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(Click for frequent words.) 67 interstellar dust grains 63 comet particles 62 icy comets 62 asteroids orbiting 62 interstellar particles 62 KBOs 61 Fomalhaut b 61 Martian rocks 61 impactor spacecraft 61 comet Tempel Tuttle 61 IRAS #-# 61 comet dust 60 Kuiper belt objects 60 cometary material 60 exo planets 60 comet nucleus 60 sunlike star 60 interstellar dust 60 smallest exoplanet 60 Cygnus Lyra region 60 GJ #b [002] 59 planet HD #b 59 sunlike stars 59 interstellar grains 59 Saturn Cassini 59 Fermi telescope 59 Kuiper Belt Objects 59 interstellar dust samples 59 moons Phobos 59 NEAs 59 MG J# +# 59 star Gliese 59 COROT 7b 59 planets orbiting distant 59 Oort Cloud 58 Red Rectangle 58 EPOXI spacecraft 58 comets orbiting 58 distant quasar 58 exo planet 58 galaxy M# [001] 58 Phoebe orbits 58 comet McNaught 58 moons orbiting Saturn 58 Sojourner rover 58 moon Deimos 58 Comet Hartley 2 58 Nasa spacecraft 58 moon Enceladus 58 http:/saturn.jpl.nasa.gov 58 lunar meteorites 58 planets orbiting stars 58 lunar soil 58 cometary dust 58 NASA EPOXI mission 57 asteroid Vesta 57 protoplanetary 57 Samuel Oschin Telescope 57 interstellar cloud 57 CoRoT #b 57 planets orbiting sun 57 RQ# 57 moonlets 57 Epsilon Eridani 57 Deep Impact flyby spacecraft 57 exosphere 57 microscopic specks 57 Coma Cluster 57 submillimetre wavelengths 57 NASA Stardust spacecraft 57 Earthlike planets 57 GJ#b 57 distant supernovae 57 Kuiper Belt Object 57 Oort cloud 57 HiRISE image 57 circumstellar disks 57 Corot 7b 57 Evolution Explorer 57 constellation Vulpecula 57 Proxima Centauri 57 volcanic moon Io 57 Astrological lore 56 exoplanets planets outside 56 exoplanets planets 56 Wilkinson Microwave Probe 56 ultraluminous galaxy 56 Martian craters 56 Cancri e 56 planets circling stars 56 gamma ray observatory 56 Ring Nebula 56 Comet Hartley 56 Ulysses spacecraft 56 dimming starlight 56 Jupiter magnetosphere 56 Zeta Ophiuchi 56 Hot Jupiters 56 planetary Transits 56 comet flyby 56 comet Wild 56 HD#b 56 lunar crust 56 whiz harmlessly 56 mu Arae 56 TNOs 56 visit http:/saturn.jpl.nasa.gov 56 comet 56 trans Neptunian objects 56 interacting galaxies 56 exoplanet orbiting 56 Convection Rotation 56 Comet Tempel Tuttle 56 Kuiper Belt objects 56 spiral galaxy Messier 56 Coma cluster 56 VY Canis Majoris 56 extrasolar planet 56 Earthlike planet 56 Kepler #b 56 Kepler 9c 56 Martian rovers 56 orbits Saturn 56 hydroxyl molecules 56 WISE telescope 56 globulars 56 Comet Lulin 55 gaseous planet 55 cosmological distances 55 airglow 55 micrometre 55 martian rocks 55 P/# A2 55 nanometers billionths 55 antihydrogen atoms 55 Saturn outermost ring 55 Stardust spacecraft 55 moon Ganymede 55 spacecraft flyby 55 planets comets 55 Jupiter Ganymede 55 astronomical objects 55 closest flyby 55 Martian meteorites 55 extrasolar planets orbiting 55 moons orbiting 55 tholins 55 extrasolar 55 comet Lulin 55 Boethin 55 periodic dimming 55 planet Gliese #g 55 AU Mic 55 Virgo Cluster 55 Syrtis Major 55 Geminga 55 G#.# +#.