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(Click for frequent words.) 65 Pluto Charon 64 Kuiper Belt object 63 Galilean satellites 63 exoplanetary 62 gaseous planet 62 Corot 7b 62 extrasolar planet 61 Galilean moons 61 Earthlike planets 61 moons orbiting 61 extrasolar planets 60 planet Uranus 60 GJ#b 60 extrasolar 60 galaxy M# [001] 60 Kuiper belt objects 60 moons Phobos 60 Comet Lulin 60 icy moons 60 Galileo spacecraft 60 HD#b 60 asteroid Vesta 60 fainter objects 60 Antennae Galaxies 60 exoplanet 59 WASP #b 59 moon Titan 59 Fomalhaut b 59 Saturnian moon Titan 59 planemos 59 planets Uranus 59 Upsilon Andromedae 59 Kuiper Belt objects 59 Beta Pictoris b 59 KBOs 58 HD #b [002] 58 planet orbits 58 asteroid Ceres 58 Kuiper Belt Objects 58 infrared telescopes 58 planets 58 gamma ray observatory 58 moon Io 58 transiting planets 58 innermost planet 58 planet orbiting 58 planets orbiting 58 comets orbiting 58 largest moon Charon 58 outer planets 58 GJ #b [001] 57 Saturn Cassini 57 sunlike star 57 Kuiper Belt Object 57 exoplanets planets 57 Galaxy Evolution 57 Andromeda galaxy 57 OGLE TR #b 57 Churyumov Gerasimenko 57 Comet #P/Churyumov-Gerasimenko 57 moons Io 57 exoplanets orbiting 57 Comet Hartley 2 57 ringed planet 57 moons 57 smallest exoplanet 57 Titan Saturn 57 Cancri 57 Epsilon Eridani 57 TrES 4 57 transiting planet 57 exo planet 57 distant supernovae 57 Kepler #b 57 Zeta Ophiuchi 57 Comet Halley 57 asteroid 57 moons Europa 57 trans Neptunian objects 57 Cancri e 57 exoplanets 56 Orbiter LRO 56 comet nucleus 56 Cassini flyby 56 NASA rovers Spirit 56 planets orbits 56 Gliese #e 56 Omega Centauri 56 Gliese #g 56 asteroid Steins 56 Kuiper belt object 56 Giovanni Cassini 56 GALEX 56 Kuiper belt 56 Jovian moons 56 Saturnian moon 56 asteroids orbiting 56 impactor spacecraft 56 laser altimeter 56 planets orbiting sun 56 LORRI 56 moon Ganymede 56 slender crescent 56 planets circling 56 outer corona 56 P/# A2 56 Jupiter Saturn Uranus 56 Fermi telescope 56 NASA Cassini spacecraft 56 extrasolar planetary systems 56 asteroids 56 Venusian atmosphere 56 comet 56 Virgo Cluster 56 New Horizons spacecraft 56 Pluto Eris 55 BLG #Lb 55 VIRTIS 55 Solar TErrestrial RElations Observatory 55 Upsilon Andromedae b 55 comet Lulin 55 SOHO spacecraft 55 CoRoT #b 55 gaseous planets 55 NASA MESSENGER spacecraft 55 WISE infrared 55 planet Gliese #g 55 Saturnian moons 55 airglow 55 rocky planets 55 GJ #b [002] 55 HL Tau 55 Charon Pluto 55 cometary debris 55 flyby Cassini 55 SIRTF 55 microlensing events 55 Oort cloud 55 dwarf planet 55 telescopic observations 55 hydrated minerals 55 subsurface ocean 55 earthshine 55 asteroids comets 55 infrared telescope 55 phyllosilicates 55 Saturn moons 55 Andromeda Galaxy 55 earthlike planets 55 Ring Nebula 55 inhabitable planets 54 star Gliese 54 Neptune Uranus 54 Comet Machholz 54 infrared observatory 54 COROT 54 plutoids 54 jovian 54 moonlets 54 found circling Gliese 54 APXS 54 moons circling 54 merging galaxies 54 Saturn moon 54 COROT exo 3b 54 BP Psc 54 lunar craters 54 moon Mab 54 Jupiter moon Io 54 Makemake 54 astronomer Clyde Tombaugh 54 Epsilon Aurigae 54 Rosetta spacecraft 54 occultations 54 moon Enceladus 54 brown dwarf 54 microlensing 