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(Click for frequent words.) 64 Galileo spacecraft 64 orbiting observatories 64 Kepler 9c 63 comets orbiting 63 Corot 7b 63 planetary Transits 62 Planetary Transits 62 Gamma ray burst 62 Nasa spacecraft 62 Comet Halley 62 Galilean moons 62 spacecraft flyby 62 BLG #Lb 62 moon Io 62 Evolution Explorer 62 exo planet 61 retrograde orbit 61 HD#b 61 sized planets orbiting 61 Uranus Neptune 61 Churyumov Gerasimenko 61 gamma ray observatory 61 gaseous planet 61 COROT 7b 60 Fermi telescope 60 transiting exoplanet 60 comet Churyumov Gerasimenko 60 OGLE TR #b 60 Cancri e 60 moons Phobos 60 volcanic moon Io 60 Giovanni Cassini 60 Composite Infrared Spectrometer 60 WMAP satellite 60 whiz harmlessly 60 innermost planet 60 Pluto Charon 60 NASA Wilkinson Microwave 60 Io Europa 60 Jupiter Ganymede 60 NASA Voyager spacecraft 60 Comet Hartley 2 60 MG J# +# 60 Fomalhaut b 60 Saturn Cassini 60 Deep Impact eXtended Investigation 60 orbiting Mars 59 exoplanetary 59 Geminga 59 Saturn Enceladus 59 moons circling 59 spacecraft Cassini 59 Relations Observatory STEREO 59 retrograde orbits 59 Hyakutake 59 NASA ICESat 59 Titan smoggy 59 Svedhem 59 Toutatis 59 Upsilon Andromedae b 59 CoRoT #b 59 Upsilon Andromedae 59 Mössbauer 59 Solar TErrestrial RElations Observatory 59 Cassini flyby 59 occultations 59 rocky extrasolar planet 59 Infrared Pathfinder Satellite 59 spacecraft orbited 59 Earth magnetotail 59 hunting Kepler telescope 59 Epsilon Eridani 58 asteroid Steins 58 smallest exoplanet 58 subsurface ocean 58 Comet #P/Churyumov-Gerasimenko 58 closest flyby 58 radio occultation 58 telescopic observations 58 Descent Imager Spectral Radiometer 58 Saturnian moon Titan 58 ESA Rosetta 58 Wilkinson Microwave Probe 58 Venusian atmosphere 58 sunlike star 58 Phoebe orbits 58 Kuiper belt object 58 Neptune Uranus 58 Samuel Oschin Telescope 58 Cassini Huygens 58 Planck spacecraft 58 EPOXI spacecraft 58 Convection Rotation 58 Mercury flyby 58 jovian 58 Elenin 58 inhabitable planets 58 Lunar Prospector 58 Optical Spectroscopic 58 exoplanets planets 58 moons orbiting 58 planet Gliese #g 58 Corot 9b 58 CoRoT 9b 58 cosmic cannibal 58 interstellar particles 58 cometary dust 58 neutral mass spectrometer 58 extrasolar 58 Gliese #G 57 particle analyzers 57 NEAR Shoemaker 57 PSR J# 57 Jupiter moons 57 GJ#b 57 NASA Cassini 57 Ranging spacecraft 57 constellation Carina 57 Muchachos Observatory 57 Cassini flybys 57 Express orbiter 57 highly elliptical orbit 57 XMM Newton X ray 57 comet McNaught 57 dimming starlight 57 NASA MESSENGER spacecraft 57 NASA twin STEREO 57 Titan flyby 57 smallest exoplanets 57 NASA EPOXI mission 57 Viking landers 57 Saturn Uranus Neptune 57 protoplanet 57 Cosmic Microwave Background 57 Rosetta spacecraft 57 Crab pulsar 57 magnetospheric 57 planets orbiting sun 57 Mandushev 57 galaxy M# [001] 57 moon Ganymede 57 amateur astronomers peering 57 Lunar Reconnaissance 57 RHESSI 57 WISE spacecraft 57 Comet Churyumov Gerasimenko 57 extrasolar planetary systems 57 exosphere 57 COROT 57 Viking Orbiter 57 visit http:/saturn.jpl.nasa.gov 57 comet Wild 57 HiRISE camera aboard 57 Hubble Space Telescope HST 57 Cygnus Lyra region 57 Huygens descent 56 Shuttle Atlantis blasts 56 largest moon Charon 56 Hubble orbits 56 mu Arae 56 elongated orbits 56 entered lunar orbit 56 protoplanetary 56 comet flyby 56 Uranus Jupiter 56 INTEGRAL satellite 56 Kuiper Belt Object 56 #P/Churyumov-Gerasimenko 56 IBEX spacecraft 56 Gliese #c 56 Ionospheric Sounding 56 airglow 56 Galilean satellites 56 stellar occultations 56 discover Fomalhaut 56 Cosmic Background Explorer 56 celestial observations 56 orbiting gamma ray 56 GLAST telescope 56 Mercury magnetosphere 56 Jupiter moon Io 56 Comet 9P/Tempel 1 56 CoRoT 7b 56 moons orbiting Saturn 56 VIRTIS 56 distant supernovae 56 stellar occultation 56 cosmic rays collide 56 SIM PlanetQuest 56 Swift Tuttle 56 Rosetta orbiter 56 spacecraft Chandrayaan 1 56 Ulysses spacecraft 56 enters lunar orbit 56 BepiColombo 56 ARRL AMSAT 56 interstellar dust grains 56 outer corona 56 WASP #b 56 thrilling stargazers 56 HARPS spectrograph