# 55 protons collide 55 Neptune Uranus 55 permanently shadowed craters 55 planetary embryos 55 HD #b [002] 55 moon Phobos 55 fainter objects 55 reentry capsule 55 BP Piscium 55 Elenin 55 Martian dust 55 Corot 9b 55 Galileo spacecraft 55 APXS 55 moon Mab 55 micrometres 55 X ray binaries 55 Galilean moons 55 carbonaceous chondrite 55 #P/Churyumov-Gerasimenko 55 millisecond pulsar 55 moons circling 55 TrES 4 55 moon Io 55 Nasa Kepler 55 spacecraft Cassini 55 Galactic cosmic rays 55 transiting planets 54 Saturn rings 54 THEMIS satellites 54 spaceweather.com 54 Comet Hale Bopp 54 luminous galaxies 54 supernovae explode 54 Upsilon Andromedae b 54 Solar TErrestrial RElations Observatory 54 planet Gliese #c 54 asteroid Itokawa 54 WASP #b 54 zodiacal dust 54 BLG #Lb 54 hunting Kepler telescope 54 filler poking 54 Saturn outermost 54 Saturn Enceladus 54 emit X rays 54 sized planets orbiting 54 gravitationally lensed 54 Comet Encke 54 Mars moon Phobos 54 http:/www.nasa.gov/cassini 54 Aurigid 54 micrometers thick 54 Scientists theorized 54 planets asteroids 54 radial velocity technique 54 Neutron stars 54 Planck satellite 54 X ray pulses 54 circumstellar 54 Io volcanoes 54 Pluto Charon 54 Magnetars 54 protoplanet 54 WISE spacecraft 54 millisecond pulsars 54 antineutrinos 54 Nasa Mars Reconnaissance 54 Dwarf galaxies 54 icy moons 54 Spitzer infrared 54 constellation Hercules 54 Quadrantids 54 AB Aurigae 54 planet orbits 54 PSR J# 54 Antennae Galaxies 54 interstellar dust clouds 54 planets orbiting 54 Saturnian moon 54 Gliese #c 54 GJ #b [001] 54 Chilean Atacama Desert 54 constellation Cetus 54 transiting planet 54 hexagonal mirrors 54 Lander robotic arm 54 particle detectors 54 Bug Nebula 54 distant galaxy 54 Kuiper Belt object 54 smoothest flattest spot 54 galactic disk 54 constellation Virgo 54 Baptistina 54 circumstellar disk 54 Herschel telescope 54 silicate dust 54 microlensing events 54 inner Oort Cloud 54 polarimetry 54 filamentary structure 54 cosmic cannibal 54 cometary particles 54 Beta Pictoris 54 Diviner instrument 54 Trojan asteroids 54 Earthlike 54 comets asteroids 54 polystyrene spheres 54 CoRoT 7b 54 inhabitable planets 54 COROT exo 3b 54 Epsilon Aurigae 54 Hubble orbits 54 CoRoT 9b 54 earthlike planets 54 Beta Pictoris b 54 hypervelocity stars 53 RRATs 53 exoplanetary systems 53 planet HD#b 53 cosmic ray collisions 53 distant galaxy clusters 53 eccentric orbits 53 GALEX 53 Perseus Cluster 53 ESO VLT 53 Saturnian moon Titan 53 stellar occultations 53 Heliospheric Observatory SOHO 53 HiRISE images 53 meteoroids 53 intrinsic brightness 53 IRC +# 53 exoplanetary 53 phyllosilicates 53 constellation Carina 53 constellation Eridanus 53 O OREOS 53 IBEX spacecraft 53 Higgs bosons 53 Cometary 53 crystalline silicates 53 graphite whiskers 53 ENAs 53 smallest extrasolar planet 53 Muchachos Observatory 53 Adam Riess 53 X ray wavelengths 53 extrasolar planetary systems 53 Deep Impact craft 53 constellation Pegasus 53 lunar equator 53 Virgo cluster 53 CMB radiation 53 northern arctic plains 53 exoplanets orbiting 53 Descent Imager Spectral Radiometer 53 planets astronomers 53 olivine crystals 53 Herschel Space Telescope 53 Itokawa asteroid 53 ultraviolet wavelengths 53 retroreflector 53 faraway galaxies 53 Comet Halley 53 electron volts eV 53 neutron spectrometer 53 rocky planets 53 Ian McShane Pillars 53 merging galaxies 53 Super Earths 53 constellation Aquarius 53 orbited Jupiter 53 OGLE TR #b 53 galaxy