54 Comet Holmes 54 protoplanet 54 Lunar Reconnaissance Orbiter LRO 54 comet Churyumov Gerasimenko 54 EPOXI mission 54 Cygnus Lyra region 54 Milky Way Galaxy 54 Sojourner rover 54 astronomers 54 GQ Lupi 54 CoRoT 7b 54 Deep Impact eXtended Investigation 54 star Proxima Centauri 54 comet McNaught 54 Cassini 54 planets orbiting stars 54 Science Experiment HiRISE 54 flyby spacecraft 54 super Earths 54 unaided eye 54 Konacki 54 Earthlike 54 CRISM 54 comet #P/Churyumov-Gerasimenko 54 Olympus Mons 54 Ranging spacecraft 54 Delta Cephei 54 spacecraft flyby 54 Spitzer Space Telescope 54 TrES 54 Hot Jupiters 54 X ray wavelengths 54 XMM Newton 54 Cassini Huygens 54 stellar occultation 54 planetary Transits 54 Wolszczan 54 bedrock outcropping 54 Oort Cloud 54 heavily cratered 54 Comet Tempel Tuttle 54 robotic explorer 54 interstellar boundary 54 NASA EPOXI mission 54 gravitational microlensing 54 constellation Lyra 54 X ray telescopes 54 AU Mic 54 ESA Huygens probe 54 EPOXI 54 THEMIS spacecraft 53 orbiting Hubble Space Telescope 53 MG J# +# 53 Saturn rings 53 distant quasars 53 sunlike stars 53 cosmological distances 53 HiRISE image 53 Explorer WISE 53 Samuel Oschin Telescope 53 dwarf planets 53 planets orbiting distant 53 NASA Cassini 53 Quaoar 53 Uranus Neptune 53 elongated orbits 53 volcanic moon Io 53 Kepler observatory 53 Clyde Tombaugh discovered 53 astronomical objects 53 Milky Way galaxy 53 THEMIS 53 Corot 9b 53 Viking landers 53 Saturn outermost moon 53 Orion nebula 53 Rosetta orbiter 53 Io Europa 53 MESSENGER 53 Saturnian system 53 Kepler 9c 53 Orion Nebula 53 Gliese #d 53 extrasolar planets orbiting 53 Stephan Quintet 53 Martian arctic 53 COROT 7b 53 moon Phobos 53 orbits 53 Europa Ganymede 53 Saturn Jupiter Uranus 53 Kepler telescope 53 martian surface 53 ecliptic plane 53 coronal loops 53 Martian craters 53 cosmic cannibal 53 Toutatis 53 Dumbbell Nebula 53 orbiting 53 lensing galaxy 53 Comet Hartley 53 binary asteroid 53 exo planets 53 Infrared Array Camera 53 CoRoT satellite 53 NASA STEREO 53 sized planets orbiting 53 mu Arae 53 Hanny Voorwerp 53 twin rover Opportunity 53 Evolution Explorer 53 celestial sphere 53 millisecond pulsar 53 Jovian moon 53 occulted 53 orbiting Saturn 53 Planck satellite 53 Cassini spacecraft 53 NASA rovers 53 Gliese #c 53 Mercury flyby 53 Earthlike planet 53 Cassini orbiter 53 Herschel Space Telescope 53 unmanned probes 53 NASA Mars Reconnaissance 53 Mars Color Imager 53 flyby 52 RXTE 52 HiRISE camera 52 KH #D 52 astrophysical phenomena 52 Caloris Basin 52 whiz harmlessly 52 constellation Virgo 52 elliptical galaxy 52 #P/Churyumov-Gerasimenko 52 SDSS II 52 NASA Lunar Reconnaissance 52 constellation Ursa Major 52 olivine mineral 52 SN #C 52 cometary 52 Pluto 52 axions 52 optical telescopes 52 arcminutes 52 NASA Kepler spacecraft 52 constellation Hercules 52 Viking Lander 52 rocky extrasolar planet 52 MESSENGER spacecraft 52 distant supernovas 52 IBEX spacecraft 52 THEMIS satellites 52 Orbiter MRO 52 Syrtis Major 52 Mars Reconnaissance Orbiter 52 Orionids 52 lunar equator 52 nicknamed Xena 52 Enceladus 52 WFC3 52 interstellar dust 52 spacecraft orbiting 52 Mars rovers Spirit 52 dimming starlight 52 Quadrantids 52 NASA Great