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(Click for frequent words.) 66 comet Tempel Tuttle 66 infalling 65 cometary debris 64 Swift Tuttle 64 comet 63 comet McNaught 63 interstellar dust 62 Halley comet 62 circumstellar disk 62 ejecta 62 P/# A2 61 Jupiter magnetosphere 61 meteoroid 61 Comet Halley 61 galactic disk 61 Comet Tempel Tuttle 61 circumstellar 61 cometary 60 comet nucleus 60 protoplanets 60 meteoroids 60 helium atoms 60 protoplanetary disk 59 Comet Hartley 59 accretion disk 59 solar prominences 59 sundog 59 galactic halo 59 moon Io 59 Earth magnetotail 59 Halley Comet 59 V# Mon 59 moon Enceladus 59 interstellar cloud 58 Saturn rings 58 Saturn moon Enceladus 58 X ray afterglow 58 KH #D 58 Comet Hartley 2 58 nebular 58 gamma rays emitted 58 moonlet 58 elongated orbits 58 stellar occultation 58 Epsilon Aurigae 58 accretion disks 58 magnetotail 58 NASA Voyager spacecraft 58 ionized particles 58 infall 57 Earth magnetosphere 57 jovian 57 exosphere 57 energetic electrons 57 transiting planet 57 Voyager spacecraft 57 Planetary nebulae 57 quantum particle 57 periodic dimming 57 Bullet Cluster 57 prominences 57 interstellar medium 57 comet particles 57 solar corona 57 Tempel Tuttle 57 substorm 57 ionized gas 57 Saturn magnetosphere 57 SN #A 56 protoplanet 56 X ray emission 56 airglow 56 millisecond pulsar 56 IBEX spacecraft 56 RS Ophiuchi 56 AB Aurigae 56 ejecta blanket 56 comet Hale Bopp 56 X ray pulses 56 ionised gas 56 transiting exoplanet 56 tidal tails 56 Comet 9P/Tempel 1 56 polar vortex 56 interstellar dust clouds 56 icy comets 56 NASA Cassini spacecraft 56 blue straggler 56 Comet Lulin 56 oppositely directed 56 WASP #b 56 Comet Holmes 56 ESO PR 56 Trifid Nebula 56 planetary nebula 56 Galileo spacecraft 56 proto planetary disk 56 Oort Cloud 56 ionized gases 56 lensing galaxy 56 filamentary structures 56 Gravitational waves 56 moonlets 56 dust devils 56 comet dust 56 electron orbits 55 Toutatis 55 Churyumov Gerasimenko 55 galaxies collide 55 Oort cloud 55 Tycho supernova remnant 55 heliosheath 55 cometary dust 55 comets asteroids 55 photosphere 55 spacecraft flyby 55 coronal mass ejection 55 silicate dust 55 comets 55 magnetopause 55 SOHO spacecraft 55 Saturnian moons 55 planet transits 55 protostar 55 GQ Lupi 55 comet Wild 55 magnetosphere 55 Saturn moon Iapetus 55 Alfven waves 55 NASA Stardust spacecraft 55 comet orbit 55 RXTE 55 supernova explosion 55 corona 55 Nasa spacecraft 55 asteroidal 55 VY Canis Majoris 55 coronal loops 55 gravitationally 55 gravitational interaction 55 Rosette Nebula 55 Ulysses spacecraft 55 magnetospheric 55 redshifted 55 Jupiter moon Io 55 Bug Nebula 55 SN #C 55 Ring Nebula 55 Alfvén waves 55 GJ #b [001] 55 emit X rays 55 Kuiper Belt Objects 55 coronagraph 55 nebulosity 55 coronal loop 55 cumulus cloud 55 muon neutrino 54 Epsilon Eridani 54 gravity warps 54 infalling gas 54 gamma ray photons 54 spectroscopically 54 spacecraft Cassini 54 STEREO spacecraft 54 planet Uranus 54 Eagle Nebula 54 diffraction pattern 54 proto galaxies 54 interstellar particles 54 diffracted 