redshift 53 LRO spacecraft 53 HIRES spectrometer 53 aerosol particles 53 Cassini flyby 53 submillimeter wavelength 53 retrograde orbits 53 carbonaceous chondrites 53 planemos 53 microplastics 53 Planetary Transits 53 constellation Andromeda 53 Fermi Telescope 53 galactic halo 53 submillimeter wavelengths 53 detect gamma rays 53 proton antiproton collisions 53 Gravitational waves 53 Henize #-# 53 Cassini Huygens spacecraft 53 Orbiter LRO 53 Stadermann 53 Gamma ray burst 53 Apophis asteroid 53 HD #b [001] 53 Gliese #d 53 spiral galaxy NGC 53 HIP #b 53 Mars Pathfinder lander 53 BBs lodged 53 asteroids comets 53 helium atoms 53 meteoroid 53 olivine mineral 53 Venusian atmosphere 53 polar craters 53 X ray afterglow 53 micrometre sized 53 ionized gases 53 extrasolar worlds 53 infrared telescopes 53 Valles Marineris 53 HARPS instrument 53 astrophysical objects 53 planetary nebulae 52 Milky Way Galaxy 52 EPOXI mission 52 occultations 52 binary asteroid 52 Globular clusters 52 galaxy M# [002] 52 habitable worlds 52 hematite mineral 52 NASA Cassini 52 bedrock outcropping 52 Comet Holmes 52 Extrasolar planets 52 albedo reflectivity 52 shepherding spacecraft 52 microns millionths 52 meter diametre 52 supergiant stars 52 transiting exoplanet 52 irregularly shaped asteroid 52 nebular 52 CERN experiments 52 Saturn moon Mimas 52 planet magnetosphere 52 IntergalaticEarth 52 retrograde orbit 52 cosmic collisions 52 outer corona 52 cometary 52 Kuiper belt object 52 planets orbits 52 Orionids 52 Swift Tuttle 52 silicate rocks 52 Gamma ray bursts 52 energetic electrons 52 subsurface ocean 52 arcminutes 52 Mercury magnetosphere 52 Pluto Eris 52 elongated orbits 52 outermost planet 52 baryonic matter 52 hundred thousandth 52 thrilling stargazers 52 hydrated minerals 52 extrasolar planets 52 KH #D 52 outermost planets 52 lunar craters 52 magnetars 52 orbiting Kepler telescope 52 ESA XMM Newton 52 interplanetary spacecraft 52 Martians invading 52 Rosette Nebula 52 HL Tau 52 asteroidal 52 lander rover 52 Quaoar 52 Mössbauer 52 Jenniskens 52 micrometres thick 52 X ray photons 52 Quadrantid meteor shower 52 meteorite fragments 52 distant quasars 52 galaxy NGC 52 constellation Ursa Major 52 Cosmic Evolution 52 glows brightly 52 spacecraft orbiting 52 sub glacial lakes 52 planetesimals 52 Omega Centauri 52 missing baryons 52 observable universe 52 multi celled 52 icy moon Enceladus 52 constellations Cygnus 52 Aqua satellite 52 planet orbiting 52 Saturn moon 52 Comet #P/Churyumov-Gerasimenko 52 Cassini Image 52 ionized particles 52 Saturn magnetosphere 52 Saturn equinox 52 Taurus Littrow Valley 52 Cassini spacecraft 52 Epoxi 52 Tunguska Siberia 52 OMEGA instrument 52 Orbiter MRO 52 Tauri Sb 52 flyby spacecraft 52 gravitational microlensing 52 Infrared Thermal Imaging Spectrometer 52 magnetotail 52 SN #gy 52 asteroid Eros 52 Doppler measurements 52 comets 52 electron neutrinos 52 Saturnian moons 52 STEREO spacecraft 52 chondritic meteorites 52 interstellar clouds 52 unaided eye 52 Dumbbell Nebula 52 Reconnaissance Orbiter 52 gamma rays emitted 52 fossilized creatures 52 Uranus Neptune 52 Helix Nebula 52 Cabeus crater 52 planetary surfaces 52 ejecta blanket 52 Jovian moons 52 Orion nebula 52 neutrino particles 52 Starz