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(Click for frequent words.) 60 asteroid 59 asteroid impacts 59 comets asteroids 59 comet 58 Jupiter moon Io 58 meteoroid 58 Saturn moon Mimas 57 accretion disks 57 Saturnian moon 57 comet nucleus 57 circumstellar 57 asteroids 57 distant supernovae 56 inhabitable planets 56 moon Enceladus 56 exoplanets orbiting 56 Kuiper belt objects 56 Ulysses spacecraft 56 Fomalhaut b 56 Type Ia supernovas 56 Upsilon Andromedae 56 comet Shoemaker Levy 56 Gravitational waves 56 galactic clusters 56 GJ#b 56 orbiting Hubble telescope 56 comets orbiting 55 NEAs 55 Upsilon Andromedae b 55 cosmic microwave radiation 55 cosmic cannibal 55 Earthlike planets 55 filamentary structure 55 starquakes 55 exo planets 55 Gravitational lensing 55 TrES 4 55 QQ# 55 Hot Jupiters 55 planet WASP #b 55 Tunguska Siberia 55 asteroidal 55 moons Phobos 55 Martian dust 55 Ithaca Chasma 55 cometary debris 55 protoplanet 55 YORP effect 55 ejecta blanket 55 Gamma ray burst 55 moon Mimas 55 P/# A2 55 orbiting Hubble Space Telescope 55 asteroid collisions 55 Virgo Cluster 54 Apophis asteroid 54 Galileo spacecraft 54 Viking Lander 54 Supernova #A 54 circumstellar disks 54 planets comets 54 Jovian moon 54 meteor impacts 54 Corot 7b 54 RS Ophiuchi 54 Saturn rings 54 Herschel Crater 54 Carina constellation 54 Martian craters 54 lensing galaxy 54 comets 54 planets moons 54 sunlike stars 54 VY Canis Majoris 54 fainter objects 54 Trifid Nebula 54 jovian 54 Ordovician extinction 54 Helix Nebula 53 satellites orbiting Earth 53 NASA LCROSS 53 Einstein relativity theory 53 icy comets 53 Epsilon Eridani 53 impactors 53 Comet Tempel 1 53 circumstellar disk 53 moon Io 53 MG J# +# 53 Cosmic Microwave Background 53 planet magnetosphere 53 lunar craters 53 galaxy M# [001] 53 # Apophis 53 rotational axis 53 lunar perigee 53 protoplanets 53 Pluto Charon 53 exoplanetary 53 GJ #b [002] 53 gravitational waves 53 Cygnus Lyra region 53 KBOs 53 astrophysical objects 53 lunar crater 53 infalling gas 53 WASP #b 53 Fermi telescope 53 Earth magnetosphere 53 cryovolcanism 53 extrasolar 53 Bug Nebula 53 galaxy redshift 53 Cassini flybys 53 comet Tempel Tuttle 53 comet Lulin 53 Comet Hartley 2 53 Saturnian system 53 Tunguska asteroid 53 micro meteorites 53 BP Piscium 53 Martian gullies 52 interstellar cloud 52 Saturn moon Iapetus 52 Gerard Kuiper 52 elongated orbits 52 planets orbits 52 Shoemaker Levy 52 Sagittarius B2 52 moonquakes 52 Oort cloud 52 Evolution Explorer 52 galactic disk 52 supernova explosion 52 X ray observatory 52 Earthlike planet 52 volcanic moon Io 52 super perigee moon 52 interstellar dust particles 52 Alycia Weinberger 52 Yellowstone supervolcano 52 Asteroid Belt 52 Crab Nebula 52 meteoroids 52 crystalline silicates 52 exo planet 52 Gaensler 52 dustier stormier atmosphere 52 cosmological distances 52 gravity warps 52 meteorite impacts 52 Kepler 9c 52 interstellar dust grains 52 HiRISE image 52 Exoplanet 52 meteoroid impacts 52 distant galaxy 52 celestial sphere 52 solar flares 52 planetary embryos 52 HL Tau 52 KH #D 52 moon Phobos 52 faraway galaxies 52 Borealis basin 52 icy moons 52 smallest exoplanet 52 ejecta 52 Orion