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(Click for frequent words.) 69 constellation Carina 68 Coma Cluster 67 Virgo Cluster 66 MG J# +# 65 constellation Hercules 65 Fermi telescope 65 interstellar cloud 65 exo planets 65 planets comets 64 planets constellations 64 Samuel Oschin Telescope 64 circumstellar disks 64 constellation Vulpecula 64 Upsilon Andromedae b 64 Geminga 63 exoplanets planets 63 constellation Eridanus 63 constellation Centaurus 63 protoplanetary 63 Epsilon Eridani 63 planets orbiting stars 63 Coma cluster 63 Fornax cluster 62 sunlike stars 62 permanently shadowed craters 62 Cygnus Lyra region 62 Anthony Remijan 62 whiz harmlessly 62 planets orbiting distant 62 moon Io 62 Valles Marineris canyon 62 barred spiral galaxy 61 galaxy M# [002] 61 Upsilon Andromedae 61 Stephan Quintet 61 volcanic moon Io 61 planets moons 61 galaxy M# [001] 61 van Arkel discovery 61 Beta Pictoris 61 sized planets orbiting 61 Syrtis Major 61 moons orbiting 61 dust enshrouded 61 Rosette Nebula 61 Jupiter moon Io 61 protoplanetary disks 61 Neptune Uranus 60 extrasolar 60 planet HD #b 60 constellation Andromeda 60 planet Gliese #g 60 Virgo cluster 60 constellation Aquarius 60 spiral galaxy NGC 60 gamma ray observatory 60 lunar equator 60 Eagle Nebula 60 coronal loops 60 Milky Way halo 60 AU Mic 60 distant quasars 60 constellation Scorpius 60 Kuiper belt objects 60 star Beta Pictoris 60 planets asteroids 60 exoplanets orbiting 60 constellation Coma Berenices 60 earthlike planets 60 comets orbiting 59 Beta Pictoris b 59 galaxy NGC 59 ray Space Telescope 59 Exoplanets 59 constellation Ursa Major 59 amateur astronomers peering 59 cosmological distances 59 extrasolar planets orbiting 59 nebular 59 Saturn Enceladus 59 constellation Sagittarius 59 Pan STARRS PS1 telescope 59 mu Arae 59 lunar craters 59 Carina Nebula 59 Galactic cosmic rays 59 active galactic nucleus 59 HD#b 59 Orion nebula 59 starburst galaxy 59 merging galaxies 59 jovian 59 Saturn Cassini 59 constellation Hydra 59 Neutron stars 59 constellation Virgo 59 Bug Nebula 59 star Fomalhaut 59 protoplanetary discs 59 exoplanetary 58 active galactic nuclei 58 stellar nurseries 58 Trifid 58 VY Canis Majoris 58 GALEX 58 Saturnian system 58 spherical halo 58 planetary Transits 58 Terra Meridiani 58 planets orbiting sun 58 interstellar dust clouds 58 Lagoon Nebula 58 HD# [002] 58 RRATs 58 BLG #Lb 58 Arsia Mons 58 Fomalhaut b 58 supergiant star 58 Terra Sirenum 58 PSR B# +# 58 inhabitable planets 58 constellation Cetus 58 Omega Centauri 58 planets circling stars 58 dimming starlight 58 cluster NGC 58 Chajnantor plateau 58 Tharsis Rise 58 comets meteors 58 Dumbbell Nebula 58 moon Mimas 58 lensing galaxy 58 fainter objects 58 Galilean moons 58 X ray emitting 58 Oort cloud 58 Earthlike planets 58 COROT 7b 58 exo planet 58 Eridanus 58 giant elliptical galaxy 58 supermassive 58 distant galaxy 58 Bok globules 57 Cerro Paranal 57 millisecond pulsar 57 Submillimeter Array 57 distant suns 57 shadowy craters 57 Triangulum Galaxy 57 assumed planets circling 57 highly elliptical orbits 57 Pleiades cluster 57 planetary nebulae 57 accretion disks 57 innermost planet 57 TrES 4 57 foreground galaxy 57 Saturn moons 57 constellation Fornax 57 gaseous planet 57 Magnetars 57 Ring Nebula 57 ecliptic plane 57 Oort Cloud 57 cosmic