Pillars 52 Carina constellation 52 polar orbits 52 nanometers thick 52 distant supernovas 52 Asteroid Belt 52 meteoritic material 52 moonlet 52 fascinating factoids 52 Voyager spacecraft 51 Context Camera 51 telescopes astronomers 51 circular orbits 51 ostracods 51 neutralinos 51 S/# P2 51 discover Fomalhaut 51 QQ# 51 Comet Machholz 51 Cassini flybys 51 Landsat satellites 51 dustier stormier atmosphere 51 silicon monoxide 51 Comet Tempel 1 51 GQ Lupi 51 diffuse aurora 51 Heterodyne Instrument 51 SpaceWeather.com 51 planets atmospheres 51 crossbar latches 51 NASA STEREO 51 Orion Nebula 51 unmanned probes 51 Hubble Space telescope 51 innermost planet 51 Eagle Nebula 51 Chajnantor plateau 51 Saturnian 51 COROT 51 type Ia supernovae 51 Voyager spacecraft flew 51 moon Charon 51 spherical halo 51 southern supercontinent 51 TrES 51 Astronomy buffs 51 Noachian era 51 gamma ray photons 51 PSR B# 51 ESO telescopes 51 Rosetta lander 51 Optical Spectroscopic 51 electrons orbiting 51 Galaxy Evolution 51 NGC #A 51 transiting exoplanets 51 supergiant star 51 celestial object 51 constellation Centaurus 51 gravitational keyhole 51 Wolf Rayet star 51 Gliese #e 51 comet Hale Bopp 51 Kepler Mission 51 planetary nebulas 51 Kepler Space Telescope 51 Mini Thermal Emission 51 lensing galaxy 51 ellipsoids 51 Peony nebula star 51 chondrites 51 comet tail 51 exoplanets 51 smallest exoplanets 51 Upsilon Andromedae 51 Follett Pillars 51 Kuiper belt 51 Cosmic rays 51 blue supergiant 51 NASA Wilkinson Microwave 51 Manned missions 51 tidal bulge 51 colliding protons 51 gaseous planets 51 Churyumov Gerasimenko 51 amateur astronomers peering 51 infall 51 Itokawa 51 Mission SRTM 51 Anthony Remijan 51 XO 3b 51 Galilean satellites 51 exosolar planets 51 HD# [002] 51 Candor Chasma 51 microns thick 51 N. Rathnasree 51 pallasite 51 Andromeda galaxy 51 Zolensky 51 ecliptic plane 51 NASA Kepler spacecraft 51 electrons positrons 51 gravitational lenses 51 LCROSS spacecraft 51 X ray binary 51 Murchison meteorite 51 solar corona 51 globular clusters 51 Ranging spacecraft 51 RY Sagittarii 51 martian meteorites 51 SIRTF 51 Heliospheric Observatory 51 NASA Far Ultraviolet 51 Earth magnetosphere 51 YU# 51 carbonate globules 51 ESA ASI 51 Giovanni Cassini 51 infrared spectrometers 51 RX J# 51 planets moons 51 star Beta Pictoris 51 geoneutrinos 51 RXTE 51 infrared telescope 51 star Proxima Centauri 51 Huygens descent 51 Andromeda Galaxy 51 Odyssey orbiter 51 protoplanets 51 comet #P/Churyumov-Gerasimenko 51 penumbral shadow 51 Global Surveyor spacecraft 51 smoggy atmosphere 51 protoplanetary disk 51 GRB #B 51 potassium atoms 51 Titan Saturn 51 waxing crescent 51 THEMIS spacecraft 51 Wolszczan 51 millimeter wavelength 51 Earth radii 51 comets meteors 51 martian soil 51 Lutetia 51 Hanny Voorwerp 51 dwarf galaxies 51 Anisotropy Probe 51 micrometer scale 51 Kepler spacecraft 51 GA6 51 comet nuclei 51 geyser plumes 51 NASA Kepler telescope 51 Wassonite 51 absorbs photons 51 muon neutrino 51 orbiting telescopes 50 Kepler Telescope 50 micrometers 50 solidified lava 50 interplanetary dust 50 spacecraft orbited 50 spectral fingerprint 50 brightest supernova 50 ejecta plume 50 Lake Vostok 50 particle detector 50 comet Churyumov Gerasimenko 50 globular