54 interstellar clouds 54 circumstellar disks 54 tidally 54 coronal mass ejections CMEs 54 polar craters 54 Orionids 54 retrograde orbit 54 gaseous planet 54 Virgo Cluster 54 auroral 54 BP Piscium 54 blue supergiant 54 protostars 54 type Ia supernova 54 Upsilon Andromedae 54 Deep Impact probe 54 distant quasar 54 eclipsing binary 54 extrasolar planet HD #b 54 sterile neutrino 54 Aurigid 54 Pluto Charon 54 #P/Churyumov-Gerasimenko 54 Phaethon 54 spherical halo 54 Tauri Sb 54 relativistic jets 54 hydroxyl molecules 54 rotational axis 54 gravitational lens 54 planetesimals 54 Magellanic Stream 54 proplyds 54 Martian dust 54 particles WIMPs 54 circumstellar dust 54 sun corona 54 Saturnian moon 54 glows brightly 54 Stephan Quintet 54 foreground galaxy 54 magnetic reconnection 53 impactor 53 magnetar 53 albedo reflectivity 53 zodiacal light 53 outermost planets 53 ionizes 53 Spitzer infrared spectrograph 53 backscattered 53 Red Rectangle 53 infrared laser beam 53 planets orbits 53 martian atmosphere 53 constellation Aquarius 53 Iapetus 53 galactic clusters 53 ionised 53 moon Mimas 53 Supernova #A 53 interferogram 53 cosmic cannibal 53 electrons positrons 53 Cassini flybys 53 pions 53 penumbral shadow 53 GALEX 53 elliptical galaxy 53 Heliospheric Observatory SOHO 53 HL Tau 53 planetesimal 53 Candor Chasma 53 lunar crust 53 cosmological distances 53 galaxy NGC 53 Crab Pulsar 53 Spitzer infrared 53 gravitational interactions 53 mesocyclone 53 weakly interacting 53 cosmic ray particles 53 Corot 7b 53 lightwaves 53 planets moons 53 moon Deimos 53 relativistic particles 53 Enceladus 53 Phoebe orbits 53 Sagittarius B2 53 Kuiper belt 53 impactor spacecraft 53 ringed planet 53 heliospheric 53 binary quasar 53 solar nebula 53 Earth ionosphere 53 GRB #B 53 Fomalhaut b 53 galactic cosmic rays 53 bolide 53 Saturn Cassini 53 galaxy cluster 53 Mimas 53 aurorae 53 Andromeda galaxy 53 Stardust spacecraft 53 reflection nebula 53 noctilucent clouds 53 Eta Carinae 53 Cosmic Microwave Background 53 quantum tunneling 53 femtosecond timescale 53 dense clumps 53 martian landscape 53 Orion nebula 53 dwarf galaxy 53 fractal pattern 52 Neutron stars 52 icy moons 52 distant galaxy 52 coronal holes 52 galaxy M# [001] 52 cometary material 52 absorbs photons 52 Martian dust devils 52 blazar 52 Horsehead Nebula 52 filamentary 52 type Ia supernovae 52 Hyades cluster 52 Elenin 52 planetary Transits 52 Valles Marineris 52 spatially resolved 52 Comet Encke 52 silicon monoxide 52 red supergiant 52 sunlike star 52 geyser plumes 52 HiRISE camera 52 collisional 52 supernovae explosions 52 Sagittarius dwarf galaxy 52 meteor 52 basaltic lava 52 helium nuclei 52 asteroid 52 ray Space Telescope 52 extrasolar 52 telescope eyepiece 52 planetary nebulae 52 Hot Jupiters 52 ENAs 52 interstellar dust grains 52 planets comets 52 cosmic dust 52 Helix Nebula 52 superposed 52 diffract 52 RS Oph 52 Butterfly Nebula 52 exoplanet orbiting 52 Jenniskens 52 Evolution Explorer 52 nanoribbon 52 occultations 52 ionise 52 Ultraviolet Imaging Spectrograph UVIS 52 Pleiades cluster 52 magnetic excitations 52 flyby spacecraft 52 filamentary structure 52 afterglows 52 twin Voyager spacecraft 52 Saturnian 52 Orion Nebula 52 celestial object 52 supernova remnant 52 magnetic monopoles 52 ESA Rosetta 52 colliding galaxies 52 earthlike planets 52 Gamma rays 52 axions 52 G#.