cannibal 57 Cat Paw Nebula 57 IRC +# 57 Uranus Jupiter 57 icy moons 57 Candor Chasma 57 Martian craters 57 Saturnian moons 57 globulars 57 Gravitational waves 57 circumstellar disk 57 NGC #A 57 detect gamma rays 57 masers 57 photosphere 57 Convection Rotation 57 spectroscopic measurements 57 Cancri 57 Earthlike planet 57 constellation Pisces 57 underwater volcanoes 57 Saturn magnetosphere 57 Cancri e 57 Veil Nebula 57 absorbs photons 57 Small Magellanic Cloud 57 thrilling stargazers 57 planetary surfaces 57 gaseous planets 57 Crab Pulsar 56 Comet 9P/Tempel 1 56 inner asteroid belt 56 elliptical galaxy NGC 56 Cerro Pachon 56 X ray binary 56 planemos 56 Kepler 9c 56 spiral galaxy Messier 56 Comet Hartley 56 occultations 56 Chilean Atacama Desert 56 icy moon Enceladus 56 constellation Auriga 56 asteroids comets 56 radial velocity technique 56 elliptical galaxy 56 constellation Puppis 56 comets asteroids 56 Chajnantor 56 moons circling 56 comets moons 56 constellations Cygnus 56 gravitationally bound 56 distant galaxies 56 GJ#b 56 intrinsic brightness 56 southern constellation Carina 56 Olympus Mons 56 dwarf spheroidal 56 Planetary Transits 56 galactic disk 56 infall 56 Exoplanet 56 detect neutrinos 56 Corot 9b 56 Mauna Kea Hawaii 56 Io Europa 56 supernovae explode 56 permanently shadowed 56 Orion Nebula 56 airglow 56 extrasolar planetary systems 56 Helix Nebula 56 spinning neutron stars 56 proplyds 56 Kuiper belt 56 RS Ophiuchi 56 Manchester Jodrell Bank 56 Galaxy Evolution 56 Carina constellation 56 occulted 56 P/# A2 56 Canes Venatici 56 sunlike star 56 PKS #-# 56 Supernova #A 56 Evolution Explorer 56 UCO Lick 56 brightest supernova 56 Asteroid Belt 56 Seyfert galaxies 56 nebulae 56 interstellar clouds 56 periodic dimming 56 stellar occultations 56 Peter Eisenhardt 56 cinder cones 56 constellation Libra 56 Elenin 55 Trojan asteroids 55 Wolf Rayet stars 55 EPOXI spacecraft 55 constellation Cepheus 55 GJ #b [001] 55 aurorae 55 planetary nebulas 55 Tarantula Nebula 55 WISE spacecraft 55 Manned missions 55 constellation Lacerta 55 TNOs 55 OGLE TR #b 55 asteroids orbiting 55 IRAS #-# 55 galactic nuclei 55 Andromeda galaxy 55 X ray telescopes 55 submillimetre 55 Nasa Kepler 55 circumstellar 55 Kuiper Belt Objects 55 Beehive Cluster 55 retrograde orbits 55 Milky Way galaxy 55 Comet Hartley 2 55 Trapezium 55 Comet Tempel Tuttle 55 interstellar particles 55 Comet Holmes 55 twin Voyager spacecraft 55 CoRoT 9b 55 Heliospheric Observatory SOHO 55 permanently shadowed regions 55 elongated orbits 55 protons collide 55 Relations Observatory STEREO 55 extragalactic 55 comet Tempel Tuttle 55 astronomical objects 55 Comet #P 55 Suzaku X ray 55 Infrared Astronomical Satellite IRAS 55 AGNs 55 HARPS spectrograph attached 55 Gliese #G 55 Gliese #e 55 astrophysical objects 55 Red Rectangle 55 spacecraft orbited 55 CoRoT satellite 55 emit X rays 55 Saturnian moon 55 distant supernovas 55 WISE telescope 55 Corot 7b 55 TSN PZ camera 55 Galilean satellites 55 evaporite deposits 55 distant supernovae 55 zodiac constellations 55 Solar TErrestrial RElations Observatory 55 Infrared Mapping Spectrometer 55 gravitational microlensing 55 ESO VLT 55 gravitationally lensed 55 planetary embryos 55 Cosmic Microwave Background 55 subsurface ocean 55 imaging spectrometer 55 supernova remnant 55 