nebula 52 gravitational radiation 52 Maria Zuber 52 Grillmair 52 innermost planet 52 Wolszczan 52 moonlets 52 unmanned probes 52 gamma ray burst 52 Epsilon Aurigae 52 magnetar 52 galaxies collide 52 galactic collisions 52 isostatic rebound 52 distant quasar 52 nucleosynthesis 52 Bullet Cluster 52 coronal loops 52 GJ #b [001] 52 Chicxulub crater 52 Mars moon Phobos 52 matter antimatter asymmetry 52 distant supernovas 52 brightest supernova 52 supernova explosions 52 Higgs bosons 52 Henize #-# 52 permanently shadowed craters 52 Enceladus 52 novas 52 Planck satellite 52 magnetic substorms 52 ocean basins 52 undersea volcanoes 51 neutralinos 51 Gliese #c 51 protoplanetary 51 superstrings 51 galactic cores 51 subsurface ocean 51 Toutatis 51 Neutron stars 51 Andromeda galaxy 51 Eagle Nebula 51 magnetic monopoles 51 cometary impacts 51 solar corona 51 supersymmetric particles 51 meteoritic material 51 planet Uranus 51 V# Mon 51 radial velocity technique 51 #P/Churyumov-Gerasimenko 51 icy moon Enceladus 51 binary asteroid 51 Comet Halley 51 gravitational interaction 51 Galilean moons 51 gravitational tides 51 Antennae Galaxies 51 sunlike star 51 SN #gy 51 comet orbit 51 planetary orbits 51 extrasolar planets orbiting 51 dimming starlight 51 Saturnian moons 51 Martian rocks 51 Deep Impact comet 51 colliding galaxies 51 Astrophysicists 51 craters 51 cosmic ray flux 51 Comet Hartley 51 SN #A 51 X ray telescopes 51 strangelets 51 starburst galaxies 51 NASA THEMIS 51 Ring Nebula 51 lunar crust 51 BP Psc 51 planets 51 superstorms 51 asteroids comets 51 supervolcanoes 51 Stephan Quintet 51 planetoid 51 Red Rectangle 51 detect gravitational waves 51 Hubble observations 51 interstellar dust clouds 51 Earth objects NEOs 51 subatomic scale 51 visible wavelengths 51 Saturn moons 51 submillimetre wavelengths 51 deep convective clouds 51 Solar TErrestrial RElations Observatory 51 cluster NGC 51 spherules 51 gaseous planet 51 phyllosilicates 51 Jenniskens 51 Crab Pulsar 51 Sojourner rover 51 Martian volcanoes 51 cosmic 51 HiRISE camera 51 planetary Transits 51 Zeta Ophiuchi 51 galactic cosmic rays 51 astrobiological 51 X ray afterglow 51 supermassive 51 Earth radii 51 Tempel 1 50 CoRoT 9b 50 spiral galaxy NGC 50 proplyds 50 NASA Far Ultraviolet 50 moon Deimos 50 tholins 50 Earth asteroids NEAs 50 AU Mic 50 supernovae explosions 50 tidally 50 constellation Coma Berenices 50 Saturn Cassini 50 spaceweather.com 50 KT extinction 50 cometary dust 50 EPOXI spacecraft 50 comet McNaught 50 superdense 50 spacecraft flyby 50 spacetime 50 planet orbits 50 proto galaxies 50 asteroseismology 50 auroral activity 50 Tharsis Rise 50 photosphere 50 Spitzer infrared spectrograph 50 Comet 9P/Tempel 1 50 Cydonia region 50 Avishay Gal Yam 50 planetesimals 50 planetary surfaces 50 infalling 50 Orbiter LRO 50 ESA Integral 50 volcanic lava flows 50 Kuiper Belt object 50 Grammier 50 planetary geologists 50 celestial object 50 Comet Shoemaker Levy 50 sulphate aerosols 50 tectonic plate movements 50 hypervelocity 50 gravitational lens 50 Martians invading 50 solar prominences 50 galaxy formation 50 planemos 50 galactic alignment 50 Gusev crater 50 Erik Asphaug 50 