50 Stephan Quintet 50 subatomic particle 50 photon energies 50 dipole moment 50 active galactic nucleus 50 Kuiper Belt object 50 geospace 50 Jupiter Saturn Uranus 50 Large Magellanic Cloud 50 ionized hydrogen 50 polar caps 50 Comet Churyumov Gerasimenko 50 binary asteroids 50 Comet #P/Churyumov-Gerasimenko 50 silicate dust 50 perigee 50 Endurance crater 50 plasmons 50 astrophysical objects 50 diffraction patterns 50 #P/Churyumov-Gerasimenko 50 deep convective clouds 50 Methone 50 Wolf Rayet star 50 globular cluster 50 subatomic scale 50 starburst galaxies 50 planet Gliese #g 50 WMAP satellite 50 active galactic nuclei 50 astrophysical 50 Arches Cluster 50 Saturn Uranus 50 carbonate minerals 50 galactic equator 50 infalling 50 Olympus Mons 50 gravitational lenses 49 cryosphere 49 Orion nebula 49 gamma ray emitting 49 Mercury flyby 49 celestial object 49 gravitational wave 49 Cosmologists 49 wavefunction 49 RY Sagittarii 49 planetary surfaces 49 Candor Chasma 49 gravitational interactions 49 Saturnian moon Titan 49 auroral oval 49 solitons 49 Zeta Ophiuchi 49 Neutron stars 49 X ray telescopes 49 Earthlike planets 49 Casimir cavity 49 oblate spheroid 49 BLG #Lb 49 cometary nucleus 49 Hellas Basin 49 hydroxyl molecules 49 Gerard Kuiper 49 protoplanetary 49 anisotropy 49 permanently shadowed 49 THEMIS 49 helium atom 49 Milankovitch cycles 49 RXTE 49 Carina Nebula 49 VIRTIS 49 torus 49 X ray observatory 49 Kuiper Belt mysterious 49 globulars 49 Beta Pictoris b 49 nebulae 49 hypervelocity stars 49 submillimeter galaxies 49 ellipsoid 49 gaseous planets 49 meteoritic material 49 filamentary structures 49 Martian polar 49 plasmasphere 49 Jovian moon 49 morphological evolution 49 circular orbits 49 RHESSI 49 equator 49 WMAP 49 graphene sheet 49 chlorophyll molecules 49 hydrological cycle 49 NASA Cassini spacecraft 49 ultraviolet wavelengths 49 planet orbiting 49 Helix Nebula 49 Virgo cluster 49 superluminal 49 optical wavelengths 49 NASA STEREO 49 type Ia supernovae 49 electron diffusion 49 Fermi telescope 49 supermassive stars 49 orbits Saturn 49 Kuiper belt object 49 muon neutrino 49 Saturn moons 49 albedo 49 coronal mass ejection 49 interstellar 49 prominences 49 dynamical evolution 49 distant quasars 49 submillimeter 49 millisecond pulsar 49 SNR #-#.# 49 electron orbitals 49 Betelgeuse 49 Cepheid variables 49 axion 49 moonlets 49 Borealis basin 49 MESSENGER spacecraft 49 Beta Pictoris 49 supermassive black holes 49 astronomers 49 Type Ia supernovas 49 atomic particles 49 barred spiral galaxy 49 oceanic circulation 49 HIP #b 49 surface plasmons 49 Relations Observatory STEREO 49 electron pairs 49 exoplanets orbiting 49 Veil Nebula 49 atmospheric circulations 49 particle acceleration 49 MESSENGER 49 zodiacal dust 49 SDSS II 49 APXS 49 GRB #B 49 matter antimatter asymmetry 49 proto galaxies 49 aurorae 49 Extreme Ultraviolet Variability Experiment 49 GPa 49 millimeter wavelength 49 RS Ophiuchi 49 Krimigis 49 yardangs 49 superlens 49 polaritons 49 quantum superposition 49 hydrogen nuclei 49 aphelion 49 numerical simulations 49 crystallites 49 electron ion 49 cryovolcanism 49 Galactic