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(Click for frequent words.) 78 Comet Hartley 2 70 NASA Stardust spacecraft 70 NASA EPOXI mission 70 comet Wild 68 comet Hartley 2 68 Comet Lulin 67 Churyumov Gerasimenko 67 Comet Halley 66 NASA Cassini spacecraft 66 comet nucleus 66 ESO PR 66 spiral galaxy NGC 66 Perseids Meteor Shower 66 Comet #P/Churyumov-Gerasimenko 66 ESA SMART 65 Lunar Reconnaissance Orbiter LRO 65 LORRI 65 asteroid Steins 65 constellation Aquarius 65 ray Space Telescope 65 flyby spacecraft 64 Quadrantid meteor shower 64 Comet Holmes 64 slender crescent 64 Cassini flyby 64 Orionids 64 Aqua satellite 64 comet Lulin 64 Saturnian moon Titan 64 Saturn Cassini 64 waxing gibbous moon 64 Fermi telescope 64 EPOXI mission 64 Comet Tempel 1 64 THEMIS Images 64 ESA Integral 64 constellation Carina 64 Galileo spacecraft 64 NASA STEREO 63 Cassini Huygens spacecraft 63 Stardust spacecraft 63 Orbiter LRO 63 STEREO spacecraft 63 comet 63 MESSENGER spacecraft 63 planet TrES 63 planet Uranus 63 CoRoT 63 Orionid meteor shower 63 GALEX 63 New Horizons spacecraft 63 Toutatis 63 Ulysses spacecraft 63 IBEX spacecraft 63 Shoemaker Levy 62 Titan flyby 62 NASA LCROSS 62 Solar Dynamics Observatory 62 COROT 62 EPOXI spacecraft 62 spacecraft Cassini 62 asteroid Itokawa 62 occultations 62 Orbiter MRO 62 comet McNaught 62 Deep Impact eXtended Investigation 62 GRB #B 62 Quadrantids 62 spaceweather.com 62 CoRoT satellite 62 SIRTF 62 Rosetta spacecraft 62 Solar TErrestrial RElations Observatory 62 galaxy M# [001] 62 Kepler spacecraft 62 Cassini Huygens 62 ESA Rosetta 62 arcminutes 62 arcsec 62 Sojourner Rover 62 thin crescent moon 62 NASA MESSENGER spacecraft 62 NASA Wilkinson Microwave 62 constellation Centaurus 62 RQ# 62 Earth asteroid Itokawa 61 arcsecond 61 Deep Impact flyby spacecraft 61 airglow 61 TrES 61 YU# 61 Epoxi 61 Epsilon Eridani 61 comet Tempel Tuttle 61 irregularly shaped asteroid 61 waxing crescent moon 61 Comet NEAT 61 asteroid Eros 61 Nasa spacecraft 61 Huygens descent 61 Tempel Tuttle 61 innermost planet 61 Lunokhod 61 Comet 9P/Tempel 1 61 Observatory SDO 61 waning crescent Moon 61 Ringed Planet 61 #P/Churyumov-Gerasimenko 61 SpaceWeather.com 61 Planck satellite 61 Infrared Pathfinder Satellite 61 Comet Boethin 61 cometary debris 61 WISE infrared 61 Mars Reconnaissance Orbiter MRO 60 Viking Lander 60 Explorer WISE 60 LCROSS spacecraft 60 MG J# +# 60 constellation Andromeda 60 Mössbauer 60 Saturn moon Iapetus 60 Fomalhaut b 60 Eta Aquarids 60 Convection Rotation 60 Ranging MESSENGER spacecraft 60 Saturn moon Enceladus 60 NASA Deep Impact 60 ringed planet 60 Deep Impact craft 60 galaxy NGC 60 waning gibbous 60 arcseconds 60 Mars moon Phobos 60 Sensing Satellite LCROSS 60 Ring Nebula 60 Advanced Synthetic Aperture 60 Mars Orbiter 60 NASA Aqua 60 gamma ray observatory 60 Planck telescope 60 constellation Cetus 60 Messenger spacecraft 60 Jupiter moon Io 60 gaseous planet 60 asteroid Vesta 60 exoplanetary 60 transiting planet 60 comet Churyumov Gerasimenko 60 thin crescent 60 Mars Color Imager 60 star Spica 60 Perseid meteor 60 WFC3 60 TRMM satellite 60 SOHO spacecraft 60 celestial sphere 60 Upsilon Andromedae 60 Mpc 60 Swift Tuttle 60 NASA Cassini 60 Earth radii 60 WISE