Comet Tempel Tuttle 50 asteroid Vesta 50 silicate dust 50 type Ia supernova 50 Gondolo 50 observable universe 50 Cometary 50 Vourlidas 50 colliding asteroids 50 intrinsic brightness 50 Kuiper belt 50 interstellar clouds 50 Samuel Oschin Telescope 50 galaxy M# [002] 50 elliptical orbits 50 outer planets 50 magnetars 50 Valles Marineris 50 oblate spheroid 50 substorm 50 HiRISE camera aboard 50 solar nebula 50 Chicxulub 50 heavily cratered 50 protoplanetary discs 50 dust enshrouded 50 Plate tectonics 50 SDSS II 50 Martian terrain 50 GALEX 50 Syrtis Major 50 protoplanetary disk 50 Landsat satellite 50 SNR #-#.# 50 arcminutes 50 Nasa spacecraft 50 thin crescent 50 cosmic strings 50 NASA Cassini 50 planetary nebulae 50 type 1a supernovae 50 rocky planets 50 Olympus Mons 50 planets asteroids 50 Lagoon Nebula 50 ultraviolet wavelengths 50 interplanetary spacecraft 50 Neil Gehrels 50 cometary material 50 neutrino particles 50 Eta Aquarid meteor shower 50 Earth rotational axis 50 comet Wild 50 WMAP satellite 50 moonlet 49 planets orbiting sun 49 distant galaxies 49 Earthlike 49 gravitational microlensing 49 Galaxy Evolution 49 Aqua satellite 49 type Ia supernovae 49 merging galaxies 49 Venusian 49 MIT planetary scientist 49 micrometeoroids 49 planets atmospheres 49 lunar meteorites 49 cosmic phenomena 49 Laguna Salada fault 49 galactic cannibalism 49 outer corona 49 Goldilocks planet 49 nebular 49 Meteor showers 49 CoRoT 7b 49 planets orbiting distant 49 starburst galaxy 49 red supergiants 49 Murchison meteorite 49 Omega Nebula 49 dinosaur extinction 49 exoplanetary systems 49 Swift Tuttle 49 Saturn moon 49 Comet #P 49 reionization 49 HD#b 49 retrograde orbits 49 lobate scarps 49 Bruce Jakosky 49 Hellas Basin 49 moon permanently shadowed 49 Antarctic ozone 49 SN #C 49 ESO VLT 49 GQ Lupi 49 Horsehead Nebula 49 atmospheric aerosols 49 Hubble Telescope 49 KT boundary 49 Cosmologists 49 NASA Cassini spacecraft 49 planetesimal 49 planet HD #b 49 Diviner instrument 49 galactic halo 49 G#.# +#.# 49 Explorer WISE 49 Extrasolar planets 49 HIRES spectrometer 49 lunar equator 49 comet nuclei 49 Envisat satellite 49 ejecta plume 49 periodic dimming 49 Yarkovsky effect 49 galactic mergers 49 foreground galaxy 49 Type 1a supernova 49 YU# 49 whiz harmlessly 49 sized planets orbiting 49 SMM J# 49 orbited Jupiter 49 accretion disk 49 planetary science 49 Gliese #d 49 Mars Orbiter 49 Sagittarius dwarf galaxy 49 Mercury magnetosphere 49 neighboring Andromeda galaxy 49 antimatter particles 49 Svedhem 49 Heliospheric Observatory SOHO 49 infall 49 Mars Orbiter Camera 49 Jovian atmosphere 49 magnetic dynamo 49 CMB radiation 49 constellation Vulpecula 49 Kepler Space Telescope 49 microlensing events 49 aboard ESA Envisat 49 orbiting observatories 49 Beta Pictoris 49 martian rocks 49 coronal loop 49 planetary 49 Solar flares 49 Neukum 49 planet gravitational tug 49 Tunguska meteorite 49 galaxy NGC 49 GRB #B 49 martian landscape 49 COROT 7b 49 Orionid 49 Martian crater 49 Cosmic Background Explorer 49 arcsecond 49 Martian rovers 49 constellation Cygnus 49 inner asteroid belt 49 submillimeter 49 helium nuclei 49 NASAs 49 coronal mass ejections CMEs 49 