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(Click for frequent words.) 66 icy moon Enceladus 63 Nasa spacecraft 63 Uranus Jupiter 63 Cassini Huygens Mission 63 orbiting Cassini spacecraft 63 Fermi telescope 62 prograde 62 WISE infrared 61 Cassini flyby 61 WISE spacecraft 61 GALEX 60 spacecraft Cassini 60 orbiter Cassini 60 Saturn moons Enceladus 60 periodic dimming 60 moon Enceladus 60 Cassini Huygens spacecraft 60 Ringed Planet 59 stellar occultation 59 spacecraft flyby 59 exosphere 59 ray Space Telescope 59 NASA Interstellar Boundary 59 Bug Nebula 59 airglow 59 Composite Infrared Spectrometer 59 moon Io 59 Ulysses spacecraft 59 Upsilon Andromedae 59 Uranus Neptune 59 spacecraft orbiting 59 Neptune Uranus 59 Comet 9P/Tempel 1 58 Epsilon Aurigae 58 Saturn Cassini 58 Jupiter Ganymede 58 NASA Cassini orbiter 58 galaxy M# [001] 58 CoRoT satellite 58 planetary Transits 58 P/# A2 58 Kepler 9c 58 backscattered 58 Comet Hartley 2 58 geyser plumes 58 stellar occultations 58 slender crescent 58 Evolution Explorer 58 Neptune Uranus Jupiter 58 NASA EPOXI mission 58 planet Gliese #g 58 exoplanetary 57 gamma ray observatory 57 smallest exoplanet 57 XMM Newton 57 eclipsing binary 57 X ray afterglow 57 Saturn 57 Galilean moons 57 jovian 57 NASA Voyager spacecraft 57 orbiting gamma ray 57 cosmic cannibal 57 comets orbiting 57 occultations 57 IRAS #-# 57 Epsilon Eridani 57 innermost planet 57 magnetotail 57 Ring Nebula 57 OGLE TR #b 57 X ray observatories 57 Upsilon Andromedae b 57 Phoebe orbits 57 RXTE 57 Mars Odyssey spacecraft 56 volcanic moon Io 56 retrograde orbit 56 Huygens lander 56 IBEX spacecraft 56 Neutron Spectrometer 56 Jovian moons 56 Mars Reconnaissance Orbiter MRO 56 Galileo spacecraft 56 Samuel Oschin Telescope 56 mu Arae 56 Kuiper Belt Objects 56 Orion constellation 56 NASA Cassini 56 exoplanet orbiting 56 orbiting Kepler telescope 56 gaseous planet 56 closest flyby 56 moons Phobos 56 Autodata Corp. Pontiac 56 binary quasar 56 Express orbiter 56 exo planets 56 Corot 7b 55 Infrared Mapping Spectrometer VIMS 55 Saturn outermost 55 sized planets orbiting 55 Mars Pathfinder lander 55 MG J# +# 55 NFIRE satellite 55 Saturn moon Mimas 55 Stephan Quintet 55 NASA Far Ultraviolet 55 auroral emissions 55 Mars Uranus 55 EPOXI spacecraft 55 Orbiter LRO 55 Neptune Jupiter 55 Carina constellation 55 moonquakes 55 Gliese #e 55 Saturnian moons 55 GRB #B 55 constellation Carina 55 retrograde orbits 55 ROSAT 55 Elenin 55 orbiting spacecraft 55 PSR B# 55 twin STEREO spacecraft 55 Comet Lulin 55 Toutatis 55 S/# [001] 55 gamma ray flares 55 galactic disk 55 moons orbiting Saturn 55 Cassini flybys 55 Saturnian moon 55 Planck satellite 55 planet magnetosphere 55 Huygens descent 55 exoplanets orbiting 55 exoplanets planets 54 Great Orion Nebula 54 Clementine spacecraft 54 infall 54 RHESSI 54 star Spica 54 comet McNaught 54 Galaxy Evolution 54 Muchachos Observatory 54 Comet Halley 54 Explorer GALEX 54 Neutral Mass Spectrometer 54 Solar TErrestrial RElations Observatory 54 moons orbiting 54 Martian lander 54 elongated orbits 54 NASA Cassini spacecraft 54 Solar Dynamics Observatory 54 brightest supernova 54 ESA Planck 54 visit http:/saturn.jpl.nasa.gov 54 flyby Cassini 54 Charon Pluto 54 Spitzer infrared 54 Fetal heartbeats 54 reflection nebula 54 Near Infrared Camera 54 Gliese #c 54 Relations Observatory STEREO 54 gravitational tides 54 particle analyzers 54 SN #A 54 constellation Aquarius 54 Mars moon Phobos 54 Viking orbiters 54 planet Uranus 54 NASA QuikScat satellite 54 Fomalhaut b 54 Nasa Mars Odyssey 54 Multi Object Spectrograph 54 NASA Wilkinson Microwave 54 Mauna Kea Hawaii 54 Descent Imager Spectral Radiometer 54 Planetary Transits 54 Ultraviolet Imaging Spectrograph UVIS 54 Venus Neptune Uranus 54 BLG #Lb 54 subsurface ocean 54 Eagle lunar lander 54 radial velocity 54 Cassini 54 Geminga 54 Wilkinson Microwave Probe 54 spectroscopically 53 amateur astronomers peering 53 retroreflector 53 telescopic observations 53 X ray telescopes 53 Kuiper Belt Object 53 lobate scarps 53 SN#A 53 GQ Lupi 53 Galilean satellites 53 Explorer WISE 53 X ray observatory 53 #P/Churyumov-Gerasimenko 53 Io Europa 53 WISE telescope 53 Saturn Enceladus 53 orbiting Chandra 53 Earth magnetotail 53 Lunar Reconnaissance Orbiter LRO 53 Saturn magnetosphere 53 Jupiter Uranus 53 Valles Marineris 53 Saturn Jupiter Uranus 53 transiting planet 53 TrES 4 53 Magellanic Clouds 53 Pleiades star 53 Mössbauer 53 constellation Virgo 53 magnetospheric 53 Rosetta spacecraft 53 ESA Huygens probe 53 MESSENGER spacecraft 53 planets orbits 53 extrasolar 53 Giovanni Cassini 53 moons circling 53 VIRTIS 53 constellation Andromeda 53 orbited Jupiter 53 Mercury flyby 53 Convection Rotation 53 emit X rays 53 Hubble Near Infrared 53 Anisotropy Probe WMAP 53 Sojourner Rover 53 orbiter Mars Odyssey 53 ultraviolet imaging spectrograph 53 Mars Neptune Uranus 53 polar vortex 53 Comet Hale Bopp 53 planets Uranus 53 Gamma ray burst 53 Flyby 53 constellation Scorpius 53 Comet Holmes 53 Infrared Thermal Imaging Spectrometer 53 Titan flyby 53 multiband imaging photometer 53 NASA Lunar Prospector 53 gamma ray photons 53 transiting exoplanets 53 HiRISE camera aboard 53 Epimetheus 53 lensing galaxy 53 GRB# 53 constellation Centaurus 53 spiral galaxy Messier 53 spherical halo 53 Cassini orbiter 53 planets orbiting distant 53 spiral galaxy NGC 53 NASA MESSENGER spacecraft 53 galaxy M# [002] 53 fainter objects 53 gravitational interaction 53 robotic explorer 53 constellation Eridanus 53 flyby spacecraft 53 elliptical galaxy NGC 53 planemos 53 Voyager spacecraft 53 aurorae 53 planetary nebulas 53 Saturn moon 53 Pleiades cluster 53 constellation Cassiopeia 53 tau neutrino 53 Cassini Finds 53 zodiacal light 53 millisecond pulsar 53 Kuiper belt objects 53 comet Churyumov Gerasimenko 53 Global Surveyor spacecraft 53 Saturn moon Enceladus 53 comet flyby 52 Beta Pictoris b 52 rotational axis 52 X ray emission 52 transiting exoplanet 52 Exoplanets 52 Lunar CRater Observation 52 Red Rectangle 52 Hyakutake 52 neutron spectrometer 52 Spectroscopic Explorer 52 ESA Integral 52 thin crescent 52 GJ#b 52 SOHO spacecraft 52 Cassini Spacecraft 52 Infrared Astronomical Satellite IRAS 52 antineutrinos 52 Cassini spacecraft 52 elongated orbit 52 Hubble Space Telescope HST 52 planets orbiting sun 52 highly elliptical orbit 52 Exoplanet 52 earthshine 52 constellation Hercules 52 asteroid Steins 52 active galactic nucleus 52 geosynchronous satellite launch 52 circumstellar disks 52 Rosette Nebula 52 Huygens spacecraft 52 Butterfly Nebula 52 Heliospheric Observatory SOHO 52 Multi Object Spectrometer 52 spacecraft Chandrayaan 