# +#.# 52 Perseid meteor 52 supernova explosions 52 Mössbauer 52 APXS 52 Yarkovsky effect 52 faraway galaxy 52 comet Lulin 52 gamma ray emission 52 Deep Impact craft 52 R Coronae Borealis 52 WISE telescope 52 spiral galaxy NGC 52 neutron star 52 heliosphere 52 inky sky 52 gravitational slingshot 52 reddish orange hue 52 Carina Nebula 52 antimatter particles 52 kaons 52 planets asteroids 52 HiRISE image 52 faint smudge 52 MESSENGER spacecraft 52 HD#b 52 polar stratospheric 52 Comet Hale Bopp 52 Quadrantids 52 Higgs bosons 51 RHESSI 51 gravitationally bound 51 microquasar 51 interstellar space 51 AU Mic 51 Fermi telescope 51 moondust 51 neutralinos 51 lunar craters 51 Saturn Enceladus 51 ferric oxides 51 spaceweather.com 51 Pancam 51 cryovolcanism 51 supernova SN 51 asteroid Eros 51 captured interstellar dust 51 jet contrails 51 crystalline silicates 51 intrinsic brightness 51 NGC #A 51 visible wavelengths 51 molten magma 51 Martian crater 51 meteoroid impacts 51 magma ocean 51 CMB photons 51 NEAs 51 Bok globules 51 Wolf Rayet star 51 starlike 51 planet magnetosphere 51 magnetic polarity 51 shimmering rings 51 constellation Perseus 51 barred spiral galaxy 51 inner Oort Cloud 51 planet WASP #b 51 SN #gy 51 GRB # 51 spacetime 51 faraway galaxies 51 filaments 51 interstellar dust particles 51 gamma rays 51 helium atom 51 Brownian motion 51 detect gamma rays 51 Cometary 51 interstellar magnetic 51 slender crescent 51 cosmic ray 51 exhaust plume 51 Wolf Rayet stars 51 Martian craters 51 Kuiper belt objects 51 Omega Nebula 51 ultraviolet wavelengths 51 stellar occultations 51 Kuiper Belt objects 51 robotic explorer 51 giant elliptical galaxy 51 galactic bulge 51 tholins 51 Solar TErrestrial RElations Observatory 51 diffraction patterns 51 planetary nebulas 51 ionize 51 Caloris 51 Voorwerp 51 infrared satellite imagery 51 mineral olivine 51 starburst galaxy 51 SN#A 51 Distant galaxies 51 GJ #b [002] 51 Caloris Basin 51 electrons emitted 51 Io volcanoes 51 HiRISE camera aboard 51 comet Shoemaker Levy 51 supernova remnants 51 DISR 51 Rosetta lander 51 Orionid 51 scanning electron micrograph 51 Geminid meteors 51 shadowed craters 51 spheroidal 51 NASA Opportunity rover 51 interstellar grains 51 Saturn moon Mimas 51 starbursts 51 Tempel 1 51 particles 51 gamma ray burst 51 haloes 51 Gemini constellation 51 atomic nuclei 51 pulsar 51 highly elliptical orbits 51 Mercury magnetosphere 51 nebula 51 gravitational waves 51 celestial sphere 51 linearly polarized light 51 Type Ia supernova 51 VIRTIS 51 Pleiades star 51 dwarf novae 51 Galaxy Evolution 51 comets orbiting 51 Cassini spacecraft orbiting 51 Kuiper Belt Object 51 Infrared Mapping Spectrometer VIMS 51 Mini TES 51 asteroid Steins 51 X ray emitting 51 Comet Shoemaker Levy 50 interstellar dust tiny 50 merging galaxies 50 Magellanic Clouds 50 moons orbiting 50 lobate scarps 50 planetary surfaces 50 Lagoon Nebula 50 Itokawa 50 exoplanetary 50 chromosphere 50 SNR #-#.