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(Click for frequent words.) 64 intrinsic brightness 63 permanently shadowed craters 63 Phoebe orbits 60 Cosmic rays 60 Gamma ray bursts 60 Oort cloud 60 gamma rays emitted 60 Oort Cloud 59 protoplanet 59 meteoritic material 59 smallest exoplanet 58 Kuiper Belt Object 58 emit X rays 58 infalling 58 comets orbiting 58 galactic disk 58 retrograde orbits 58 subsurface ocean 58 Upsilon Andromedae 58 comet Tempel Tuttle 58 Galactic cosmic rays 58 Upsilon Andromedae b 58 cosmological distances 58 moons orbiting 58 lunar crust 58 Geminga 58 elongated orbits 58 Kuiper belt object 58 silicon monoxide 57 Bug Nebula 57 AGNs 57 Martian dust 57 protoplanetary 57 Kuiper belt 57 Earthlike planet 57 retrograde orbit 57 asteroids comets 57 Corot 9b 57 Earth magnetotail 57 Epsilon Eridani 57 periodic dimming 57 IRC +# 57 exo planets 57 outer corona 57 Fermi telescope 57 circumstellar 57 Evolution Explorer 57 extrasolar 57 Fomalhaut b 57 Aurigid 57 coronal holes 57 Gravitational waves 57 gravitationally bound 57 energetic cosmic rays 56 Meteor showers 56 neutralinos 56 X ray binaries 56 shadowy craters 56 planet Gliese #g 56 matter antimatter asymmetry 56 type Ia supernova 56 Gliese #c 56 comet McNaught 56 Orionids 56 whiz harmlessly 56 Tempel Tuttle 56 Epsilon Aurigae 56 MG J# +# 56 accretion disks 56 Galileo spacecraft 56 cosmic ray particles 56 Higgs bosons 56 GJ #b [002] 56 energetic electrons 56 Kuiper Belt Objects 56 magnetars 56 planets orbits 56 cometary material 56 Corot 7b 56 spacecraft flyby 55 AB Aurigae 55 Type Ia supernova 55 cosmic cannibal 55 Kuiper belt objects 55 antineutrinos 55 transiting exoplanet 55 cometary dust 55 Orionid meteors 55 protoplanets 55 Gamma rays 55 Comet Elenin 55 Martian permafrost 55 exoplanets planets 55 Bok globules 55 moon Io 55 Astrological lore 55 planemos 55 WASP #b 55 P/# A2 55 comet orbit 55 brightest supernova 55 SN #gy 55 jovian 55 shadowed craters 55 airglow 55 icy moons 55 Toutatis 55 EPOXI spacecraft 55 polar craters 55 planet HD #b 55 nebular 55 SN #A 55 spherical halo 55 moonquakes 55 olivine mineral 55 Samuel Oschin Telescope 55 X ray emission 55 Jupiter Ganymede 55 gaseous planets 55 Saturn Cassini 54 Earth radii 54 Comet Encke 54 Kepler 9c 54 Saturn moon Mimas 54 spectroscopically 54 constellation Aquarius 54 meteoroid 54 Comet Halley 54 interstellar cloud 54 BP Piscium 54 Solar flares 54 Jupiter moon Io 54 magnetic monopole 54 planet magnetosphere 54 Mandushev 54 cryovolcanism 54 OGLE TR #b 54 transiting planet 54 Hanny Voorwerp 54 moon Mimas 54 planetary Transits 54 interstellar dust clouds 54 Perseus constellation 54 proplyds 54 SCP #F# 54 HL Tau 54 SN #D 54 interstellar clouds 54 protoplanetary disc 54 gamma ray flashes 54 highly elliptical orbits 54 red supergiant 54 TGFs 54 galactic cosmic rays 54 transiting planets 54 Elenin 54 Orionid 54 comet nucleus 54 radioactive nuclei 54 electrons positrons 54 planetary orbits 54 Quadrantid meteor shower 54 interstellar dust particles 54 X ray afterglow 54 Red Rectangle 54 Cabeus crater 54 spectral measurements 54 icy comets 54 Comet Hartley 2 54 filamentary structure 