Observatories 52 Tunguska asteroid 52 Martian rovers 52 HiRISE camera aboard 52 Io Europa Ganymede 52 Yinghuo 1 52 orbiting Mars 52 lunar perigee 52 habitable zones 52 moons Io Europa Ganymede 52 transiting exoplanet 52 retrograde orbits 52 planetoid 52 galaxy cluster 52 Jupiter Ganymede 52 radial velocity 52 spacecraft Cassini 52 Sedna 52 Messenger spacecraft 52 celestial bodies 52 Tarantula Nebula 52 Compact Reconnaissance Imaging Spectrometer 52 comets 52 planet HD #b 52 Infrared Thermal Imaging Spectrometer 52 gravitationally bound 52 Jupiter icy moons 52 Ulysses spacecraft 52 Jupiter Uranus 52 Pan STARRS 52 orbiting observatories 52 Spaceguard Survey 52 planets comets 52 polar craters 52 OMEGA instrument 52 periodic dimming 52 P Churyumov Gerasimenko 52 Jupiter Saturn 52 Phoebe orbits 52 twin rover Spirit 52 Palomar Observatory 52 orbited Jupiter 52 Nasa Kepler 52 SIM PlanetQuest 52 interstellar dust grains 52 filamentary structure 52 Hubble observations 52 chromosphere 52 asteroid Lutetia 52 WISE spacecraft 52 Keck telescope 52 Deep Impact flyby spacecraft 52 moon Europa 51 Jupiter moons 51 CoRoT 9b 51 gamma ray burst 51 celestial objects 51 galaxy M# [002] 51 exosphere 51 Herschel telescope 51 Cepheid variables 51 moons orbiting Pluto 51 Martian crater 51 HiRISE images 51 Geminids 51 robotic rovers 51 spiral galaxy Messier 51 Arches Cluster 51 celestial object 51 BepiColombo 51 extragalactic 51 spatially resolved 51 circumstellar disk 51 Opportunity rover 51 HARPS spectrograph attached 51 irregularly shaped asteroid 51 interstellar dust particles 51 neutral mass spectrometer 51 radial velocity technique 51 imaging spectrometer 51 mineral olivine 51 Cosmic Microwave Background 51 PSR J# 51 rover Opportunity 51 Comet Churyumov Gerasimenko 51 inch Samuel Oschin 51 red supergiant 51 elliptical galaxies 51 Cassini Huygens spacecraft 51 SN #D 51 outermost planets 51 orbiting spacecraft 51 retrograde orbit 51 eclipsing binary 51 STEREO mission 51 Saturn moon Mimas 51 lunar crust 51 NASA twin rovers 51 solar corona 51 planet TrES 51 Endurance crater 51 Wilkinson Microwave Anisotropy Probe 51 eccentric orbits 51 star Fomalhaut 51 Kuiper Belt 51 ecliptic 51 ESO VLT 51 Valles Marineris 51 NASA MErcury Surface 51 Saturn Enceladus 51 Composite Infrared Spectrometer 51 planets moons 51 Gravitational waves 51 G#.# +#.# 51 SN #gy 51 constellation Carina 51 moonlet 51 spectrographs 51 VY Canis Majoris 51 planetary nebulas 51 spiral galaxy NGC 51 exoplanet orbiting 51 proto cluster 51 Imaging Spectroradiometer MODIS instrument 51 terrestrial planets 51 planet magnetosphere 51 globular star 51 Philae lander 51 EPOCh 51 circumstellar 51 astrophysical objects 51 HD# [002] 51 Mauna Kea Hawaii 51 binary quasar 51 LCROSS spacecraft 51 NEOWISE 51 Rosetta lander 51 distant quasar 51 Descent Imager Spectral Radiometer 51 Stardust spacecraft 51 astronomical telescope 51 constellations Cygnus 51 habitable planets 51 diffuse aurora 51 Mercury Uranus 51 optical wavelengths 51 electron ion 51 constellation Cassiopeia 51 orbiting telescope 51 S/# S1 51 distant galaxy clusters 51 Cerro Paranal 51 Trojan asteroids 51 Voyager spacecraft 51 Mars Pathfinder lander 51 extrasolar worlds 51 