spacecraft 60 spiral galaxy Messier 60 X ray pulses 60 VIRTIS 60 Mercury flyby 59 orbiting Saturn 59 comet tail 59 DigitalGlobe WorldView 59 comet #P/Churyumov-Gerasimenko 59 polarimetry 59 comet flyby 59 Pancam 59 Imaging Spectroradiometer MODIS instrument 59 Mars Odyssey spacecraft 59 Rosetta orbiter 59 Relations Observatory STEREO 59 DISR 59 NOAA GOES 59 RS Ophiuchi 59 Opportunity rover 59 star Gliese 59 Virgo Cluster 59 Eta Aquarid meteor shower 59 THEMIS satellites 59 Epsilon Aurigae 59 highly elliptical orbits 59 cometary 59 stellar occultations 59 planetary Transits 59 WISE telescope 59 Mission TRMM satellite 59 CALIPSO 59 NEAs 59 O OREOS 59 Saturnian system 59 Crab Nebula 59 NASA Lunar Crater 59 Venusian surface 59 Context Camera 59 constellation Virgo 59 sunlike star 59 Hubble Space Telescope HST 59 HD#b 59 Heliospheric Observatory SOHO 59 Rosette Nebula 59 distant quasar 59 solar radii 59 Comet Machholz 59 NASA Interstellar Boundary 59 meter Keck telescope 59 ESA ASI 59 waxing crescent 59 EPOXI 59 Ranging spacecraft 59 radial velocity 59 NASA Kepler 59 Pleiades star 59 Stardust NExT mission 59 gibbous moon 59 Deep Impact comet 59 Comet Encke 59 Stardust capsule 58 Comet Tempel Tuttle 58 Cassini 58 Lyrid meteor shower 58 http:/www.nasa.gov/cassini 58 NASA Kepler telescope 58 Opportunity Mars rover 58 LightSail 58 waxing gibbous 58 Voyager spacecraft 58 Taurids 58 Andromeda Galaxy 58 waning gibbous moon 58 spacecraft flyby 58 Deep Impact spacecraft 58 Saturnian 58 Lunar Crater 58 comet Tempel 1 58 Cosmic Microwave Background 58 barred spiral galaxy 58 meteoroid 58 SuitSat 58 Moderate Resolution Imaging 58 Cassini spacecraft 58 constellation Bootes 58 Comet #P 58 Meteor Shower 58 Cloud Aerosol Lidar 58 Mars CRISM 58 sun corona 58 cosmological distances 58 WISE mapped 58 Halley comet 58 Saturn moon Mimas 58 Leonid meteor showers 58 shepherding spacecraft 58 Martian rovers 58 Gamma Virginids 58 Orionid 58 Comet McNaught 58 Deep Impact probe 58 NASA Lunar Reconnaissance 58 HiRISE camera 58 Kepler Space Telescope 58 HD #b [001] 58 Samuel Oschin Telescope 58 crescent Moon 58 X ray afterglow 58 detect gamma rays 58 cometary dust 58 Helix Nebula 58 stellar occultation 58 interstellar particles 58 Keck Interferometer 58 Leonid meteor 58 substorm 58 ultraviolet imaging spectrograph 58 impactor spacecraft 58 Leonid Meteor Shower 58 EPOCh 58 orbiting Hubble Space Telescope 58 Enceladus flyby 58 Lunar CRater Observation 58 Saturn moon 58 Saturn equinox 58 closest flyby 58 Extrasolar Planet Search 58 planetary nebulas 57 Express orbiter 57 # Apophis 57 WMAP satellite 57 Elenin 57 galactic disk 57 lunar perigee 57 Stardust NExT 57 ESA Huygens probe 57 NFIRE satellite 57 Lagoon Nebula 57 Pluto Charon 57 Bug Nebula 57 smallest exoplanet 57 Cancri e 57 extrasolar 57 GRB# 57 mu Arae 57 infrared telescopes 57 Corot 7b 57 extrasolar planet 57 millisecond pulsar 57 Saturn rings 57 Jupiter magnetosphere 57 Gusev crater 57 Envisat satellite 57 Geminid meteor shower 57 Eridani 57 Flyby 57 Kepler Mission 57 XMM Newton 57 Mars Opportunity rover 57 comet chaser 57 constellation Hercules 57 twin Voyager spacecraft 57 Red Rectangle 57 ESO VLT 57 ESA Envisat 57 Rosetta comet chaser 57 DIXI 57 Trifid