54 trans Neptunian objects 54 protoplanetary disks 54 distant supernovae 54 IntergalaticEarth 54 asteroidal 54 photosphere 54 geoneutrinos 54 exosphere 54 Saturn moons 54 RHESSI 54 mineral olivine 54 Cancri e 53 sterile neutrino 53 gravitational interaction 53 VY Canis Majoris 53 proton antiproton 53 QQ# 53 Eta Carinae 53 galaxy M# [001] 53 innermost planet 53 elliptical orbits 53 millisecond pulsars 53 eclipsing binary 53 lensing galaxy 53 gamma ray observatory 53 Mercury magnetosphere 53 planets asteroids 53 vaporises 53 HD#b 53 baryonic 53 Cosmologists 53 Wolf Rayet stars 53 protoplanetary disk 53 volcanic moon Io 53 asteroid collisions 53 GJ#b 53 supersymmetric particles 53 spiral nebulae 53 protostars 53 RRATs 53 baryonic matter 53 BLG #Lb 53 Saturn Enceladus 53 SN#A 53 Earthlike 53 silicate dust 53 TrES 4 53 lobate scarps 53 filamentary structures 53 Cosmic Microwave Background 53 Eagle Nebula 53 Type Ia supernovas 53 ray Space Telescope 53 circumstellar disk 53 Magnetic reconnection 53 V# Mon 53 gaseous planet 53 infall 53 X rays gamma rays 53 axions 53 Earthlike planets 53 Saturn equinox 53 Saturn magnetosphere 53 Mars Squyres 53 GZK cutoff 53 comets asteroids 53 spinning neutron 53 explosive volcanism 53 moon Enceladus 53 Gemini constellation 53 Ringed Planet 53 BP Psc 53 moon Deimos 53 distant galaxy clusters 53 exoplanet orbiting 53 Jenniskens 53 CoRoT 9b 53 gamma ray flares 52 exo planet 52 solar corona 52 missing baryons 52 planets orbiting distant 52 Kepler #b 52 gravitational pulls 52 Ulysses spacecraft 52 proto cluster 52 Cepheids 52 constellation Eridanus 52 sunlike stars 52 Lyrids 52 eclipsing binaries 52 cometary impacts 52 active galactic nucleus 52 hydrologist Carolyn Driedger 52 quantum particle 52 Comet Lulin 52 magma boiling 52 HM Cancri 52 smallest exoplanets 52 highly magnetized neutron 52 Avishay Gal Yam 52 geologically active 52 magnetar 52 distant supernovas 52 coronal mass ejections CMEs 52 GRB #B 52 moonlets 52 Earth ionosphere 52 YORP effect 52 Nasa spacecraft 52 rotating neutron 52 Perseus Cluster 52 comets 52 neutron spectrometer 52 AU Mic 52 primitive meteorites 52 Geminid 52 eccentric orbits 52 merging galaxies 52 sized planets orbiting 52 Swift Tuttle 52 occultations 52 Neutron stars 52 Uranus Neptune 52 hydrated minerals 52 habitable worlds 52 circumstellar disks 52 Voorwerp 52 Comet NEAT 52 Fermi LAT 52 Saturn rings 52 carbonaceous chondrite 52 ionized gases 52 foreground galaxy 52 solar nebula 52 cosmological theories 52 smoothest flattest spot 52 Jovian moons 52 metallicity 52 MN4 52 Saturn auroras 52 #P/Churyumov-Gerasimenko 52 exoplanets orbiting 52 Omega Centauri 52 lunar craters near 52 Cassini flybys 52 gamma rays 52 asteroids orbiting 52 Libra constellation Vogt 52 millisecond pulsar 52 diffuse aurora 52 Pluto Eris 52 molten magma 52 radial velocity method 52 stony meteorites 52 Quadrantids 52 carbonaceous chondrites 52 GJ #b [001] 52 helium atoms 52 blazar 52 galaxy M# [002] 52 planetary nebulae 52 elliptical galaxy NGC 52 extrasolar planets orbiting 52 luminosities 52 afterglows linger 52 Astrophysicists 52 hydroxyl molecules 52 planets circling stars 