1 52 X ray Telescope XRT 52 galactic cosmic rays 52 cosmic ray particles 52 Comet Hartley 52 comet Lulin 52 HD#b 52 HUDF 52 KH #D 52 cometary debris 52 Orionid meteors 52 whiz harmlessly 52 Nasa Mars Reconnaissance 52 coronagraph 52 spacecraft orbited 52 relativistic particles 52 Kepler Telescope 52 NASA WMAP 52 Saturnian 52 Beta Pictoris 52 Hubble orbits 52 star Beta Pictoris 52 RS Ophiuchi 52 cosmological distances 52 Epoxi 52 NASA Spacecraft 52 Orbiter MRO 52 VY Canis Majoris 52 Kepler Space Telescope 52 Rover Opportunity 52 NASA Kepler spacecraft 52 starlike object 52 orbiting observatories 52 Saturn outermost ring 52 substorm 52 Nikku Madhusudhan 52 G#.# +#.# 52 interstellar dust clouds 52 geoneutrinos 52 Rockot launch 52 microlensing events 52 circumstellar 52 Sagittarius B2 52 rocky extrasolar planet 52 Moderate Resolution Imaging 52 icy moons 52 constellation Ursa Major 52 constellation Draco 52 HD# [002] 52 twin Voyager spacecraft 52 Triangulum 52 Pluto Charon 52 NASA Opportunity rover 52 Messenger spacecraft 52 GJ #b [002] 52 Omega Centauri 52 diffuse aurora 52 moon Deimos 52 BBSNews #-#-# NASA 52 SN #D 52 intrinsic brightness 52 GLAST telescope 52 Mars Jupiter Uranus 52 Diviner 52 Mercury Uranus 52 UVOT 52 XMM Newton satellite 52 Crab Pulsar 52 Mars Saturn Uranus 52 gamma ray spectrometer 52 interacting galaxies 52 Chandra Observatory 52 Wilkinson Microwave Anisotropy Probe 52 Herschel Space Telescope 52 ESA ASI 52 muon neutrino 52 Omega Nebula 52 Abnormal radiation 52 sunlike star 52 outer heliosphere 52 unmanned Chandrayaan 52 moon Ganymede 51 HiRISE image 51 NASA THEMIS 51 moon Mimas 51 IRC +# 51 probe Huygens 51 heavily cratered 51 Lander robotic arm 51 RY Sagittarii 51 asteroid Vesta 51 Telescope BAT 51 waning gibbous 51 Titan smoggy 51 Churyumov Gerasimenko 51 Virgo Cluster 51 constellation Lacerta 51 Comet Machholz 51 Viking Orbiter 51 supergiant stars 51 smallest exoplanets 51 HD #b [001] 51 Sombrero Galaxy 51 COROT exo 3b 51 laser altimeter 51 moon Iapetus 51 ESA XMM Newton 51 thin crescent moon 51 meteoritic material 51 Jupiter moons 51 planetary transits 51 celestial object 51 Perseus Cluster 51 Ranging MESSENGER spacecraft 51 http:/saturn.jpl.nasa.gov 51 planet gravitational tug 51 Spectrograph 51 Imaging Spectroradiometer MODIS instrument 51 Viking landers 51 COROT 7b 51 J#.# [001] 51 Voyager probes 51 blazars 51 Jovian moon 51 Extrasolar planets 51 Stardust spacecraft 51 Moon Mineralogy Mapper M3 51 Suzaku X ray 51 geo synchronous 51 KAGUYA 51 Odyssey orbiter 51 Voorwerp 51 CoRoT 7b 51 photosphere 51 Kuiper belt object 51 Mars Color Imager 51 Philae lander 51 Syrtis Major 51 Fermi Telescope 51 Cassini Image 51 mere fly bys 51 largest moon Charon 51 smallest extrasolar planet 51 NASA Stardust spacecraft 51 Opportunity rover 51 Astrophysics MOA 51 exo planet 51 Lagoon Nebula 51 irregularly shaped asteroid 51 ESA Herschel 51 occulted 51 protoplanet 51 Planck spacecraft 51 APXS 51 comet nucleus 51 Quaoar 51 planets orbiting stars 51 interplanetary spacecraft 51 Venus Jupiter Uranus 51 accretion disks 51 Mini Thermal Emission 51 Jupiter Saturn 51 AU Mic 51 Mars orbiting spacecraft 51 Planck telescope 51 icy comets 51 synchronous polar 51 Nasa Kepler 51 impactor spacecraft 51 distant galaxy 51 Valles Marineris canyon 51 spectral characteristics 