IRAS 4B 55 rotating neutron stars 55 astrophysical phenomena 55 X ray wavelengths 55 galaxies quasars 55 energetic electrons 55 faraway planets 55 ESA XMM Newton 55 Tarantula nebula 55 coronal mass ejections CMEs 55 Milky Way Galaxy 55 transiting exoplanet 55 Pluto Charon 55 AB Aurigae 55 Cometary 55 dusty disks 55 galaxy cluster 55 comet Churyumov Gerasimenko 55 constellation Taurus 55 galaxies 55 protoplanetary disk 55 distant quasar 55 retrograde orbit 55 Spitzer Space Telescopes 55 Polycyclic aromatic hydrocarbons 55 Earthlike 55 Bonnie Buratti 55 lobate scarps 55 galactic halo 55 Cosmic rays 55 red supergiants 54 Venus Neptune Uranus 54 spiral galaxy M# 54 constellation Ara 54 Laser Interferometer Gravitational Wave 54 Hellas Basin 54 blazars 54 Palaeozoic sedimentary 54 galaxy 54 THEMIS Image 54 galactic mergers 54 star Spica 54 Gamma ray burst 54 solar corona 54 inch refractor telescope 54 solar radii 54 moons orbiting Saturn 54 Martian volcanoes 54 Andromeda Galaxy M# 54 Katzman Automatic 54 Sagittarius dwarf galaxy 54 galactic bulge 54 ESA Integral 54 outer corona 54 transiting planets 54 lunar crust 54 visit http:/saturn.jpl.nasa.gov 54 blue supergiant 54 Saharan Desert 54 transiting exoplanets 54 GJ #b [002] 54 Hot Jupiters 54 supersonic plumes 54 protostars 54 Charles Beichman 54 CoRoT #b 54 supernova remnants 54 Zeta Ophiuchi 54 Sagittarius B2 54 Comet Encke 54 interstellar dust 54 smallest exoplanet 54 celestial sphere 54 galaxies nebulae 54 Active Galactic Nuclei 54 Perseus constellation 54 Keck Interferometer 54 undersea volcanoes 54 called gravitational microlensing 54 NASA CloudSat 54 moon Ganymede 54 distant galaxy clusters 54 solar prominences 54 auroral displays 54 Muchachos Observatory 54 tholins 54 filamentary structures 54 Shackleton Crater 54 Globular clusters 54 Venusian surface 54 Ius Chasma 54 Henize #-# 54 HIP #b 54 lunar orbiters 54 dimensional atlas 54 Dwarf galaxies 54 diffuse aurora 54 red supergiant 54 galaxy NGC# 54 ESO PR 54 Oceanus Procellarum 54 trans Neptunian objects 54 mineral olivine 54 Lava flows 54 fissure eruption 54 lava tubes 54 chemical abundances 54 starburst galaxies 54 colliding galaxies 54 Mount Bosavi 54 constellation Aquila 54 Comet NEAT 54 ESA Planck 54 orbited Jupiter 54 collisional 54 CMB radiation 54 Trifid Nebula 54 Mars moon Phobos 54 smallest exoplanets 54 Pleiades star 54 hydrothermal vent 54 Valles Marineris 54 Astronomical Units 54 hematite mineral 54 X ray observatories 54 zap boulders 54 gravitational tides 54 SDSS II 54 protostar 54 Infrared Pathfinder Satellite 54 Cassini Finds 54 double helix nebula 54 Orion constellation 54 GLAST telescope 54 faint smudge 54 Kuiper belt object 54 afterglows 54 BLG #L 54 SN #A 53 filamentary structure 53 planets Uranus 53 brightest comet 53 Deep Impact eXtended Investigation 53 Arabia Terra 53 habitable worlds 53 Corona Australis 53 mesosphere 53 SNR #-#.# 53 cosmic phenomena 53 coronal holes 53 Charon Pluto 53 planets circling 53 Antennae Galaxies 53 abyssal plain 53 Planitia 53 discover Fomalhaut 53 Nikku Madhusudhan 53 constellation Monoceros 53 interstellar dust particles 53 rocky extrasolar planet 53 electrons protons 53 G#.# +#.