52 emit gamma rays 52 Saturn outermost 52 permanently shadowed 52 crystalline silicates 52 Pluto Charon 52 constellation Gemini 52 Comet 9P/Tempel 1 52 solar prominences 52 inhabitable planets 52 KBOs 51 moon Mab 51 lunar craters 51 Scientists theorized 51 electron neutrinos 51 planet Uranus 51 hunting Kepler telescope 51 globular star 51 CoRoT satellite 51 CMB radiation 51 NASA Lunar Prospector 51 microlensing events 51 masers 51 planets comets 51 # Apophis 51 antineutrino 51 interstellar particles 51 cosmic phenomena 51 RY Sagittarii 51 Type Ic supernovae 51 Beta Pictoris 51 stellar occultations 51 Ring Nebula 51 specular reflection 51 Saturnian moons 51 starquakes 51 particles WIMPs 51 neutron radiation 51 Magnetars 51 GRB #A 51 G#.# +#.# 51 planets orbiting stars 51 Kuiper Belt objects 51 protostar 51 galactic cosmic radiation 51 Comet Holmes 51 electromagnetic signals 51 lunar equator 51 zodiacal light 51 comet tail 51 supergiant stars 51 blue supergiant 51 dwarf galaxy 51 constellation Carina 51 Stephan Quintet 51 weakly interacting 51 Explosive eruptions 51 slender crescent 51 proto galaxies 51 comets meteors 51 Veil Nebula 51 stellar occultation 51 sunlike star 51 dwarf spheroidal galaxies 51 Phaethon 51 Hot Jupiters 51 RXTE 51 hypernova 51 lunar perigee 51 spherically symmetric 51 exoplanetary 51 proto planetary disk 51 outermost planets 51 RQ# 51 comets moons 51 Ontario Lacus 51 midlatitudes 51 X ray observatory 51 Comet Tempel Tuttle 51 Alfven waves 51 Zolensky 51 electrons protons 51 red supergiants 51 Maunder minimum 51 orbiting Chandra 51 orbiting planets 51 mineralogical composition 51 Antennae Galaxies 51 NEAs 51 Candor Chasma 51 planet gravitational tug 51 Shackleton crater 51 galactic cosmic ray 51 Triangulum Galaxy 51 microquasar 51 dimming starlight 51 Seyfert galaxies 51 NGC #A 51 moonlet 51 elliptical galaxy 51 rotating neutron stars 51 distant quasars 51 silicate grains 51 luminous galaxies 51 X ray binary 51 interstellar dust 51 occulted 51 interstellar grains 51 Mini TES 51 Wilkinson Microwave Probe 51 Manned missions 51 perihelion 51 magnetospheric 51 meteoroid impacts 51 Comet Hartley 51 magnetic substorms 51 active galactic nuclei 51 Milky Way halo 51 Geminids 51 permanently shadowed lunar 51 Geminid shower 51 micrometeoroid impacts 51 transiting exoplanets 51 SOHO spacecraft 51 gamma ray emission 51 protons collide 51 galactic clusters 51 reionization 50 planetary embryos 50 volcanically active 50 lunar poles 50 magnetopause 50 radial velocity technique 50 ionise 50 Saturn moon Enceladus 50 SN #C 50 cosmic strings 50 Weakly Interacting Massive Particles 50 Neptune Uranus 50 KT extinction 50 planets orbiting sun 50 distant quasar 50 polar mesospheric clouds 50 gravitational tugs 50 Orcus Patera 50 coronal loops 50 moons circling 50 methyl cyanide 50 detect gamma rays 50 Fornax cluster 50 Comet McNaught 50 telescope eyepiece 50 smallest extrasolar planet 50 novas 50 Galilean moons 50 Orion constellation 50 orbiting Cassini spacecraft 50 GRBs 50 ROSAT 50 gamma ray photons 50 Hipparcos 50 gravitational interactions 50 WISE spacecraft 50 Saturn moons Enceladus 50 Lyman alpha 50 