51 Infrared Mapping Spectrometer 51 transiting planets 51 WMAP satellite 51 waxing crescent 51 nebulosity 51 foreground galaxy 51 Earth ionosphere 51 Keck Interferometer 51 telescope eyepiece 51 V# Mon 51 NASA CloudSat 51 outermost planets 51 R Coronae Borealis 51 distant supernovae 51 Martian dust 51 entered lunar orbit 51 Saturnian system 51 interstellar particles 51 comet tail 51 amateur skywatchers 51 Proxima Centauri 51 circumstellar disk 51 comet Hartley 2 51 AGNs 50 sunlike stars 50 Spitzer infrared spectrograph 50 HM Cancri 50 Zeta Ophiuchi 50 NEAR Shoemaker 50 Candor Chasma 50 Orionids 50 Neutron Detector 50 sundog 50 NASA ICESat 50 Orion Nebula 50 Taurus Littrow Valley 50 X ray spectrometer 50 Jupiter moon Io 50 Saturn equinox 50 ESA Rosetta 50 Yinghuo 1 50 Ranging spacecraft 50 Cepheid variable 50 Shoemaker Levy 50 constellation Puppis 50 starburst galaxy 50 AB Aurigae 50 photometer 50 ionized particles 50 globular cluster M# 50 solar corona 50 Triangulum Galaxy 50 MESSENGER Spacecraft 50 coronal loops 50 Fermi Gamma ray 50 inhabitable planets 50 AKARI 50 NASA Fermi Gamma 50 Hale Bopp 50 Comet Elenin 50 heliospheric 50 YOUR HOROSCOPE 50 lunar equator 50 gravitational lens 50 Kepler #b 50 Martians invading 50 Saturn moon Iapetus 50 Mars Orbiter Camera 50 earthlike planets 50 circular orbit 50 Investigation DIXI 50 gravitational microlensing 50 radial velocity method 50 Rosetta orbiter 50 double helix nebula 50 comet Hale Bopp 50 NASA rovers Spirit 50 Mars Odyssey orbiter 50 piggybacked Huygens probe 50 distant galaxy clusters 50 NASA twin rovers 50 TerraSAR X satellite 50 filamentary structures 50 http:/www.nasa.gov/cassini 50 X ray binary 50 Mercury magnetosphere 50 Planetary Fourier Spectrometer PFS 50 Saturn moons Titan 50 XMM Newton X ray 50 Son Nghiem 50 coronal holes 50 Observatory SDO 50 Orion nebula 50 constellation Cetus 50 red supergiant 50 astrophysical objects 50 Comet LINEAR 50 Venus Uranus 50 shepherding spacecraft 50 Optical Spectroscopic 50 orbiting Mars 50 enters lunar orbit 50 robotic spacecraft 50 Anisotropy Probe 50 SOHO LASCO 50 trans Neptunian objects 50 planet orbits 50 Terrain Mapping Camera 50 proton antiproton 50 Dynamics Observatory 50 Gamma ray 50 Eridanus 50 filamentary structure 50 Imaging Spectrometer 50 NASA MESSENGER 50 Galactic cosmic rays 50 OMEGA instrument 50 spacecraft 50 crystalline silicates 50 Doppler shifts 50 New Horizons spacecraft 50 extrasolar planets orbiting 50 onboard Chandrayaan 50 Vulpecula 50 PSR B# +# 50 electron neutrinos 50 interstellar boundary 50 Eagle Nebula 50 Pluto Uranus 50 celestial sphere 50 interstellar dust 50 Comet McNaught 50 solar prominences 50 Pancam 50 Martian crater 50 Cassini Regio 50 Mars Uranus Neptune 50 Observatory STEREO 50 orbits Saturn 50 Cancri e 50 orbiting 50 Mars Pathfinder 50 constellation Gemini 50 YU# 50 Martian permafrost 50 comet chaser 50 Andromeda galaxy 50 Helix nebula 50 Milky Way halo 50 moonlets 50 arcminutes 50 planet orbiting 50 Kaguya spacecraft 50 spiral nebulae 50 polar craters 50 Shepherding Spacecraft 50 Terra Sirenum 50 Earth orbiting satellites 50 Kuiper Belt object 50 constellation Taurus 50 Jupiter magnetosphere 50 Trojan asteroids 50 asteroidal 50 Mars Orbiter 50 Lulin 50 orbital eccentricity 50 stellar seismology 50 ESO PR 50 hydrocarbon haze 