Relations Observatory STEREO 51 elliptical orbits 51 NASA Kepler 51 comets asteroids 51 undersea volcanoes 51 PASADENA Calif. Astronomers 51 amateur astronomers peering 51 Muchachos Observatory 51 exosolar planets 51 photosphere 51 Keck telescopes 51 Saturn moons Enceladus 51 Mars moon Phobos 51 infrared spectrometer 51 constellation Sagittarius 51 orbiter Cassini 51 Gliese #G 51 circumstellar disks 51 S/# P2 51 noctilucent clouds 51 aurorae 51 planets asteroids 51 gravitational lenses 51 Context Camera 50 retroreflector 50 Venusian surface 50 Diviner 50 interacting galaxies 50 constellation Taurus 50 X ray emission 50 galaxy NGC 50 magnetars 50 particle analyzers 50 Helix nebula 50 infrared spectra 50 XO 3b 50 Earth magnetosphere 50 ESA Rosetta 50 distant galaxy 50 NuSTAR 50 magnetotail 50 Europa Orbiter 50 constellation Eridanus 50 HIRES spectrometer 50 Optical Gravitational Lensing Experiment 50 plutoid 50 Convection Rotation 50 Reconnaissance Orbiter 50 lunar orbits 50 zodiac constellations 50 Comet Hale Bopp 50 ray Space Telescope 50 NASA Interstellar Boundary 50 NASA ESA Hubble 50 comet Hartley 2 50 planets Kepler 50 Area Telescope LAT 50 DISR 50 rovers Spirit 50 constellation Cygnus 50 Gerard Kuiper 50 galactic mergers 50 hot Jupiters 50 Mars CRISM 50 NASA Far Ultraviolet 50 lobate scarps 50 STEREO spacecraft 50 AB Aurigae 50 AGNs 50 neutron spectrometer 50 CoRoT 50 Spitzer infrared 50 constellation Centaurus 50 Solar Orbiter 50 Ontario Lacus 50 magnetosphere 50 smallest exoplanets 50 spookfish 50 Nasa spacecraft 50 Interior Laboratory GRAIL 50 telescopic camera 50 Pleiades cluster 50 Space Environment Geochemistry 50 Milky Way halo 50 Nasa Mars Reconnaissance 50 globular cluster 50 frozen sunless 50 infrared wavelengths 50 Comet NEAT 50 asteroid Itokawa 50 Terrestrial Planet Finder 50 Neutron Spectrometer 50 Heliospheric Observatory SOHO 50 interstellar cloud 50 Comet McNaught 50 Martian surface 50 Halley comet 50 Caloris basin 50 Solar System 50 faint smudge 50 habitable worlds 50 particle detectors 50 planetary transits 50 supervolcanoes 50 Exoplanets 50 Kepler Space Telescope 50 planet transits 50 Iapetus Saturn 50 visit http:/saturn.jpl.nasa.gov 50 Quadrantid meteor shower 50 UKIRT 50 constellation Auriga 50 brown dwarfs 50 red supergiants 50 HAT P 50 HD #b [001] 50 globular clusters 50 active volcanism 50 Triangulum Galaxy 50 star Beta Pictoris 50 NFIRE satellite 50 Anisotropy Probe 50 lander rover 50 Hubble Space Telescope HST 50 Kepler spacecraft 50 BLG #L 50 SINFONI 50 elongated orbit 50 planets atmospheres 50 Saturn magnetosphere 50 aphelion 50 Gamma ray bursts 50 Exoplanet 50 Caloris 50 brown dwarfs stellar 50 heliosphere 50 galaxies collide 50 spectroscopically 50 giant gaseous planets 50 orbiting observatory 50 X ray binary 50 ESO Very Large Telescope 50 Climate Experiment GRACE 50 Great Observatories 50 constellation Aquarius 50 shadowy craters 50 Kepler Mission 50 intrinsic brightness 50 spacecraft 50 crescent Moon 50 constellation Cetus 50 twin rovers Spirit 50 brightest comet 50 comet Hale Bopp 50 luminous galaxies 50 NEAs 50 brightest supernova 50 Coma Cluster 50 WMAP satellite 50 orbital inclination 50 carbonaceous chondrite 50 interplanetary