# 53 Ontario Lacus 53 Zacaton 53 elliptical orbits 53 Explorer GALEX 53 star Proxima Centauri 53 icy comets 53 gamma rays emitted 53 Descent Imager Spectral Radiometer 53 Caloris 53 Great Orion Nebula 53 Libra constellation Vogt 53 volcanic lava flows 53 orbiting Chandra 53 moons Phobos 53 Fermi Gamma ray 53 Kraken Mare 53 moonlets 53 Hanny Voorwerp 53 magnetospheric 53 http:/www.nasa.gov/cassini 53 gravitational interaction 53 TW Hydrae 53 ESA Herschel 53 planet Gliese #c 53 Hunga Tonga 53 constellation Gemini 53 Lick Observatory 53 celestial object 53 Uranus Neptune 53 Martian polar 53 Saturn outermost 53 Cerro Tololo 53 Michael Studinger 53 Type Ia supernovas 53 WM Keck Observatory 53 Omega Nebula 53 redshifted 53 Magellanic Clouds 53 Voyager Galileo 53 constellations planets 53 magnetospheres 53 galactic cosmic rays 53 silicon monoxide 53 habitable planets hints 53 planets orbits 53 aboard ESA Envisat 53 relativistic particles 53 Comet Halley 53 globular cluster M# 53 outermost planets 53 proto cluster 53 ejecta blanket 53 giant elliptical galaxies 53 planetary atmospheres 53 Astronomers Find 53 Spectrograph 53 eclipsing binary 53 galactic clusters 53 Horsehead Nebula 53 luminous galaxies 53 proto galaxies 53 gamma ray emitting 53 Bramley Murton 53 Anisotropy Probe WMAP 53 HESS telescopes 53 thin crescent 53 SN #D 53 IBEX spacecraft 53 Shri Kulkarni 53 UDFy # 53 cratered highlands 53 HII regions 53 submillimeter wavelength 53 lunar poles 53 constellation Pegasus 53 planet Uranus 53 Dan Buhl Planetarium 53 Interferometer VLTI 53 HUDF 53 asteroseismology 53 VIRTIS instrument 53 atop Mauna Kea 53 quasars 53 Neptune Jupiter 53 nebulas 53 protoplanets 53 star clusters nebulae 53 NASA THEMIS 53 spacecraft flyby 53 eccentric orbits 53 Halemaumau 53 submillimeter 53 ionized gases 53 submarine volcanoes 53 polar mesospheric clouds 53 smoothest flattest 53 Saturn moons Enceladus 53 located atop Mauna 53 nebula NGC 53 Mini Thermal Emission 53 Circinus 53 orbiting observatories 53 La Silla Observatory 53 Triangulum 53 amateur skywatchers 53 NASA rovers Spirit 53 antineutrinos 53 meteor craters 53 submillimetre wavelengths 53 constellation Cassiopeia 53 Keck Telescope 53 Follett Pillars 53 binary quasar 53 habitable planets 53 Phoebe orbits 53 SMBH 53 radioactive nuclei 52 moon Enceladus 52 Mars Uranus 52 hexagonal mirrors 52 Shiveluch 52 Jupiter Saturn 52 prominences 52 mysterious uncharted 52 Diviner instrument 52 Auger Observatory 52 Harvard Smithsonian Astrophysical 52 gamma ray flares 52 Venusian atmosphere 52 Astrological lore 52 renowned astrophysics observatory 52 N. Rathnasree 52 Wide Angle Search 52 inch Samuel Oschin 52 submillimeter galaxies 52 heliospheric 52 Herschel Space 52 galaxy clusters 52 Saturnian 52 volcanically active 52 largest moon Charon 52 Earth asteroids NEAs 52 geospace 52 X rays gamma rays 52 habitable zones 52 Epsilon Aurigae 52 Thermal Emission Spectrometer 52 NASA Far Ultraviolet 52 THEMIS satellites 52 Supermassive black 52 orbits Saturn 52 HIRES spectrometer 52 Hubble orbits 52 Mars Uranus Neptune 52 Coma Berenices 52 transiting planet 52 circumstellar dust 52 exoplanet orbiting 52 planetary nebula 52 Arches Cluster 52 dense clumps 52 Shackleton crater 52 Wassonite 52 Nasa Mars Reconnaissance 52 #P/Churyumov-Gerasimenko 52 Ultraviolet Imaging Spectrograph UVIS 52 Cloud Aerosol Lidar 52 ionized hydrogen 52 VB #b 52 Gamma ray bursts 52 noctilucent clouds 