cluster 50 shadowy craters 50 THEMIS 50 aperture telescope 50 foreground galaxy 50 Multi Object Spectrograph 50 constellation Cassiopeia 50 dwarf galaxy 50 proto cluster 50 antimatter particles 50 telescope eyepiece 50 airbursts 50 Crab Pulsar 50 Polycyclic aromatic hydrocarbons 50 Mossbauer spectrometer 50 Mars Orbiter Camera 50 Allende meteorite 50 ejecta 50 Eta Carinae 50 gravitationally bound 50 Infrared Array Camera 50 arcsecond 50 asteroid flyby 50 WMAP satellite 50 meteorites 50 Saturnian system 50 SN #A 50 orbits 50 TGFs 50 SIM PlanetQuest 50 Damaging hail 50 twin STEREO spacecraft 50 Cancri 50 primitive meteorites 50 Halley comet 50 Mpc 50 single celled microorganisms 50 NASA Cassini spacecraft 50 magnetic monopoles 50 Charon Pluto 50 planetary magnetospheres 50 Hubble Space Telescope HST 50 potentially habitable planets 50 Veil Nebula 50 Toutatis 50 Martian crater 50 photons particles 50 diffraction patterns 50 Opportunity Mars rover 50 YORP effect 50 Martian polar 50 galactic bulge 50 interstellar boundary 50 Jupiter moon Io 50 Ground penetrating radar 50 globular cluster M# 50 Hyakutake 50 Triangulum Galaxy 50 Tempel Tuttle 50 moon Mimas 50 aboard ESA Envisat 50 Arches Cluster 50 LCROSS 50 X ray telescopes 50 outermost layers 50 refrozen ice 50 sauropod skulls 50 BRACELET MEASUREMENTS Opening 50 orbiting observatories 50 jovian 50 CAIs 50 Express orbiter 50 Gliese #G 50 giant gaseous planets 50 Cosmic Microwave Background 50 barred spiral galaxy 50 constellation Ara 50 ultraviolet imaging spectrograph 50 pinhead sized 50 umbral shadow 50 scanning electron microscopes 50 dense clumps 50 largest moon Charon 50 Jupiter icy moons 50 telescope Uranus 50 ion propulsion engines 50 Cassini 50 orbiting Cassini spacecraft 50 Steins asteroid 50 worm Caenorhabditis elegans 50 helium nuclei 50 Caloris 50 RS Ophiuchi 50 Trifid Nebula 50 Explorer WISE 50 planets circling 50 distant galaxies 50 cosmic ray particles 50 Jonathan Lunine 50 elliptical galaxy 50 CoRoT satellite 50 chlorophyll molecules 50 Viking Lander 50 HAT P 50 particles 50 multiband imaging photometer 50 Saturn moon Enceladus 50 NASA Lunar Reconnaissance 50 SDSS II 50 #/#-ton truss 50 GRBs 50 habitable planets 50 Shoemaker Levy 50 Exoplanets 50 X ray observatory 50 Gamma rays 50 photosphere 50 solar prominences 50 micrometeoroids 50 robotic explorer 50 Stardust spacecraft swooped 50 microlenses 50 Fashion Movie Reviews 50 rotating neutron stars 50 chondrules 50 Foton spacecraft 50 particle smasher 50 Rydberg atom 50 inch refractor telescope 50 Saturn outermost moon 50 Foton M3 50 red supergiant 50 ray Space Telescope 50 AGNs 50 Triceratops skull 50 Solar Terrestrial Relations 50 spectral characteristics 50 super Earths 50 Orionid meteors 50 quadrillion bytes 50 star Fomalhaut 50 martian surface 50 XTE J# 50 zodiac constellations 50 Climate Experiment GRACE 50 phyllosilicate 50 solar radii 50 interstellar molecules 50 stony meteorites 50 ah dus 50 Lagoon Nebula 50 earthshine 50 Avishay Gal Yam 50 BP Psc 50 distant suns 50 Planck spacecraft 50 lightwaves 50 NASA QuikScat satellite 50 interferometric synthetic aperture radar 50 Jovian moon 50 Mars landers 50 orbital eccentricity 50 Milky Way galaxy 50 spectroscope 50 cometary debris 