cosmic rays 49 atoms 49 Elysium Planitia 49 Omega Centauri 49 galactic 49 SN#A 49 Wilkinson Microwave Probe 49 planet HD #b 49 antiproton 48 Lagoon Nebula 48 bilayer graphene 48 constellation Andromeda 48 SMBH 48 constellation Aquarius 48 sterile neutrino 48 supernova 48 EPOCh 48 orbital eccentricity 48 hydrosphere 48 Wolf Rayet stars 48 geomagnetic 48 polar 48 mantle convection 48 bilayer 48 galactic mergers 48 Konacki 48 Kepler 9c 48 Cabeus crater 48 slender crescent 48 Delta Cephei 48 transiting planet 48 mineral olivine 48 Rayleigh scattering 48 geoid 48 Planck telescope 48 Pluto Eris 48 cosmic collisions 48 gravitationally bound 48 TrES 48 nebulosity 48 Lagrangian 48 Tharsis Rise 48 outer layer 48 nanotube 48 Cassini ion 48 spherical shape 48 comet Tempel Tuttle 48 filaments 48 planets orbiting 48 umbral shadow 48 sextile 48 periodicities 48 Earth biosphere 48 extrasolar planet 48 protons 48 high temperature superconductivity 48 ecliptic 48 constellation Centaurus 48 mid latitudes 48 Sedna 48 nucleon 48 gaseous envelope 48 Itokawa asteroid 48 KH #D 48 equatorial bulge 48 planetary magnetospheres 48 comet McNaught 48 silicon monoxide 48 supersymmetric particles 48 sunspots 48 topological defects 48 ESA Integral 48 J# +# [002] 48 ESA Mars 48 Phoebe orbits 48 hot Jupiters 48 Gusev crater 48 micrometer scale 48 Cat Paw Nebula 48 dynamical 48 Victoria Crater 48 globular star 48 faintest galaxies 48 ITCZ 48 globular clusters 48 advection 48 Cepheids 48 Caloris Basin 48 cosmological theories 48 general relativity 48 moons Phobos 48 coronal mass ejections 48 ESA Cluster 48 Comet #P 48 martian 48 quasiparticle 48 impactor 48 gravitational tug 48 Bok globules 48 Fornax cluster 48 Cassini Huygens 48 superheavy elements 48 HARPS instrument 48 vesicle 48 coronal heating 48 prograde 48 emission nebula 48 SINFONI 48 brane 48 sunlike stars 48 photonic crystal 48 Io Europa 48 dense clumps 48 Jupiter Ganymede 48 nanobubbles 48 weakly interacting 48 weak gravitational lensing 48 Sagittarius B2 48 spatially resolved 48 galactic nuclei 48 RX J# 48 phonons 48 Voorwerp 48 nanomesh 48 spectroscopic analysis 48 landforms 48 comet Churyumov Gerasimenko 48 relativistic jets 48 spicules 48 dimer 48 lunar perigee 48 Planetary nebulae 48 atmospheric convection 48 Lyman alpha 48 Explorer IBEX 48 biosignatures 48 cosmic ray intensity 48 Huygens mission 48 radial velocity method 48 Kepler telescope 48 galactic cores 48 planetesimal 48 neighboring Andromeda galaxy 48 largest moon Charon 48 Solar TErrestrial RElations Observatory 48 oxygen ions 48 Arsia Mons 48 inhabitable planets 48 arcseconds 48 Adam Riess 48 smallest exoplanet 48 quantum correlations 48 TGFs 48 V# Mon 48 de Pater 48 spiral galaxies 48 ionised gas 48 Saturn outermost moon 48 GRB# 48 Great Conveyor Belt 48 gamma ray bursts 48 galactic clusters 48 toroid 48 Jupiter Uranus 48 Peony nebula star 48 subglacial lake 48 circular orbit 48 outermost layer 48 Martian terrain 48 kaons 48 LORRI 48 Geminga 48 planetary 48 Isidis Planitia 48 galactic alignment 48 cosmological constant 48 magnetosomes 47 Magellanic Clouds 47 moon Titan 47 Comet McNaught 