spacecraft 50 planet Gliese #c 50 orbits Saturn 50 hydroxyl molecules 50 planet HD#b 50 Jupiter flyby 50 zodiacal light 49 star Spica 49 Cassini Equinox 49 Viking Orbiter 49 constellation Ara 49 Saturn moon Enceladus 49 Iapetus 49 Venus Neptune Uranus 49 Space Infrared Telescope 49 journal Meteoritics 49 shepherding spacecraft 49 Eagle Nebula 49 optical interferometry 49 infrared mapping spectrometer 49 Enceladus flybys 49 ESO Paranal Observatory 49 Planck telescope 49 quasars 49 sunspot cluster 49 optical telescope 49 supergiant star 49 planetary astronomy 49 sodium atoms 49 Anisotropy Probe WMAP 49 Jonathan Lunine 49 icy comets 49 planets circling stars 49 Hubble Ultra 49 Ionosphere Sounding 49 rotational axis 49 Saturn outermost 49 Moderate Resolution Imaging 49 orbital resonance 49 neutrino telescope 49 substorm 49 Martian rocks 49 NASA Wilkinson Microwave 49 foreground galaxy 49 muon neutrino 49 Mars Jupiter Uranus 49 Cassini flybys 49 HARPS instrument 49 impactors 49 galaxy clusters 49 Hubble telescope 49 meteoroids 49 gravitational interactions 49 Proxima Centauri 49 impactor 49 magnetospheric 49 permanently shadowed regions 49 NASA Voyager spacecraft 49 Solar Dynamics Observatory 49 constellation Scorpius 49 ROSAT 49 cryosphere 49 constellation Andromeda 49 LRO spacecraft 49 Red Rectangle 49 waning crescent Moon 49 E ELT 49 astrometry 49 waxing crescent moon 49 aperture telescope 49 moon Mimas 49 supergiant stars 49 comet Wild 49 hypervelocity stars 49 hydrothermal vent 49 Mercury magnetosphere 49 comet particles 49 accretion disk 49 UDFy # 49 pulsar 49 Thermal Emission Spectrometer 49 Neutron stars 49 ESA XMM Newton 49 Kraken Mare 49 Spitzer infrared spectrograph 49 ejecta blanket 49 millisecond pulsars 49 asteroids Ceres 49 dust mote 49 Valles Marineris canyon 49 GRB #A 49 VLTI 49 proto planetary disks 49 reflection nebula 49 protons collide 49 visible wavelengths 49 Goldilocks planet 49 hexagonal mirrors 49 exoplanet hunter 49 HIP #b 49 SDSS telescope 49 perihelion 49 telescopes 49 SELENE 49 galactic cosmic rays 49 asterism 49 distant galaxies 49 permanently shadowed craters 49 accretion disks 49 Hawaii van Dokkum 49 Beta Pictoris 49 X ray telescope 49 Global Surveyor spacecraft 49 ULIRGs 49 Space ENvironment GEochemistry 49 highly elliptical orbit 49 substorms 49 Fomalhaut 49 brightnesses 49 nebular 49 prograde 49 interstellar particles 49 active galactic nuclei 49 potentially habitable planets 49 globulars 49 mineralogical composition 49 fainter 49 magnetar 49 Martian arctic plains 49 orbiting Cassini spacecraft 49 Characterization EPOCh 49 Spectroscopic Explorer 49 ultraviolet imaging spectrograph 49 galaxies 49 Keck Interferometer 49 GEochemistry 49 astronomical phenomena 49 MARSIS 49 UB# [003] 49 Super Earths 49 Comet Encke 49 Butterfly Nebula 49 Mini TES 49 infrared spectrometers 49 LROC 49 Phobos 49 Ranging MESSENGER spacecraft 49 Dwarf Planet 49 SeaWiFS 49 Herschel Space 49 Saturn outermost ring 49 interstellar dust samples 49 comet Tempel Tuttle 49 Arecibo radar 49 gravitational lens 49 protoplanetary disks 49 ultraviolet wavelengths 49 galactic bulge 49 Aram Chaos 49 Epoxi 49 GA6 49 tidally locked 49 Adam Riess 49 Comet 9P/Tempel 