52 exosolar planets 52 HD #b [002] 52 accretion disk 52 Earthly contamination 52 X ray binaries 52 stellar occultation 52 NASA Cassini 52 densest cluster 52 Roque de los 52 inner Oort Cloud 52 exoplanets planets outside 52 Spitzer infrared 52 galactic equator 52 Chamberlin Observatory 52 Great Observatories Origins 52 Earths orbiting 52 phyllosilicate 52 magnetars 52 intracluster 52 relativistic jets 52 Greenbelt Md. manages 52 constellation Serpens 52 CDMS experiment 52 shadowed craters 52 Serpens 52 Cepheid variables 52 WASP #b 52 NASA Fermi Gamma 52 Ian McShane Pillars 52 Large Magellanic Cloud 52 Voyager probes 52 Hawaii Mauna Kea 52 SN #gy 52 Perseid meteor showers 52 Microlensing 52 active volcanism 52 Earth magnetosphere 52 mineralogical composition 52 Serpens Cauda 52 SEGUE 52 supernova explosions 52 constellation Bootes 52 Pavonis Mons 52 planets 52 laser altimeter 52 protoplanetary disc 52 chromosphere 52 Bonneville Crater 52 exosphere 52 lava flowed 52 Explorer WISE 52 constellation Canis Major 52 thermal vents 52 infalling gas 52 Gamma ray 52 galaxy formation 52 outer planets 52 VLTI 52 moon Phobos 52 Comet Hale Bopp 52 Neutron Detector 52 Heliospheric Observatory 52 Mercury magnetosphere 52 Mpc 52 Wilkinson Microwave Probe 52 Cassini flyby 52 Butterfly Nebula 52 twin rovers Spirit 52 interacting galaxies 52 phyllosilicates 52 orbiting Kepler telescope 52 Spectroscopic Explorer 52 VHE gamma rays 52 NASA Wilkinson Microwave 52 celestial objects 52 Fashion Movie Reviews 52 Andromeda Galaxy 52 Anisotropy Probe 52 infrared telescopes 52 Proxima Centauri 52 galaxies collide 52 ionise 52 VISTA telescope 52 KBOs 52 Cassini Huygens Mission 52 hydrated minerals 52 gravitational perturbations 52 Jovian moons 52 polar craters 52 X ray Observatory 52 Capricornus 52 planets astronomers 52 orbiting gamma ray 52 buckypaper virtually 52 Jupiter Ganymede 52 polar stratospheric 52 Saturn moon Enceladus 52 optical telescopes 52 oppositely directed 52 solar nebula 52 supergiant stars 52 HiRISE image 52 cosmic particles 52 Delta Cephei 52 meteoritic material 52 spinning neutron 52 Kuiper Belt object 52 magnetotail 52 Crab Nebula 51 Jennifer Rizzotti Sue 51 Nikon D# Kowa 51 terrestrial planets 51 Grímsvötn volcano 51 Very Large Array 51 eclipsing binaries 51 rocky planets 51 planets orbiting 51 spectral fingerprint 51 telescopes atop Mauna 51 polarimetry 51 prograde 51 Gliese #c 51 star Gliese 51 constellation Canes Venatici 51 X ray emission 51 supersymmetric particles 51 southern supercontinent 51 heavily cratered 51 interstellar dust grains 51 Diviner 51 PSR J# 51 infalling 51 Amateur astronomers 51 RX J# 51 Mars Saturn Uranus 51 Jupiter Uranus 51 carbonaceous chondrites 51 Wilkinson Microwave Anisotropy Probe 51 Lengai 51 Aram Chaos 51 nebula 51 J# +# [002] 51 Keck telescopes 51 Cosmic Evolution 51 Mandushev 51 constellation Lyra 51 novas 51 giant gaseous planets 51 asteroids WISE 51 silicate dust 51 Andromeda halo 51 eyepiece #/#s f/#.