# 50 Shoemaker Levy 50 interacting galaxies 50 ultraviolet sunlight 50 quasicrystal 50 hypervelocity 50 binary asteroid 50 comet Churyumov Gerasimenko 50 massless particles 50 Quadrantid meteor shower 50 Solar Dynamics Observatory 50 potassium atoms 50 Muons 50 Sojourner Rover 50 cosmic rays 50 Sojourner rover 50 Saturn moons 50 glow brightly 50 MG J# +# 50 carbon cenospheres 50 runaway thermonuclear 50 Titan smoggy 50 dust motes 50 distant galaxy clusters 50 magnetic monopole 50 millisecond pulsars 50 electron micrograph 50 rotating neutron stars 50 chondrules 50 SMBH 50 gamma ray flares 50 Omega Centauri 50 Cosmic rays 50 Ringed Planet 50 vaporises 50 asteroid collisions 50 Explorer WISE 50 coronal hole 50 gravitational tides 50 nuclei 50 sodium atoms 50 Higgs singlet 50 micrometeoroid impacts 50 constellation Andromeda 50 orbits Saturn 50 HM Cancri 50 fingerlike projections 50 solitons 50 Corot 9b 50 Arsia Mons 50 SIRTF 50 Cassini 50 brightest meteors 50 graphene sheet 50 planets orbiting distant 50 pinwheel shaped 50 Milky Way halo 50 Eta Aquarids 50 Mars Reconnaissance Orbiter MRO 50 Aqua satellite 50 Saturnian moon Titan 50 outer planets 50 yardangs 50 Helix nebula 50 basaltic rocks 50 X ray telescopes 50 Cosmic ray 50 Herbig Ae Be 50 spiral galaxy 50 Venusian atmosphere 50 Orionid meteors 50 gibbous 50 hadrons 50 plasmons 50 subatomic particles 50 retroreflector 50 Ares Vallis 50 GRB# 50 NASA EPOXI mission 50 spicule 50 Jovian moons 50 HIP #b 50 zodiacal dust 50 emitting gamma rays 50 Kuiper Belt object 50 Mandushev 50 Crab Nebula 50 NASA MESSENGER spacecraft 50 terahertz waves 50 nanobubbles 50 constellation Virgo 50 Hanny Voorwerp 50 innermost planet 50 LORRI 50 planemos 50 blazars 50 ultraviolet imaging spectrograph 50 irregularly shaped asteroid 50 globular cluster M# 50 starlight 50 red supergiants 50 protoplanetary discs 50 asteroid Itokawa 50 smallest exoplanet 50 planet Nibiru 50 Dumbbell Nebula 50 diffraction grating 50 Saturn moon 50 spinning neutron 50 Reiner Gamma 50 spherically symmetric 50 rubidium vapor 50 Beta Pictoris 50 prograde 50 distant supernovae 50 Coma Cluster 50 orbiting planets 50 droplets 50 cirrus cloud 50 electron neutrinos 50 baryon 50 comet Hartley 2 49 electrons orbiting 49 star Beta Pictoris 49 planetary orbits 49 Geminga 49 infrared ultraviolet 49 moonquakes 49 shepherding spacecraft 49 AGNs 49 arcsecond 49 wispy clouds 49 proton antiproton 49 galactic magnetic 49 IRAS #-# 49 Orion constellation 49 ionized hydrogen 49 emission nebula 49 Comet LINEAR 49 trans Neptunian objects 49 Hale Bopp 49 neutrino particles 49 gluon 49 rotating neutron 49 evanescent waves 49 interstellar distances 49 Saturn outermost 49 Cassini spacecraft 49 millimeter wavelength 49 supergiant star 49 Saturn outermost ring 49 Comet Elenin 49 quasar 49 gravitational tugs 49 lunar equator 49 ejecta plume 49 coronal heating 