arcseconds 50 YU# 50 globular cluster 50 Martian rovers 50 dynamical evolution 50 exerts gravitational pull 50 constellation Taurus 50 redshifts 50 RX J# 50 planet transits 50 dirty snowballs 50 Arches Cluster 50 Gliese #G 50 solar neutrinos 50 liquid ethane 50 VHE gamma rays 50 hypervelocity stars 50 PSR B# 50 orbited Jupiter 50 isostatic rebound 50 Ground penetrating radar 50 ionizes 50 Geminid meteors 50 substorm 50 Type Ia 50 Cosmic ray 50 Saturn moons Titan 50 moon Phobos 50 van Arkel discovery 50 ionised gas 50 Venus Neptune Uranus 50 interstellar dust grains 50 brown dwarfs 50 comet 50 planet Nibiru 50 cosmic ray flux 50 Doppler shifts 50 Grillmair 50 Anthony Remijan 50 HD #b [002] 50 ammonia hydrates 50 Hellas Basin 50 ah dus 50 Bonnie Buratti 50 Cygnus Lyra region 50 TNOs 50 noble gases 50 redshifted 50 APXS 50 moon Europa 50 Henize #-# 50 impactors 50 Galaxy Evolution 50 Gliese #g 50 relativistic particles 50 meteoroids 50 extrasolar worlds 50 fading afterglow 50 aurorae 50 spacecraft orbiting 50 gamma ray emitting 50 spinning neutron stars 50 Perseid meteors 50 cosmic ray electrons 50 cometary 50 Heliospheric Observatory SOHO 50 Quadrantid 50 ESA XMM Newton 50 Deep Impact craft 50 backscattered 50 cosmic rays 50 Crab pulsar 50 mysterious uncharted 50 moons Europa 50 NASA Voyager spacecraft 50 emits X rays 50 superfluids 50 radial velocity 50 prograde 50 Gamma ray bursts GRBs 50 Io Europa 50 Crab Nebula 50 distant galaxies 50 submillimeter galaxies 50 habitable zones 50 gravitational tides 50 Sagittarius dwarf galaxy 50 geologist Jennifer Adleman 50 icy moon Enceladus 50 Solar TErrestrial RElations Observatory 50 bedrock outcropping 50 Dwarf galaxies 50 chondrules 50 Apophis asteroid 50 observable universe 50 spatially resolved 50 Jupiter moons 50 polar stratospheric 50 binary asteroids 50 maser emission 50 Neptune Jupiter 50 moons orbiting Saturn 50 HiRISE image 50 galactic mergers 50 twin STEREO spacecraft 49 isotopic ratios 49 glows brightly 49 Saturn moon 49 Comet Hale Bopp 49 ionized hydrogen 49 Tharsis Rise 49 permanently shadowed regions 49 spectral fingerprint 49 Wolszczan 49 supernova SN 49 gravitational keyhole 49 precessing 49 Gravitational lensing 49 penumbral lunar eclipse 49 antimatter particles 49 XTE J# 49 IRAS #-# 49 extragalactic 49 Delta Cephei 49 Jovian moon 49 constellation Perseus 49 Saturn moon Iapetus 49 spacecraft orbited 49 Coma cluster 49 Anisotropy Probe WMAP 49 Mount Bosavi 49 moon Ganymede 49 Cassini flyby 49 Pegasus constellation 49 Earthly contamination 49 Extrasolar planets 49 Haumea 49 RS Ophiuchi 49 micro meteorites 49 submillimeter wavelength 49 PSR J# 49 habitable planets 49 GRB# 49 Gliese #e 49 Supernova #A 49 relativistic jets 49 extrasolar planet 49 tephra dam 49 CoRoT #b 49 Galilean satellites 49 COROT 7b 49 silicates 49 Orion nebula 49 HESS telescopes 49 Vourlidas 49 Voyager spacecraft 49 chemical abundances 49 Lulin 49 waxing gibbous moon 49 Aram Chaos 49 Saturnian moon 49 ejecta 49 Fetal heartbeats 49 gravitational microlensing 49 albedo reflectivity 49 comet nuclei 49 ionized particles 49 Planetary nebulae 49 celestial equator 49 dusty disks 49 