tropical latitudes 49 sulfate aerosols 49 Saturn moon Enceladus 49 WISE telescope 49 Emily Lakdawalla 49 Venusian atmosphere 49 habitable planets 49 Mandushev 49 atmospheric CO2 levels 49 particle colliders 49 dust mote 49 moon Europa 49 occultations 49 Kepler #b 49 X ray pulses 49 impactor spacecraft 49 crustal thickness 49 Arches Cluster 49 axions 49 Cancri e 49 colliders 49 Jupiter flyby 49 astrometry 49 exoplanets planets 49 Herschel telescope 49 blackholes 49 Omega Centauri 49 impactor 49 HD #b [001] 49 gravitational interactions 49 star Gliese 49 Keck Interferometer 49 planetary nebulas 49 airglow 49 NASA Opportunity rover 49 noctilucent clouds 49 martian atmosphere 49 Caloris Basin 48 Asteroid Apophis 48 Jonathan Lunine 48 Coma Cluster 48 meter diametre 48 martian meteorites 48 Candor Chasma 48 Virgo cluster 48 moons orbiting 48 red supergiant 48 AB Aurigae 48 Kepler spacecraft 48 Saturn Enceladus 48 zodiac constellations 48 gravitational anomalies 48 Asteroid Itokawa 48 habitable worlds 48 circumstellar dust 48 globulars 48 X ray wavelengths 48 HM Cancri 48 flood basalts 48 Cabeus crater 48 magnetic monopole 48 optical interferometry 48 constellation Hercules 48 Arsia Mons 48 heliosphere 48 spectroscopic measurements 48 zodiacal dust 48 Galactic cosmic rays 48 Halley comet 48 Gliese #G 48 hypervelocity star 48 globular cluster M# 48 moons circling 48 Kuiper belt object 48 dwarf galaxy 48 evaporite deposits 48 Oort Cloud 48 X ray emission 48 Greenland icecap 48 Milky Way halo 48 moon Mab 48 extrasolar planet 48 aerosol particles 48 Shackleton crater 48 dense clumps 48 cosmological theories 48 Baptistina 48 Red Planet 48 infrared observatory 48 Nasa Kepler 48 wrinkle ridges 48 Comet Elenin 48 Peony nebula star 48 extrasolar worlds 48 Comet Hale Bopp 48 astrophysical 48 star Proxima Centauri 48 constellation Cassiopeia 48 comet tail 48 proton antiproton 48 cometary 48 SN #D 48 Helix nebula 48 Tunguska explosion 48 NASA Stardust spacecraft 48 Cassini flyby 48 dwarf spheroidal galaxies 48 proto planetary disk 48 cosmic magnifying glass 48 lowermost mantle 48 globular star 48 martian 48 APXS 48 eclipsing binary 48 thermonuclear reactions 48 exhaust plume 48 comet dust 48 NASA EPOXI mission 48 terrestrial planets 48 gravitational lenses 48 Type 1a supernovae 48 NASA Kepler telescope 48 Hubble Captures 48 tiniest particles 48 ULIRGs 48 Manned missions 48 Itokawa 48 V# Sgr 48 atomic particles 48 Trojan asteroids 48 blue straggler 48 TRMM satellite 48 Chasma Boreale 48 Perseus Cluster 48 spherical halo 48 Delta Cephei 48 Noachian era 48 Magnetars 48 Hubble telescope 48 Sumatra Andaman earthquake 48 RS Oph 48 spacecrafts 48 Microlensing 48 magnetosphere 48 protostars 48 reflection nebula 48 Cryospheric Sciences Branch 48 planetary transits 48 phyllosilicate 48 polar vortex 48 gravitational tugs 48 antineutrinos 48 GLAST telescope 48 Deep Impact 48 Wilkinson Microwave Probe 48 planetary scientist 48 HD #b [002] 48 Milky Way Galaxy 48 luminous galaxies 48 cosmological parameters 48 planets orbiting 48 Earth biosphere 48 earthlike planets 48 Comet #P/Holmes 48 Asteroids 48 galaxies 48 protoplanetary disks 48 Hanny Voorwerp 