47 baryonic matter 47 Rydberg atom 47 neutrino 47 solar irradiance 47 X ray Observatory 47 rubidium vapor 47 Europa Ganymede 47 crustal 47 dwarf galaxies 47 Nasa spacecraft 47 Rossby waves 47 sundog 47 Jupiter Saturn 47 Ringed Planet 47 coronal loop 47 nucleosynthesis 47 crystal lattice 47 Solar Dynamics Observatory 47 millimeter wavelengths 47 sunspot cycle 47 radial velocity measurements 47 gravitational slingshot 47 luminosities 47 planetoids 47 habitable planets 47 Cassini Huygens spacecraft 47 spherules 47 gravitational tidal 47 neutrinos 47 magnetic substorms 47 extragalactic 47 Giovanni Cassini 47 spatial dimensions 47 Neptune Uranus 47 Coma cluster 47 Jacques Laskar 47 absorbs photons 47 NEAs 47 icy crust 47 outermost planets 47 Mercury exosphere 47 Manned missions 47 refracts light 47 Samuel Oschin Telescope 47 spacecraft Cassini 47 meteorite impacts 47 Cerenkov radiation 47 Comet Hartley 47 stellar occultation 47 antiparallel 47 X ray binary 47 auroras 47 filamentary 47 magnetization reversal 47 bosonic 47 ultracold atoms 47 Heliospheric Observatory SOHO 47 tiniest particles 47 planet Nibiru 47 HD #b [001] 47 lightwaves 47 Proxima Centauri 47 radial velocity 47 Rosette Nebula 47 Comet Machholz 47 Comet Elenin 47 lunar craters 47 spiral galaxy NGC 47 spectral fingerprint 47 Yinghuo 1 47 imaging spectrometer 47 impactor spacecraft 47 constellation Carina 47 Astrophysicists 47 cuprate superconductors 47 exo planet 47 Martian crater 47 undersea volcanoes 47 rotational velocity 47 helium nuclei 47 microtubules 47 gravitational pull 47 emit X rays 47 diffuse aurora 47 outermost 47 Comet Tempel Tuttle 47 arcsecond 47 Coma Cluster 47 Cassini Regio 47 magnetospheres 47 asteroseismology 47 equatorial latitudes 47 photoemission 47 W boson 47 Planck satellite 47 asteroid Lutetia 47 GALEX 47 cosmic phenomena 47 constellation Scorpius 47 Shackleton Crater 47 auxin 47 Quaoar 47 Martian equator 47 infrared laser beam 47 journal Icarus 47 magnetic dynamo 47 Mössbauer 47 ray Space Telescope 47 star Spica 47 Bug Nebula 47 solar flares 47 Orientale Basin 47 planetary nebulas 47 fissure eruption 47 orbital velocity 47 star Fomalhaut 47 HII regions 47 carbonate globules 47 stratospheric ozone 47 protostars 47 quantum mechanical 47 cosmologists 47 Quentin Tarantino Waltz 47 Bose Einstein condensates 47 Caloris 47 outermost layers 47 electron spins 47 SIRTF 47 colloidal crystals 47 OSIRIS REx 47 GeV 47 comet Hartley 2 47 convective 47 sterile neutrinos 47 crustal thickness 47 submillimeter wavelengths 47 volcanic plume 47 nanodot 47 gravitons 47 redshifts 47 Wilkinson Microwave Anisotropy Probe 47 telescopic observations 47 intracluster 47 relativity theory 47 Orion constellation 47 longwave radiation 47 Caloris basin 47 planet HD#b 47 periodic dimming 47 electrons 47 GRB # 47 constellation Pisces 47 Z boson 47 blue straggler 47 auroral activity 47 Trifid Nebula 47 habitable worlds 47 constellation Leo 47 Vourlidas 47 Higgs singlet 47 lavas 47 potassium atoms 47 proton decay 47 Tempel 1 47 Comet LINEAR 47 dirty snowballs 47 Saturn Enceladus 47 Small Magellanic Cloud 47 graphite whiskers