49 extrasolar planet 49 noctilucent cloud 49 gravitational radiation 49 planet Gliese #g 49 gamma ray radiation 49 Cat Paw Nebula 49 starquakes 49 heavily cratered 49 Digitized Sky Survey 49 starscape 49 Perseus cluster 49 Syrtis Major 49 wrinkle ridges 49 horseshoe shaped crater 49 x ray beam 49 Galilean moons 49 strange quark 49 tau neutrino 49 ionized atoms 49 Antennae Galaxies 49 faintest galaxies 49 vortices 49 Cherenkov radiation 49 protoplanetary 49 orbital resonance 49 Martian gullies 49 HD #b [002] 49 Leonid meteors 49 polarimetry 49 Meteor showers 49 muons 49 elliptic 49 distant galaxies 49 exoplanets orbiting 49 spiral galaxy Messier 49 Earth radii 49 Methone 49 VLTI 49 moon Phobos 49 Raman spectra 49 superluminal 49 Wolszczan 49 NASA STEREO 49 X ray photons 49 interplanetary spacecraft 49 phyllosilicates 49 alpha particle 49 Martian rocks 49 ecliptic plane 49 Quadrantid 49 Envisat Advanced Synthetic Aperture 49 icy moon Enceladus 49 galactic alignment 49 Robotic Arm Camera 49 galaxy M# [002] 49 IKAROS 49 XO 3b 49 dopant atoms 49 Saturn equinox 49 electrons 49 GJ#b 49 Scanning electron microscope 49 gamma ray photon 49 Encke gap 49 SN #E 49 retrograde orbits 49 SN #D 49 volcanic lava flows 49 Planck satellite 49 hydrated minerals 49 Rosetta spacecraft 49 Swift Ultraviolet Optical 49 wavefronts 49 Comet Swift 49 umbral shadow 49 cystic mass 49 PSR J# 49 Relations Observatory STEREO 49 water vapor 49 Gravitational lensing 49 X ray binaries 49 volcanic plumes 49 # Apophis 49 matter antimatter asymmetry 49 earthwards 49 NASA LCROSS 49 Gliese #e 49 superheated plasma 49 orbited Jupiter 49 Cassini imaging 49 quantum particles 49 protoplanetary disks 49 blobs 49 dust mote 49 pyroclastic flow 49 meteoritic 49 Apophis asteroid 49 Lyman alpha 49 electromagnetic flux 49 quantum superposition 49 detect gravitational waves 49 topological defects 49 Martian surface 49 polygonal shapes 49 Type 1a supernovae 49 olivine mineral 49 Viking landers 49 planet gravitational tug 49 magnetic dynamo 49 Saturn moons Titan 49 Comet #P/Churyumov-Gerasimenko 49 Infrared Thermal Imaging Spectrometer 49 Arches Cluster 49 RRATs 49 starburst galaxies 49 CMB radiation 49 galactic cores 49 proto planetary disks 49 Comet #P/Holmes 49 linearly polarized 49 impactors 49 nucleosynthesis 49 Cerberus Fossae 49 supernova 49 infrared radiation 49 Gliese #c 49 TRMM satellite 49 bosonic 49 Cassini Huygens spacecraft 49 fainter objects 49 clumpy soil 49 Grillmair 49 beam splitter 49 microlens 49 Cosmic Microwave Background CMB 49 Nasa Mars Reconnaissance 49 ecliptic 49 Martian terrain 49 Zeta Ophiuchi 49 phosphorescence 49 J# +# [002] 49 helium ions 48 turbulent eddies 48 galactic mergers 48 soundwaves 48 photons emitted 48 Orbiter LRO 48 perihelion 48 rubidium atom 48 constellation Centaurus 48 planetary embryos 48 lowermost mantle 48 convective clouds 48 TrES 4 48 electron orbiting 48 BP Psc 48 Jupiter gravitational pull 48 heliopause 48 branes 48 antiproton 48 emits X rays 48 comet Tempel 1 48 hydrogen nuclei 48 Veil Nebula 48 particle