48 Supermassive black 48 Submillimeter Array 48 Kuiper Belt Objects 48 Comet Encke 48 glacier melts 48 Charon Pluto 48 NASA ICESat 48 celestial phenomena 48 EPOXI mission 48 ESA Mars 48 Compact Reconnaissance Imaging Spectrometer 48 polar mesospheric clouds 48 Ozone Hole 48 HiRISE images 48 extrasolar planetary systems 48 NASA STEREO 48 magma ocean 48 constellation Carina 48 axial tilt 48 heliopause 48 Cassini Huygens spacecraft 48 Valles Marineris canyon 48 SpaceWeather.com 48 neutrino detectors 48 Yellowstone Caldera 48 constellation Ursa Major 48 active galactic nucleus 48 Venus transits 48 olivine mineral 48 WISE spacecraft 48 galaxy cluster 48 RX J# 48 nebula NGC 48 Konacki 48 WD5 48 Hubble orbits 48 Eta Carinae 48 comets meteors 48 gamma ray bursts GRBs 48 airbursts 48 constellation Eridanus 48 earthshine 47 Super Kamiokande 47 Quentin Tarantino Waltz 47 Type Ia supernova 47 X ray observatories 47 ringed planet 47 fissure eruption 47 Extrasolar Planet 47 comet particles 47 stellar seismology 47 telescopes astronomers 47 Planck telescope 47 Chi Cygni 47 Lunar Prospector 47 Ares Vallis 47 twin Voyager spacecraft 47 spiral nebulae 47 Comet Lulin 47 albedo reflectivity 47 Methone 47 Viking Orbiter 47 gibbous 47 coronal mass ejection 47 retrograde orbit 47 meteorite craters 47 OGLE TR #b 47 asteroid flyby 47 reionization epoch 47 NASA rovers Spirit 47 binary asteroids 47 Phobos 47 cosmic rays 47 shadowy craters 47 cinder cones 47 Martian equator 47 Deep Impact probe 47 Martian dust devils 47 astrophysicists 47 dust devils 47 aurorae 47 extrasolar planets 47 fearsome Tyrannosaurus rex 47 lunar soil 47 Foing 47 NASA Spirit rover 47 basaltic rocks 47 moons orbiting Saturn 47 comet Churyumov Gerasimenko 47 Torino Scale 47 Schwarzschild radius 47 NASA Voyager spacecraft 47 constellation Aquarius 47 colliding tectonic plates 47 interstellar magnetic 47 iridium layer 47 Jon Giorgini 47 Cherenkov radiation 47 Martian dunes 47 moon Dione 47 Earth magnetotail 47 Aram Chaos 47 Beta Pictoris b 47 X ray binaries 47 sedimentary deposits 47 supernova remnants 47 elliptical galaxy 47 carbon cenospheres 47 ionized hydrogen 47 planets Uranus 47 Quadrantids 47 interferogram 47 Palaeocene Eocene Thermal Maximum 47 ionized particles 47 hypervelocity stars 47 runaway thermonuclear 47 proton proton collisions 47 fault scarps 47 NASA Wilkinson Microwave 47 Gliese #e 47 earthquakes volcanoes 47 zodiacal light 47 Joel Primack 47 blue supergiant 47 Mars Squyres 47 spiral galaxy Messier 47 gravitational perturbations 47 Saturn outermost ring 47 radial velocity method 47 Spitzer Space Telescope 47 Saturn outermost 47 celestial bodies 47 proto cluster 47 Meridiani 47 helium atoms 47 Saturnian moon Titan 47 sterile neutrino 47 dynamical evolution 47 exoplanets 47 redshifted 47 Hawking Radiation 47 Tevatron collider 47 Fermi Telescope 47 geomagnetic activity 47 mesosphere 47 GA6 47 constellation Centaurus 47 Comet Holmes 47 solar minima 47 Chilean Atacama Desert 47 electron neutrinos 47 J# +# [002] 47 gamma ray observatory 47 lightwaves 47 SuperMoon 47 interacting galaxies 47 SOHO spacecraft 47 Muons 47 interstellar boundary 47 submillimeter