aphelion 49 mesosphere 49 Lagoon Nebula 49 axial tilt 49 extrasolar planet HD #b 49 galactic bulge 49 Venusian atmosphere 49 Jupiter magnetosphere 49 retroreflector 49 type Ia supernovae 49 fissure eruption 49 X ray spectrometer 49 moons Phobos 49 refrozen ice 49 Noctilucent clouds 49 gravitational lenses 49 planetary nebula 49 Geminids meteor shower 49 Earth orbiting satellites 49 elemental abundances 49 tholins 49 X ray pulses 49 GA6 49 Gliese #d 49 unaided eye 49 Pleiades cluster 49 Beta Pictoris b 49 spherules 49 KT boundary 49 gravitational lens 49 helium nuclei 49 constellation Ursa Major 49 accretion disk 49 meteor fragment 49 brightest meteors 49 Earth asteroids NEAs 49 orbiting 49 PSR B# +# 49 Makemake 49 Kuiper Belt object 49 UDFy # 49 Ultraviolet radiation 49 VLBA observations 49 globular clusters 49 ultraviolet radiation emitted 49 Svedhem 49 binary quasar 49 gravitational radiation 49 constellation Lacerta 49 globulars 49 geothermal gradient 49 orbiting Mars Odyssey 49 gluon 49 problem Bellau 49 Type Ia supernovae 49 waxing crescent 49 comet flyby 49 WISE telescope 49 non baryonic 49 Cassini spacecraft orbiting 49 planets Uranus 49 ionize 49 Heliospheric Observatory 49 -# degrees centigrade [001] 49 chlorine monoxide 49 Merapi crater 49 SMBH 49 geyser plumes 49 constellation Cetus 49 Fashion Movie Reviews 49 celestial phenomena 49 Saturn Jupiter Uranus 49 gamma ray spectrometer 49 glow brightly 49 planetary nebulas 49 Radioactive substances 49 Wolf Rayet star 49 microplastics 49 Nibiru 48 IBEX spacecraft 48 planetary astronomer 48 lunar meteorites 48 star Beta Pictoris 48 Lunar eclipses 48 faint galaxies 48 planets constellations 48 heliospheric 48 SN #E 48 distant galaxy 48 Comet Churyumov Gerasimenko 48 Mars Neptune Uranus 48 super perigee moon 48 exosolar planets 48 X ray wavelengths 48 strangelet 48 extrasolar planetary 48 celestial object 48 Martian microbes 48 silicate rocks 48 gravitational perturbations 48 Rosetta lander 48 Viking Orbiter 48 cosmic microwave radiation 48 Nili Fossae 48 undiscovered particle 48 assumed planets circling 48 Spinal fluid 48 Jedicke 48 Zeta Ophiuchi 48 HD# [002] 48 Phys. Rev. Lett 48 radioactive decay 48 neutrino particles 48 planet orbits 48 graphite whiskers 48 martian atmosphere 48 Gamma ray burst 48 infalling gas 48 comet Lulin 48 supernova explosion 48 Charon Pluto 48 Churyumov Gerasimenko 48 muons 48 Io volcanoes 48 constellation Bootes 48 GQ Lupi 48 NASA EPOXI mission 48 constellation Aquila 48 electron neutrino 48 airbursts 48 magnetic reconnection 48 Comet Machholz 48 galactic cores 48 Microbursts 48 Virgo Cluster 48 Hyakutake 48 hematite mineral 48 orbiting gamma ray 48 superheavy elements 48 gaseous methane 48 earths surface 48 coronal heating 48 COROT exo 3b 48 Cherenkov radiation 48 nebulae 48 astrophysicists 48 constellation Auriga 48 Muons 48 Gaensler 48 galactic halo 48 erupt explosively 48 airgel collector 48 constellation Sagittarius 48 Taurids 48 HD #b [001] 48 astronomer Clyde Tombaugh 48 hydrogen nuclei 48 sulfate aerosols 48 prebiotic molecules 48 starlike 48 kaons 48 inhomogeneities 48 supernova explosions 48 Type 1a supernovae 48 