Nebula 57 noctilucent clouds 57 solar corona 57 Shepherding Spacecraft 57 perihelion 57 Ocean Salinity SMOS 57 Comet LINEAR 57 HD #b [002] 57 Galaxy Evolution 57 Geminid shower 57 NASA Fermi Gamma 57 Cassini flybys 57 galaxy cluster 57 Pleiades cluster 57 Saturn moons 57 cosmic cannibal 57 magnetotail 57 z ~ 57 Solar Dynamics 57 Crab Pulsar 57 Planck spacecraft 57 CoRoT 7b 57 GJ #b [002] 57 NGC #A 57 moon Io 57 http:/saturn.jpl.nasa.gov 57 Butterfly Nebula 57 exoplanets orbiting 57 Perseid shower 57 outer planets 57 Exoplanet 57 Hayabusa capsule 57 MODIS 57 Nasa Mars Reconnaissance 57 Uninhabited Aerial Vehicle 57 GJ #b [001] 57 spacecraft orbiting 57 waning crescent 57 Mars Orbiter Camera 57 aboard ESA Envisat 57 Titan flybys 57 Ultraviolet Imaging Spectrograph UVIS 57 Infrared Mapping Spectrometer VIMS 57 orbiting 57 rover Spirit landed 57 GA6 57 HUDF 57 constellation Taurus 57 Jenniskens 57 inch Samuel Oschin 57 outermost planets 57 Orionid meteors 57 Tempel 1 57 robotic explorer 57 Hubble orbits 57 Geminga 57 Measuring Mission TRMM 57 NASA THEMIS 57 constellation Sagittarius 56 fainter objects 56 planetary surfaces 56 rover Opportunity 56 Isidis Planitia 56 WFPC2 56 Nasa Kepler 56 NASA Voyager spacecraft 56 Saturnian moon 56 penumbral lunar eclipse 56 Perseus Cluster 56 spectral bands 56 hubble 56 SIM PlanetQuest 56 constellation Cassiopeia 56 constellation Eridanus 56 Jupiter Saturn 56 Mars Lander 56 distant galaxy 56 neutral mass spectrometer 56 Geminid meteor showers 56 Imaging Spectroradiometer MODIS 56 Earthlike planet 56 MN4 56 flyby 56 THEMIS spacecraft 56 albedo reflectivity 56 orbiting Hubble telescope 56 laser altimeter 56 galaxy M# [002] 56 exoplanets planets 56 NASA MErcury Surface 56 Earth orbiting satellites 56 comet Hale Bopp 56 asteroid Lutetia 56 interferogram 56 NASA Opportunity rover 56 Galilean moons 56 interacting galaxies 56 comet dust 56 Moderate Resolution 56 skywatching 56 ultraviolet wavelengths 56 interstellar dust particles 56 orbital velocity 56 Sagittarius B2 56 LRO spacecraft 56 infrared wavelength 56 ESA Planck 56 micron wavelengths 56 WASP #b 56 predawn sky 56 Orion Nebula 56 Digitized Sky Survey 56 planets comets 56 X ray telescopes 56 Lunar Crater Observation 56 Block 5D 56 Leonid meteor shower 56 NASA CloudSat 56 rover Spirit 56 astrometric 56 Flyby spacecraft 56 Fermi Telescope 56 Perseid Meteor Shower 56 ESA XMM Newton 56 planet magnetosphere 56 giant elliptical galaxy 56 Cygnus Lyra region 56 periodic dimming 56 Nasa Mars Odyssey 56 celestial equator 56 penumbral shadow 56 Geminid meteors 56 hexagonal mirrors 56 X ray wavelengths 56 infrared satellite imagery 56 moon Deimos 56 globular cluster M# 56 Oort Cloud 56 orbiting observatories 56 jovian 56 NASA rovers Spirit 56 OGLE TR 56 Leonid meteors 56 Meteor shower 56 spectroscopically 56 Comet Churyumov Gerasimenko 56 supernova SN 56 RXTE 56 N. Rathnasree 56 interstellar dust 56 backscattered 56 Martian crater 56 constellation Scorpius 56 Spectrograph 56 PSR J# 56 P Churyumov Gerasimenko 56 eclipsing binary 56 Milky Way Galaxy 56 energetic electrons 56 exosolar planets 56 Hubble Telescope 56 Earth magnetotail 55 submillimeter wavelength 55 heliopause 55 Synthetic Aperture Radar SAR 