50 planet HD #b 50 Saturn outermost moon 50 waitress Ingrid Sufan 50 Cosmic Background Explorer 50 THEMIS satellites 50 copper impactor 50 Rosetta comet chaser 49 Lyman alpha 49 Hanny Voorwerp 49 NASA rover Spirit 49 twin ultrasonic rangefinders 49 extrasolar planetary 49 HL Tau 49 energetic electrons 49 Earth Asteroid 49 antiproton 49 GJ #b [001] 49 GRB #A 49 Horsehead Nebula 49 orbital inclination 49 Delta Cephei 49 Space ENvironment GEochemistry 49 ultraviolet wavelengths 49 Saturnian moon Titan 49 Ontario Lacus 49 Mimas 49 nebular 49 probe Akatsuki 49 orbit GEO 49 Infrared Array Camera 49 interstellar dust grains 49 Corot 9b 49 VHE gamma rays 49 Mars Odyssey Orbiter 49 DISR 49 Reflection Radiometer 49 STEREO spacecraft 49 infrared telescope 49 windshield wiper maneuver 49 orbital rendezvous 49 Hubble observations 49 Perseus constellation 49 Alpha Particle 49 supergiant star 49 CoRoT #b 49 Tauri Sb 49 TrES 49 merging galaxies 49 constellation Sagittarius 49 Astronomers Find 49 starquakes 49 MUSES C 49 distant quasars 49 twin rover Spirit 49 gamma rays emitted 49 Aqua satellite 49 Foton spacecraft 49 extrasolar planet HD #b 49 constellation Perseus 49 PSLV C# rocket 49 ARRL AMSAT 49 Fionnuala Bourke 49 Beehive Cluster 49 ESO VLT 49 THEMIS Image 49 magnetopause 49 NASA twin STEREO 49 faraway galaxy 49 constellation Bootes 49 Cassini ultraviolet 49 reddish orange hue 49 X ray wavelengths 49 Cherenkov radiation 49 polar mesospheric clouds 49 martian soil 49 submillimetre wavelengths 49 Kepler Mission 49 constellations Cygnus 49 Seyfert galaxies 49 extrasolar planet 49 thrilling stargazers 49 rotating neutron stars 49 GOCE satellite 49 gravitational tugs 49 RRATs 49 constellation Auriga 49 Mars Reconnaissance Orbiter 49 THEMIS spacecraft 49 Hubble Captures 49 auroral 49 KBOs 49 gravitational wobbles 49 geysers erupting 49 buckypaper virtually 49 Gravitational waves 49 starlike 49 gravitational perturbations 49 Cygnus Lyra region 49 barred spiral galaxy 49 ringed planet 49 Enceladus flybys 49 NGC #A 49 planets comets 49 infrared ultraviolet 49 GRB # 49 galactic bulge 49 CoRoT 9b 49 Impact Probe MIP 49 Reconnaissance Orbiter 49 Helix Nebula 49 Cassini Huygens 49 spectroscopic observations 49 Mount Bosavi 49 telescope Uranus 49 infrared spectrometers 49 planets constellations 49 Mars rovers Opportunity 49 Mars Global Surveyor 49 WASP #b 49 TNOs 49 QQ# 49 magnetic substorms 49 Puppis 49 moonlet 49 discover Fomalhaut 49 X ray pulses 49 BP Piscium 49 Magnetospheric 49 Sojourner rover 49 IKAROS 49 GA6 49 Cat Paw Nebula 49 Thermal Emission Spectrometer 49 HII regions 49 Monoceros 49 Corona Australis 49 UDFy # 49 constellation Cepheus 49 equatorial bulge 49 Cosmic Microwave Background 49 LASCO imagery 49 smoothest flattest spot 49 lightweight synthetic aperture 49 moon Dione 49 Infrared Pathfinder Satellite 49 Cassini imaging 49 Bonneville Crater 49 star Proxima Centauri 49 axial tilt 49 infrared observatory 49 waning crescent 49 Veil Nebula 49 hydroxyl molecules 49 Context Camera 49 HARPS instrument 49 Tropospheric Emission Spectrometer 49 afterglows 49 silicate dust 49 inner Oort Cloud 49 Keck telescopes 49 Methone 49 Libra adore 49 constellation Cygnus 49 aboard Taurus XL 49 ESA SMART 49 reentry capsule 49 circular orbits 49 Caloris Basin 49 radial velocity technique 