Magellanic Stream 48 giant gaseous planets 48 cometary debris 48 orbital resonance 48 Syrtis Major 48 Gamma ray 48 Isidis Planitia 48 planet WASP #b 48 NASA Kepler telescope 48 supernova remnant 48 asteroid Steins 48 Global Surveyor spacecraft 48 nuclides 48 supergiant star 48 cluster NGC 48 comet Hale Bopp 48 Higgs particle 48 brown dwarf 48 orbiting Kepler telescope 48 photochemical reactions 48 permanently shadowed crater 48 binary asteroid 48 fault scarps 48 earthshine 48 radioactive nuclides 48 galactic alignment 48 invisible odorless tasteless 48 Adam Riess 48 galactic equator 48 N. Rathnasree 48 dynamical processes 48 WMAP satellite 48 CoRoT 7b 48 microscopic specks 48 Jupiter icy moons 48 planetoid 48 gravity warps 48 Subatomic particles 48 Gamma Virginids 48 electron orbits 48 eclogitic 48 Halemaumau 48 fainter objects 48 muon neutrinos 48 Douri whereabouts 48 superdense 48 gamma ray bursts GRBs 48 axis wobbles 48 Sasselov 48 gamma ray burst 48 planetoids 48 X ray observatories 48 Quaoar 48 Caesium 48 Higgs boson particle 48 occultation 48 hazardous eruption 48 supermassive 48 deuterium atoms 48 emits alpha 48 amateur skywatchers 48 Comet #P/Churyumov-Gerasimenko 48 supernovae explode 48 Andromeda galaxy 48 asteroid impacts 48 Titan smoggy 48 primordial ingredients 48 stellar seismology 48 X ray emitting 48 Eridani 48 ionized gas 48 emission nebula 48 magma ocean 48 Mars moon Phobos 48 active volcanism 48 sundog 48 chromosphere 48 Alfvén waves 48 CAIs 48 Aqua satellite 48 gray hematite 48 constellation Virgo 48 comet dust 48 rotational axis 48 extraterrestrial UFOs 48 star Spica 48 geomagnetic activity 48 nucleosynthesis 48 particles emitted 48 interplanetary spacecraft 48 ULP cepheids 48 infrared spectra 48 Pavonis Mons 48 Neanderthals Homo neanderthalensis 48 TODAY Showers 48 equatorial regions 48 orbits 48 emits gamma rays 48 super Earths 48 called gravitational microlensing 48 plutoids 47 Cat Paw Nebula 47 dwarf galaxies 47 neighboring Andromeda galaxy 47 irregularly shaped asteroid 47 Palaeozoic sedimentary 47 Guatemala sinkhole 47 spacecraft thrusters 47 NASA Cassini orbiter 47 NFIRE satellite 47 planets circling 47 Butterfly Nebula 47 Enceladus 47 galaxy redshift 47 infrared telescopes 47 tidal tails 47 Helix Nebula 47 Trojan asteroids 47 Leonids 47 asteroid 47 electrons orbiting 47 Comet Swift 47 martian rocks 47 Sara Seager 47 Sagittarius B2 47 Ultraviolet Imaging Spectrograph UVIS 47 ionised 47 colorless odorless radioactive 47 planet orbiting 47 Gerhard Schwehm 47 sterile neutrinos 47 True thicknesses 47 planetary magnetospheres 47 Cabeus 47 magnetotail 47 Mercury exosphere 47 comet particles 47 protoplanetary discs 47 WD5 47 coronal loop 47 Uranus Jupiter 47 Earth magnetosphere 47 exoplanets planets outside 47 Pieter van Dokkum 47 Relations Observatory STEREO 47 Deep Impact comet 47 Cometary 47 Ranging spacecraft 47 Klekociuk 47 Jupiter Saturn 47 WIMPs 47 hydrothermal magnetite 47 neutralino 47 extraterrestrial civilizations 47 NASA Stardust spacecraft 47 celestial sphere 47 micrometeoroids 47 magnetosphere 47 astronomical objects 47 mu Arae 47 quantum mechanically 47 auroral activity