wavelengths 47 Opportunity Mars rover 47 Churyumov Gerasimenko 47 Convection Rotation 47 Lake Cheko 47 Saturnian 47 Martian meteorite 47 Oceanus Procellarum 47 Great Conveyor Belt 47 planetary alignments 47 coronal heating 47 planets circling stars 47 Martian surface 47 relativistic speeds 47 planetary atmospheres 47 exosphere 47 asteroid Apophis 47 SIRTF 47 Anisotropy Probe 47 Fornax cluster 47 baryonic matter 47 earthlike 47 arcsec 47 particle smasher 47 Astronomically speaking 47 meteor 47 volcanoes spewing 47 Hubble Space telescope 47 Tycho supernova remnant 47 Corot 9b 47 RQ# 47 protostar 47 extragalactic 47 astrobiologists 47 supercomputer simulations 47 gamma ray astronomy 47 supermoon 47 crater 47 interstellar dust 47 STEREO spacecraft 47 Mimas 47 Mars Phobos 47 tidal bulge 47 Isidis Planitia 47 interstellar 47 perfectly spherical 47 supermassive stars 47 Quaoar 47 topological defects 47 planetary nebula 47 particle astrophysics 47 rover panoramic 47 Geminga 47 Magellanic Stream 47 SN#A 47 shadowed craters 47 constellations Cygnus 47 ESA XMM Newton 47 strangelet 47 Opportunity rover 47 RHESSI 47 infrared satellite imagery 47 APEX telescope 47 carbonaceous chondrite 47 arcseconds 47 Einstein theory 47 MARSIS radar 47 Mars rovers Spirit 47 oceanic circulation 47 Geminids meteor shower 47 Tropical Rainfall Measuring 47 ray Space Telescope 47 COROT 47 Extrasolar 47 comet Tempel 1 47 clumpiness 47 neutrino mass 47 HD# [002] 47 asteroid Steins 47 supercell storms 47 Deep Impact flyby spacecraft 47 LCROSS 47 carbonate minerals 47 millisecond pulsar 47 Invisibility cloak 47 pyroclastic flow 47 supernovas 47 Fashion Movie Reviews 47 GRBs 47 Mars Pathfinder 47 chondrules 47 moon Charon 47 Kuiper Belt objects 47 Michael Studinger 47 lunar magma 47 comet Hale Bopp 47 hadron 47 Orbiting Carbon Observatory OCO 47 particle acceleration 47 Andromeda Galaxy 47 SIM PlanetQuest 47 Chicxulub Crater 47 Bernhard Fleck 47 SNe Ia 47 Bonneville Crater 47 astronomer Edmond Halley 47 Bedout 47 Apophis 47 Shri Kulkarni 46 Spaceguard Survey 46 energetic electrons 46 brightnesses 46 polar icecap 46 atmospheric circulations 46 electron orbits 46 mantle plumes 46 Wilkinson Microwave Anisotropy Probe 46 Reiner Gamma 46 Bok globules 46 diffuse aurora 46 explosive eruptions 46 infrared telescope 46 called lobate scarps 46 Kraken Mare 46 igneous rocks 46 Trifid 46 cosmic ray collisions 46 Io Europa 46 spacecraft thrusters 46 cosmic microwave background 46 periodic oscillations 46 lenticular clouds 46 GigaGalaxy Zoom 46 Martian permafrost 46 Eta Aquarids 46 stellar occultations 46 Mpc 46 megafauna extinction 46 meridional flow 46 transiting exoplanets 46 Leonid meteor 46 WISE infrared 46 climate modellers 46 Comet #P/Churyumov-Gerasimenko 46 Nikku Madhusudhan 46 Cat Paw Nebula 46 volcanic plumes 46 spacecraft Cassini 46 landing Navias 46 distant quasars 46 NASA Kepler 46 collisional 46 Earth ozone layer 46 Antarctic Dry Valleys 46 Ontario Lacus 46 Mini TES 46 Superstorm 46 hematite mineral 46 Terra Sirenum 46 supernova remnant 46 galactic magnetic 46 inner moons 46 antiparticle 46 Astrophysical 46 compressional 46 metallicity 46 LCROSS mission