analyzers 48 electron density 48 Bose Einstein condensates 48 exo planets 48 Herschel Crater 48 ESO VLT 48 synchronous polar 48 onrushing comet 48 constellation Cassiopeia 48 plasmasphere 48 laser pulse 48 spectral measurements 48 gravitational keyhole 48 arcminutes 48 incandescent lava 48 sunward 48 gravitational microlensing 48 Samuel Oschin Telescope 48 nucleons 48 Kelvin Helmholtz 48 fuzzy halo 48 molten rock 48 micron wavelengths 48 graceful arcs 48 micrometre sized 48 magnetic fields 48 X ray observatory 48 electromagnetic signals 48 cosmic microwave background 48 Deep Impact comet 48 filament 48 neutrino 48 synchrotron emission 48 Delta Cephei 48 Moderate Resolution Imaging 48 Leonid meteor 48 OGLE TR #b 48 auroras 48 Shepherding Spacecraft 48 spectral fingerprints 48 infalling matter 48 coronal mass ejections 48 DNA helix 48 Ranging spacecraft 48 particle 48 Clementine spacecraft 48 dust particles 48 astronomical objects 48 refracts light 48 CoRoT satellite 48 post perovskite 48 cosmic collisions 48 XMM Newton 48 Dust devils 48 orbital eccentricity 48 ESA XMM Newton 48 Mars Orbiter 48 volcanic plume 48 permanently shadowed craters 48 Martian atmosphere 48 novas 48 Sensing Satellite LCROSS 48 meteoritic material 48 micrograph 48 mantle convection 48 energetic cosmic rays 48 neutralino 48 elliptical galaxy NGC 48 droplet 48 cluster NGC 48 Sombrero Galaxy 48 IRAS 4B 48 spaceward 48 active galactic nucleus 48 Trapezium 48 Lyrids 48 Saturn aurora 48 Supernovae 48 circularly polarized light 48 elliptical orbits 48 particle beam 48 radial velocity 48 NASA Cassini 48 planetoids 48 Planck telescope 48 colloidal crystals 48 highly magnetized neutron 48 THz radiation 48 Jovian moon 48 Doppler shifts 48 fading afterglow 48 deuterium atoms 48 lithium atoms 48 Geminid 48 bluish glow 48 greenish glow 48 lithosphere 48 faint wisps 48 subsurface ocean 48 EPOXI 48 meteor impacts 48 Jovian atmosphere 48 Perseid shower 48 Scanning electron micrograph 48 tidal bulge 48 crystal lattices 48 Global Surveyor spacecraft 48 cosmic strings 48 Imaging Spectroradiometer MODIS instrument 48 plasmon 48 Eridani 48 spherules 48 Perseid meteors 48 Opportunity rover 48 maser emission 48 quark gluon plasma 48 Mars moon Phobos 48 antiprotons 48 YORP effect 48 moon Mab 48 dynamical 48 constellation Carina 48 whorl 48 waxing gibbous moon 48 spicules 48 rover Opportunity 48 ultracold gas 48 SN #cr 48 Orionid meteor shower 48 bilayer 48 Gerard Kuiper 48 volcanic moon Io 48 magnetic 48 Orbiter MRO 48 LCROSS spacecraft 48 surface plasmons 48 globular 48 Andromeda Galaxy 48 Messenger spacecraft 48 lipofuscin 48 NASA Wilkinson Microwave 48 Electron microscopy 48 Gamma ray bursts 48 X ray wavelengths 48 ionosphere 48 oblique angle 48 exo planet 48 de Pater 48 Mars Odyssey spacecraft 48 constellation Leo 48 planetary magnetospheres 48 galactic collisions 48 photons 48 ultraviolet photons 48 #P/Holmes 48 convex lens 48 CoRoT 7b 48 lava fountains 48 muon 48 pebble sized 48 comet nuclei 48 IRC +# 48 Geminids meteor shower 48 sulfate aerosols 48 Olympus Mons