55 orbiting gamma ray 55 antineutrinos 55 #P/Holmes 55 Cassini Huygens Mission 55 Krimigis 55 asteroid 55 orbited Jupiter 55 Methone 55 comets meteors 55 cluster NGC 55 constellation Auriga 55 Perseid meteors 55 extrasolar planets orbiting 55 twin STEREO spacecraft 55 mesosphere 55 lunar orbits 55 Multi Object Spectrometer 55 Orbiter spacecraft 55 Lulin 55 Cancri 55 constellation Puppis 55 Investigation DIXI 55 Perseids meteor shower 55 dimensional atlas 55 exosphere 55 planet Gliese #g 55 OGLE TR #b 55 solar prominences 55 NASAs 55 Atlantis undocks 55 TanDEM X 55 P/# A2 55 Martian surface 55 ESA Mars 55 NASA Stardust NExT 55 Mars Pathfinder lander 55 LADEE 55 zodiacal light 55 Kepler 9c 55 constellation Perseus 55 Thermal Emission Spectrometer 55 MESSENGER 55 HiRISE image 55 GQ Lupi 55 Geminids 55 constellation Leo 55 moon Phobos 55 NASA ESA Hubble 55 planetarium dome 55 highly elliptical orbit 55 Moderate Imaging Spectroradiometer 55 NASA Solar Terrestrial 55 ecliptic plane 55 Geminid 55 SINFONI 55 starlike object 55 moons Phobos 55 comets asteroids 55 OMEGA instrument 55 polar vortex 55 microquasar 55 binary quasar 55 coronal loops 55 Reconnaissance Orbiter 55 Noctilucent clouds 55 Helix nebula 55 Aquarius SAC 55 Gliese #e 55 earthshine 55 Envisat Advanced Synthetic Aperture 55 celestial object 55 lunar orbiter Chang'e 55 RRATs 55 NASA Spirit rover 55 Corot 9b 55 Satellite GOES 55 comet Shoemaker Levy 55 SN #A 55 Capricornus 55 MERIS 55 Space ENvironment GEochemistry 55 Earth magnetosphere 55 Mars Odyssey orbiter 55 aphelion 55 retrograde orbit 55 Zeta Ophiuchi 55 ESA ERS 55 Muchachos Observatory 55 absorbs photons 55 GLAST telescope 55 MODIS instrument 55 X ray emission 55 Gliese #c 55 VLTI 55 comet particles 55 icy moons 55 Planetary Transits 55 GRB # 55 Hale Bopp 55 Keck telescopes 55 KH #D 55 Kiruna Sweden 55 Perseus constellation 55 Rover Opportunity 55 orbiting spacecraft 55 Dumbbell Nebula 55 Huygens mission 55 Saturn moons Titan 55 AU Mic 55 moon Mimas 55 orbital resonance 55 Taurid 55 CARTOSAT 55 Wilkinson Microwave Anisotropy Probe 55 orbiting observatory 55 NASA Far Ultraviolet 55 Emily Lakdawalla 55 galactic cosmic rays 55 Total Ozone Mapping 55 probe Chang'e 55 Ocean Salinity 55 exo planets 55 LCROSS 55 Earth ionosphere 55 constellation Ursa Major 54 Martian dust 54 HiRISE 54 Saturn Enceladus 54 Deep Impact mission 54 Bullet Cluster 54 circumstellar disk 54 infrared wavelengths 54 Buehler Planetarium 54 spectrographs 54 Jovian moons 54 circumstellar disks 54 Wilkinson Microwave Probe 54 faint smudge 54 ESO telescopes 54 Mars landers 54 Neptune Uranus 54 HAT P 54 Envisat satellites 54 aurorae 54 Eagle Nebula 54 gamma rays emitted 54 Orion nebula 54 Spaceweather.com 54 Space Infrared Telescope 54 ESA Envisat satellite 54 TRMM 54 Martian orbit 54 lunar equator 54 Saturn outermost ring 54 HD# [002] 54 supergiant star 54 Sensing Satellite 54 gamma ray burst 54 astrophysical phenomena 54 photometry 54 rocky extrasolar planet 54 optical wavelengths 54 protons collide 54 CloudSat 54 Kuiper Belt Objects 54 moons orbiting Saturn 54 Halley Comet 54 Lyrids 54 SMOS 54 constellation Pegasus 54 Keck Telescope 54 intrinsic brightness 54 ionised gas 54 NEAR Shoemaker 54 spatially