1 49 Voorwerp 49 gradiometer 49 Crab Nebula 49 rover Sojourner 49 Perseus Cluster 49 microscopic imager 49 habitable planet 49 thin crescent moon 49 IRAS #-# 49 Lutetia 48 gibbous 48 Horizons spacecraft 48 High Resolution Imaging 48 Pleiades star 48 Mars Odyssey spacecraft 48 eclipsing binaries 48 antiparticle 48 LCROSS mission 48 Aurigid 48 Telescope LSST 48 comets meteors 48 Landsat satellite 48 asteroid belt 48 OSIRIS REx 48 Cosmonaut Yuri Gagarin 48 Mimas 48 Saturnian 48 smallest extrasolar planet 48 Lander robotic arm 48 NASA Stardust spacecraft 48 polar vortex 48 Jupiter moons Europa 48 ESO telescopes 48 asteroidal 48 Martian volcanoes 48 BP Piscium 48 GRB #B 48 Uranus Jupiter 48 Uranus 48 type Ia supernovae 48 comet dust 48 closest flyby 48 LADEE 48 dust devils 48 NASA MESSENGER 48 starburst galaxy 48 Lunar Reconnaissance Orbiter 48 orbiting Kepler telescope 48 sun corona 48 NASA twin STEREO 48 outermost planet 48 planet gravitational tug 48 Atlantis undocks 48 comet chaser Rosetta 48 HiRISE 48 NASA Cosmic Background 48 Eta Aquarid meteor shower 48 comet flyby 48 Grillmair 48 Earth asteroid Itokawa 48 Geminid meteors 48 nebulae 48 earthlike 48 mineralogical mapping 48 Huygens mission 48 Fermi Gamma ray 48 TW Hydrae 48 planets astronomers 48 VLBA observations 48 Mars Orbiter Camera 48 constellation Perseus 48 asteroids WISE 48 twin Voyager spacecraft 48 Earth asteroids 48 Rosette Nebula 48 Chilean Atacama Desert 48 Olive ridleys 48 robotic spacecraft 48 comet chaser 48 Discovery undocks 48 waning gibbous 48 discover Fomalhaut 48 Saturn Uranus Neptune 48 Venus Uranus 48 Trifid Nebula 48 orbiting telescopes 48 Mars Reconnaissance Orbiter MRO 48 Triangulum 48 planetoids 48 Saturn equinox 48 Deep Impact Extended 48 thin crescent 48 Tempel 1 48 SN #A 48 axial tilt 48 Gusev crater 48 Chandra Observatory 48 Moon Mineralogy Mapper M3 48 galaxy 48 ESA ASI 48 constellation Leo 48 GLAST telescope 48 durable twin rovers 48 Kailash Sahu 48 inner moons 48 LCROSS 48 X ray observatories 48 equatorial plains 48 MErcury Surface Space ENvironment 48 polar regions 48 Tarantula nebula 48 CALIPSO 48 particle detector 48 panoramic camera 48 astrobiologists 48 Venusian 48 Cassini radar 48 Itokawa 48 Victoria Crater 48 Hubble Space Telescope 48 XMM Newton X ray 48 spectroscopic measurements 48 MESSENGER MErcury Surface 48 OGLE TR 48 protostars 48 zodiacal dust 48 cosmic microwave radiation 48 Candor Chasma 48 Diviner instrument 48 IceCube 48 NASA Chandra 48 Scheila 48 Observatory SDO 48 Globular clusters 48 protoplanets 48 ejecta 48 Halton Arp 48 telescope 48 Helix Nebula 48 supernovae explode 48 planetary missions 48 Earth orbiting satellites 48 Mastcam 48 orbiter Mars Odyssey 48 blazars 48 Cabeus crater 48 Small Magellanic Cloud 48 Express orbiter 48 hyper spectral 48 Ultraviolet Imaging Spectrograph UVIS 48 penetrating radar 48 CU Boulder LASP 48 Pluto moon Charon 48 super perigee moon 48 AKARI 48 Martian dust 48 Very Large Telescope 48 Jupiter magnetosphere 48 Earthshine 48 Haumea 48 baryon 48 Eta Carinae 48 cosmic phenomena 48 heliospheric 48 yardangs 48 Saturn Uranus 48 meteoroid 48 Landsat satellites 48 thrilling stargazers 48 tholins 48 Lyrids 48 interstellar grains