49 Muons 49 Tiny particles 49 constellation Fornax 49 muon neutrinos 49 Ontario Lacus 49 detect gravitational waves 49 Venus Neptune Uranus 49 planet WASP #b 49 rover Sojourner 49 Wolf Rayet stars 49 lunar meteorite 49 VIRTIS 49 optical telescopes 49 micrometer sized 49 biosignatures 49 spectrographs 49 chlorosomes 49 supersymmetric particles 49 Moderate Resolution Imaging 49 synchrotron x ray 49 imaging spectrometer 49 super perigee moon 49 Meridiani plains 49 martian atmosphere 49 entire Milstar constellation 49 Microlensing 49 Deep Impact eXtended Investigation 49 # Apophis 49 Cassini Huygens 49 solar nebula 49 NuSTAR 49 magnetic monopole 49 Horsehead Nebula 49 rubidium atoms 49 stellar occultation 49 spherules 49 journal Meteoritics 49 infrared wavelengths 49 Pleiades cluster 49 diffracted 49 extragalactic 49 rover Opportunity 49 muons 49 chondritic 49 reflection nebula 49 axions 49 luminosities 49 twin Voyager spacecraft 49 galaxy clusters 49 concretions 49 Viking landers 49 starburst galaxy 49 micro meteorites 49 Rosetta orbiter 49 NASA Opportunity rover 49 noctilucent clouds 49 infrared observatory 49 spatially resolved 49 comet Tempel 1 49 proto planetary disk 49 laser altimeter 49 submillimeter 49 cosmic microwave radiation 49 LADEE 49 Extrasolar Planets 49 Titan smoggy 49 ionized hydrogen 49 comet Hartley 2 49 supernova explosions 49 dust mote 49 Atlantis undocks 49 interferogram 49 waning gibbous 49 pallasite meteorite 49 submillimetre 49 Uninhabited Aerial Vehicle 49 NASA ICESat 49 zettabytes 49 asteroid 49 eclipsing binary 49 micron thick 49 Deep Impact probe 49 P Churyumov Gerasimenko 49 Ice Age mammals 49 constellation Sagittarius 49 Enceladus flyby 49 rover panoramic 49 ESA Integral 49 reddish orange hue 49 spinning neutron stars 49 iridium layer 49 lunar crater 49 WISE infrared 49 arcseconds 49 NASA Kepler 49 lightweight synthetic aperture 49 NASA twin rovers 49 galactic clusters 49 Earth orbiting satellites 49 conodonts 49 J# +# [002] 49 spectroscopically 49 Svedhem 49 WISE mapped 49 Hollywood dreck Battlefield 49 astronomical telescope 49 SINFONI 49 habitable zones 49 sterile neutrino 49 Weakly Interacting Massive Particles 49 satellites orbiting Earth 49 planet TrES 49 New Horizons spacecraft 49 HARPS spectrograph attached 49 galactic cosmic rays 49 basaltic rocks 49 binary asteroids 49 copper impactor 49 highly elliptical orbits 49 spheroidal 49 protoplanetary disks 49 Gliese #g 49 Mars rovers Spirit 49 geo synchronous 49 Uranus Jupiter 49 Garan rode 49 Imaging Spectroradiometer MODIS instrument 49 microns 49 LORRI 49 Voorwerp 49 redshifted 49 rotational axis 49 constellation Coma Berenices 49 constellation Monoceros 49 cluster NGC 49 TRMM satellite 49 potentially habitable 49 supernovae explosions 49 Amateur astronomers 49 #x magnification [002] 49 gibbous 49 wispy cirrus clouds 49 lander robotic arm 49 meteor impacts 49 spectroscopic analysis 49 ions electrically charged 49 bandgaps 49 coronal loops 49 Donilon likened 49 Supernova #A 49 zircon crystal 49 red supergiants 49 ALH# 49 star clusters nebulae 49 SN #C 49 primordial ingredients 49 Venus transits 49 moon Dione 49 neutrino mass 49 asteroid belt 49 THEMIS Images 49 elliptical orbits 49 cinder cones 49 ionizes