resolved 54 NASA Kepler spacecraft 54 Nasa Deep Impact 54 moonlet 54 TrES 4 54 Extrasolar Planet Observation 54 retroreflector 54 NASA Cassini orbiter 54 Cryosat 54 Composite Infrared Spectrometer 54 gamma ray spectrometer 54 reflection nebula 54 NASAâ € ™ 54 rover panoramic 54 IKAROS 54 Gamma rays 54 Cherenkov radiation 54 HIRES spectrometer 54 Foton spacecraft 54 sidereal 54 NASA Gamma ray 54 auroral 54 visible wavelengths 54 Deep Impact Extended 54 Cosmic Evolution 54 Enceladus flybys 54 Compact Reconnaissance Imaging Spectrometer 54 NASA Mars Reconnaissance 54 LCROSS Lunar Crater Observation 54 Cygnus X 54 planemos 54 submillimeter wavelengths 54 SpaceX Falcon 54 interferograms 54 spacecraft 54 Omega Centauri 54 J# +# [002] 54 outer corona 54 Orionid Meteor Shower 54 polar orbiting satellites 54 coronagraph 54 lunar surface 54 submillimetre wavelengths 54 blazar 54 S/# [001] 54 Hubble Space telescope 54 NanoSail D 54 Astrophysical 54 comet Boethin 54 Descent Imager Spectral Radiometer 54 Charon Pluto 54 silicate dust 54 orbiting Mars 54 Comet Hale Bopp 54 Exoplanets 54 star Proxima Centauri 54 gamma ray photons 54 Hubble observations 54 gamma ray emission 54 Gamma ray 54 spectroscopic measurements 54 transiting exoplanets 54 Viking Orbiter 54 Triangulum Galaxy 54 FORMOSAT 54 Syrtis Major 54 redshift z = 54 Kepler #b 54 XTE J# 54 aboard SpaceX Falcon 54 Beta Pictoris b 54 star Fomalhaut 54 KAGUYA 54 Apophis asteroid 54 icy comets 54 Program DMSP 54 planets orbits 54 X ray observatory 54 AKARI 54 MUSES C 54 gamma ray flares 54 Martian landscape 54 APXS 54 NASA rovers 54 Eridanus 54 orbiter Mars Odyssey 54 Imaging Spectrometer 54 ChemCam 54 redshifted 54 Anisotropy Probe WMAP 54 High Resolution Imaging 54 Cometary 54 SNe Ia 54 Sagittarius Window Eclipsing 54 refurbished Hubble Space 54 Gamma ray burst 54 constellation Serpens 54 geyser plumes 54 Astronomy buffs 54 gravitational lens 54 copper impactor 54 flyby Cassini 54 Andromeda galaxy 54 Submillimeter Array 54 NASA Spacecraft 54 dwarf spheroidal 54 cometary nucleus 54 infrared imagery 54 Oort cloud 54 LROC 54 THEMIS 54 impactor 54 AIRS instrument 54 NFIRE 54 QQ# 54 meteoroids 54 Encke gap 54 geoeffective 54 distant supernovae 54 Observatory STEREO 54 sundog 54 Sounder AIRS instrument 54 Solar Terrestrial Relations 54 Huygens Probe 54 thermal infrared 53 HiRISE camera aboard 53 planetary nebula 53 Coma Cluster 53 martian landscape 53 OrbView 53 Lunar Orbiter 53 Geminid Meteor Shower 53 polarimetric 53 Hubble telescope 53 Voorwerp 53 F#W 53 Hayabusa probe 53 magnetospheric 53 Spectroradiometer 53 thrilling stargazers 53 COROT 7b 53 infrared spectrometers 53 moon Enceladus 53 comets orbiting 53 Mini Thermal Emission 53 Saturn outermost 53 interstellar dust grains 53 WD5 53 EGRET 53 Triangulum 53 Field Planetary Camera 53 THEMIS Image 53 coronal mass ejection 53 lensing galaxy 53 accretion disks 53 Saturnian moons 53 axions 53 XMM Newton satellite 53 interplanetary spacecraft 53 Robotic Arm Camera 53 Meteosat 53 Curiosity rover 53 constellation Cygnus 53 Horizons spacecraft 53 GJ#b 53 Hubble Space 53 Venusian atmosphere 53 Evolution Explorer 53 orbit insertion 53 Kuiper belt objects 53 Philae lander 53 Hinode 53 zodiacal