# 51 Boar Tusk 51 La Silla observatory 51 hydroxyl molecules 51 faraway galaxies 51 seabed sediments 51 infrared spectrometers 51 orbit GEO 51 Hellas Planitia 51 accreting 51 constellation Ophiuchus 51 Planck telescope 51 Opportunity Mars rover 51 planet magnetosphere 51 potentially habitable 51 smoggy atmosphere 51 Cassini spacecraft orbiting 51 comet nuclei 51 hypervelocity stars 51 submillimeter wavelengths 51 Ulysses spacecraft 51 Dust devils 51 extraterrestrial civilizations 51 NASA Kepler telescope 51 Ringed Planet 51 globular clusters 51 Depth SAFOD 51 Caloris Basin 51 exoplanet 51 volcanic vents 51 Martian rovers 51 Methone 51 Geminid shower 51 Saturnian moon Titan 51 proto planetary disks 51 Saturn icy moons 51 SN #C 51 Neptune Uranus Jupiter 51 http:/saturn.jpl.nasa.gov 51 past boninite lavas 51 Navajo Sandstone 51 GQ Lupi 51 X ray afterglow 51 Earth ionosphere 51 gypsum crystals 51 tidal bulge 51 faint galaxies 51 Quadrantids 51 Galileo spacecraft 51 northern arctic plains 51 dwarf galaxies 51 ESO Paranal Observatory 51 binary asteroids 51 Buehler Planetarium 51 GRB #B 51 Solar Dynamics Observatory 51 plutoids 51 Astrophysical 51 penetrating radar 51 dwarf spheroidal galaxies 51 orbiting Cassini spacecraft 51 TrES 51 NASA Solar Terrestrial 51 Lake Untersee 51 geomicrobiology studying particles 51 Herbig Ae Be 51 Toutatis 51 elliptical galaxies 51 protoplanet 51 X ray observatory 51 zodiacal dust 51 seafloor methane 51 Higgs bosons 51 particle detectors 51 Cerro Pachón 51 ringed planet 51 retroreflector 51 microbialites 51 spiral nebulae 51 Thick smoke obscured 51 detect gravitational waves 51 McMurdo Dry Valleys 51 KOCH PLANETARIUM Evansville 51 gamma ray emission 51 gamma ray flashes 51 astrophysical 51 telescope atop Mauna 51 Kuiper belt disc 51 orbiting Saturn 51 Michael Zolensky 51 rotating neutron 51 comet Lulin 51 Strasenburgh Planetarium 51 Extrasolar 51 explosive volcanism 51 XMM Newton X ray 51 interferometric 51 hyper spectral 51 geologically active 51 unmanned probes 51 Gusev crater 51 Fermi Telescope 51 HiRISE camera 51 Globular Cluster 51 sunspot cluster 51 SMBHs 51 Orcus Patera 51 Quadrantid meteor shower 51 emission nebula 51 ionised gas 51 Daisetta sits 51 interplanetary spacecraft 51 outermost layers 51 unaided eye 51 HD# [005] 51 Geminid meteors 51 zodiacal light 51 Sidewalk Astronomers 51 WMAP satellite 51 NASA STEREO 51 galactic cores 51 Kuiper Belt Object 51 spectral fingerprints 51 Atacama Large Millimeter submillimeter 51 asteroidal 51 Saturn moon 51 NASA Interstellar Boundary 51 Alycia Weinberger 51 HiRISE camera aboard 51 Earth magnetotail 51 JPL manages 51 BRACELET MEASUREMENTS Opening 51 radioisotope thermoelectric generators 51 KH #D 50 infrared spectral 50 spatially resolved 50 neutrino telescope 50 Jonathan Lunine 50 SuperWASP 50 nicknamed Xena 50 moons Io 50 extrasolar planets 50 HARPS instrument 50 Voyager spacecraft 50 synchronous polar 50 weakly interacting 50 Las Campanas Observatory 50 VLBA 50 Antarctic Dry Valleys 50 telescopic observations 50 martian rocks 50 Saturn outermost ring 50 faintest galaxies 50 twin STEREO spacecraft 50 Eta Carinae 50 Ionosphere Sounding 50 supernova explosion 50 constellation Orion 50 emits X rays 50 Imaging Spectroradiometer MODIS instrument 50 Titan smoggy 50 Comet Elenin 50 moon permanently shadowed 50 NASA Lunar Prospector 50 Voorwerp 50 Milky Way 50 Array ALMA 50 Hadley Rille 50 extinct volcanoes 50 prebiotic molecules 50 Gamma rays 50 ionized gas 50 globular star 50 Cretaceous periods 50 NASA twin STEREO 50 Extrasolar planets 50 Saturn Jupiter Uranus 50 Supernovae 50 basaltic rocks 50 Nasa spacecraft