49 faintest galaxies 49 rovers Spirit 49 Magellanic Stream 49 Arabia Terra 49 permanently shadowed craters 49 penumbral shadow 49 constellation Monoceros 49 astrophysical phenomena 49 Noctilucent clouds 49 NASA Kepler telescope 49 Magnetosphere 49 electron orbits 49 Saturn Moons 49 extraterrestrial civilizations 49 HD #b [002] 49 Fermi LAT 49 inch Samuel Oschin 49 Andromeda Galaxy 49 SKY WATCH 48 geo synchronous transfer 48 SPICAM 48 Diviner instrument 48 electron neutrino 48 gravitational wobble 48 magnetic polarity 48 Kazakhstan Baikonur Cosmodrome 48 Earthlike planet 48 active galactic nuclei 48 extrasolar planets 48 supernova SN 48 LINEAR 48 NASA Mars Reconnaissance 48 HESS telescopes 48 meteoroid 48 distant quasar 48 Perseid meteor 48 Deep Impact probe 48 Higgs bosons 48 neutral mass spectrometer 48 perihelion 48 microshutters 48 Ray Spectrometer 48 Keck telescope 48 Saturn Uranus 48 Saturn aurora 48 Ultraviolet Optical Telescope 48 Kuiper Belt objects 48 dwarf spheroidal galaxies 48 constellation Aquila 48 rotating neutron 48 Meen Rashi 48 gravitational interactions 48 radio occultation 48 Herschel Space 48 NASA Gamma ray 48 proto cluster 48 smoggy atmosphere 48 perilune 48 hypervelocity stars 48 blue supergiant 48 Ocean Salinity 48 constellation Pegasus 48 moons Europa 48 Sounder AIRS instrument 48 S/# P2 48 Io volcanoes 48 SeaWiFS 48 Trifid Nebula 48 dynamical evolution 48 Jupiter icy moons 48 Europa Orbiter 48 THEMIS Images 48 lunar highlands 48 Chang'eI 48 imaging spectrometer 48 proplyds 48 SECCHI 48 galaxies collide 48 Burst Alert 48 Supernova #A 48 Greenbelt Md. manages 48 galaxy NGC 48 noctilucent clouds 48 Mossbauer 48 NOAA GOES 48 hunting Kepler telescope 48 radar interferometry 48 Microlensing 48 electric ion propulsion 48 Jupiter flyby 48 protoplanetary 48 navigate autonomously 48 wavelength infrared 48 UKIRT 48 neutrino particles 48 VB #b 48 Wolszczan 48 microquasar 48 Envisat satellite 48 waxing gibbous moon 48 constellation Vulpecula 48 Comet NEAT 48 Aram Chaos 48 Mercury exosphere 48 VLBA observations 48 Eta Carinae 48 Martian moons Phobos 48 Comet #P 48 ESO telescopes 48 planet transits 48 XO 3b 48 proto planetary disk 48 spectrometric 48 N. Rathnasree 48 Lunar Prospector 48 Mini TES 48 magma ocean 48 UVIS 48 orbiting Saturn 48 Shackleton crater 48 Atlantis undocks 48 LAGEOS 48 CMB radiation 48 SNR #-#.# 48 Flyby spacecraft 48 moon Phobos 48 Orcus Patera 48 star Gliese 48 Gusev crater 48 mooncraft 48 Solar Optical Telescope 48 Launch Postponed 48 Spitzer Space Telescopes 48 SpaceShip 48 type Ia supernova 48 highly elliptical orbits 48 Spitzer Infrared Array 48 Comet Churyumov Gerasimenko 48 spatially resolved 48 Trifid 48 JCMT 48 Shuttle Endeavour docks 48 Saturn auroras 48 Digitalglobe 48 Pegasus constellation 48 astronomer Clyde Tombaugh 48 Lunar Rover 48 Huygens Probe 48 Eta Aquarid meteor shower 48 galactic equator 48 Deep Impact eXtended Investigation 48 CDMS experiment 48 Coma Cluster 48 Ian McShane Pillars 48 spaceweather.com 48 Planck observatory 48 protoplanetary disks 48 Observatory Very 48 Global Surveyor 48 Martian surface 48 martian atmosphere 48 Libra constellation Vogt 48 NASA Kepler 48 planets orbiting 48 detect gravitational waves 48 auroral displays 48 gamma ray emission 48 astronomical objects 48 Quadrantid meteor shower