constellations 53 Infrared Thermal Imaging Spectrometer 53 Near Infrared Camera 53 helium atoms 53 visit http:/saturn.jpl.nasa.gov 53 NASA MESSENGER 53 NASA Landsat 53 exo planet 53 Cepheid variables 53 diffraction patterns 53 distant quasars 53 microscopic imager 53 ejecta 53 Proba 2 53 trans Neptunian objects 53 keV 53 Dynamics Observatory 53 Reflection Radiometer 53 submillimetre 53 Fomalhaut 53 particle beam 53 Galilean satellites 53 PSR B# 53 Extrasolar Planets 53 Hipparcos 53 gravitationally lensed 53 geoneutrinos 53 orbiting Cassini spacecraft 53 Itokawa 53 constellation Orion 53 Alycia Weinberger 53 hypersonic speeds 53 nightside 53 IRAS #-# 53 coronal holes 53 Servicing Mission 53 earthlike planets 53 situ measurements 53 NICMOS 53 Steins asteroid 53 Mars orbiters 53 cometary material 53 Landsat satellite 53 orbits 53 Meteor showers 53 Space Shuttle Atlantis 53 GLAST 53 NASA Stratospheric Observatory 53 Olympus Mons 53 Reiner Gamma 53 NASA ICESat 53 Advanced Microwave Scanning 53 Radar ASAR 53 Upsilon Andromedae b 53 Main Injector Neutrino 53 Chilean Atacama Desert 53 prograde 53 Martian equator 53 Jupiter moons 53 Astronomical Units 53 YORP effect 53 Laser Interferometer Gravitational Wave 53 millimeter wavelength 53 polar stratospheric 53 unmanned probes 53 Cassini orbiter 53 moon Charon 53 Huygens lander 53 planetary nebulae 53 Cydonia region 53 SPICAM 53 interstellar dust samples 53 sized planets orbiting 53 Mars Phobos 53 GOSAT 53 planetary transits 53 robotic rovers 53 Mercury magnetosphere 53 Herschel Space 53 wavelength infrared 53 Rosetta lander 53 weather satellite TIROS 53 Earthlike planets 53 Ontario Lacus 53 Ultraviolet Imaging Spectrograph 53 Leonid shower 53 sunlike stars 53 Meridiani plains 53 Lunar eclipse 53 Lunar Reconnaissance Orbiter Camera 53 Lutetia 53 imaging spectrometer 53 Mars orbiting spacecraft 53 constellation Pisces 53 Heterodyne Instrument 53 retrograde orbits 53 Magellanic Stream 53 satellites orbiting Earth 53 NASA Lunar Prospector 53 inhabitable planets 53 Comet Shoemaker Levy 53 constellation Gemini 53 Chang'eI 53 detect gravitational waves 53 Saturn outermost moon 53 Titan Saturn 53 APEX telescope 53 Gravitational lensing 53 telescopic observations 53 Muons 53 Type Ia supernova 53 Carina constellation 53 Leonids meteor shower 53 elliptical galaxy NGC 53 constellations planets 53 Delta Aquarids 53 orbiting telescope 53 astrometry 53 Herschel telescope 53 gamma ray radiation 52 Hubble Ultra 52 geomagnetic activity 52 ENAs 52 Itokawa asteroid 52 lunar crust 52 amateur skywatchers 52 Kuiper Belt Object 52 HARPS spectrograph attached 52 Martian rocks 52 distant galaxies 52 Infrared Astronomy SOFIA 52 Phoebe orbits 52 planets orbiting sun 52 planet HD #b 52 spectroscopic observations 52 orbiting Kepler telescope 52 Heliospheric Observatory 52 Stephan Quintet 52 Rick Grammier Deep Impact 52 Cassini Spacecraft 52 Mars Reconnaissance Orbiter 52 masers 52 attosecond 52 scatterometer 52 Cassini ion 52 planets circling 52 mammoth cosmic ray 52 moons circling 52 constellations Cygnus 52 Anisotropy Probe 52 Beehive Cluster 52 exhaust plume 52 manned Shenzhou 52 NROL 52 Arsia Mons 52 gravitational keyhole 52 Viking landers 52 Bonneville Crater