attached 56 Astrological lore 56 Kepler #b 56 airborne particles affect 56 Martian rovers 56 WISE telescope 56 Mars moon Phobos 56 Saturn moons Enceladus 56 millisecond pulsar 56 exo planets 56 multiband imaging photometer 56 Saturnian moon 56 outer planets 56 planet Uranus 56 Galaxy Evolution 56 proton proton 56 Ultraviolet Imaging Spectrograph UVIS 56 gamma ray observatories 56 icy moons 56 Beta Pictoris b 56 trans Neptunian objects 56 Taurus Littrow Valley 56 Franck Marchis 56 XMM Newton 56 Ranging MESSENGER spacecraft 56 proton antiproton 56 Mars Phobos 56 constellation Hercules 56 submillimeter wavelengths 56 irregularly shaped asteroid 55 Anisotropy Probe 55 asteroid Eros 55 Muons 55 magnetic dynamo 55 moon Mab 55 Comet Hartley 55 Heliospheric Observatory SOHO 55 Kuiper belt objects 55 Neptune Jupiter 55 X ray telescopes 55 ESA Planck 55 Cassini Huygens spacecraft 55 asteroids orbiting 55 proto cluster 55 Cloud Aerosol Lidar 55 Kuiper Belt object 55 spatially resolved 55 THEMIS satellites 55 Mars Pathfinder lander 55 Martian moons Phobos 55 Moderate Resolution Imaging 55 buckypaper virtually 55 waning gibbous 55 comets meteors 55 submillimeter galaxies 55 Orbiter MRO 55 P Churyumov Gerasimenko 55 Greenbelt Md. manages 55 orbital solitude 55 spectrographs 55 NASA twin rovers 55 Kuiper Belt Objects 55 CoRoT satellite 55 exoplanets orbiting 55 ESA Huygens probe 55 lunar crust 55 Charon Pluto 55 Anisotropy Probe WMAP 55 moon Phobos 55 orbital insertion 55 Huygens mission 55 Infrared Array Camera 55 Mars Color Imager 55 cosmic ray flux 55 Jovian moon 55 distant supernovas 55 intrinsic brightness 55 Virgo Cluster 55 TSN PZ camera 55 meteoritic material 55 HESS telescopes 55 Comet Lulin 55 martian atmosphere 55 comets asteroids 55 Krimigis 55 Suzaku X ray 55 millisecond pulsars 55 Ring Nebula 55 planets Uranus 55 supernovae explode 55 gravitational lenses 55 orbital eccentricity 55 electron orbits 55 Steins asteroid 55 orbiting Saturn 55 starquakes 55 heliospheric 55 Mars Neptune Uranus 55 orbital resonance 55 submillimetre 55 Flyby spacecraft 55 polarimetry 55 GJ #b [002] 55 twin STEREO spacecraft 55 GALEX 55 ESA Integral 55 planemos 55 muon neutrinos 55 Tempel Tuttle 55 KBOs 55 YOUR HOROSCOPE 55 radial velocity technique 55 Observatory STEREO 55 axial tilt 55 van Arkel discovery 55 elongated orbit 55 twin Voyager spacecraft 55 Zeta Ophiuchi 55 Gerhard Schwehm 54 imaging spectrometer 54 Kepler Space Telescope 54 comet dust 54 MESSENGER MErcury Surface 54 NASA Lunar Prospector 54 SN #A 54 radial velocity 54 Gravitational waves 54 repeated fly bys 54 gravitational microlensing 54 Venusian 54 Shoemaker Levy 54 particle acceleration 54 GQ Lupi 54 NASA Cassini spacecraft 54 planets orbits 54 comet #P/Churyumov-Gerasimenko 54 cometary debris 54 substorm 54 Jovian moons 54 windshield wiper maneuver 54 Spitzer infrared telescope 54 comet Tempel Tuttle 54 Cassini Image 54 distant quasars 54 Optical Gravitational Lensing Experiment 54 Saturnian 54 Jupiter flyby 54 magnetotail 54 Hubble Near Infrared 54 Chilean Atacama Desert 54 X ray observatory 54 VIRTIS instrument 54 Saturn moon Mimas 54 Wide Angle Search 54 extrasolar planet 54 ESA Herschel 54 Ringed Planet 54 Io Europa Ganymede 54 Neutron Spectrometer 54 planets comets 54 Mars Uranus 54 solar corona 54 Space ENvironment GEochemistry 54 located atop Mauna 54 SPICAM 54 NASA THEMIS 54 APXS 54 Gliese #e 54 Planetary Fourier Spectrometer PFS 54 MESSENGER spacecraft 54 THEMIS spacecraft 54 moonquakes 54 emit X rays 54 Earthlike planets 54 Jupiter icy moons 54 Quaoar 54 smoothest flattest spot 54 GA6 54 Bug Nebula 54 SINFONI 54 Ian McShane Pillars 54 Tod Strohmayer 54 moons orbiting Pluto 54 astrometric 54 interplanetary spacecraft 54 planets atmospheres 54 Thermal Emission Spectrometer 54 TrES 4 54 Nasa Mars Odyssey 54 ESA ASI 54 prograde 54 axions 54 PSR B# 54 Higgs bosons 54 X ray binaries 54 outermost planet 54 Nikku Madhusudhan 54 Keck telescopes 54 asteroid Itokawa 54 Deep Impact comet 54 moons Europa 54 geoneutrinos 54 Mars Reconnaissance Orbiter MRO 54 foreground galaxy 54 Kazantzidis 54 NASA Far Ultraviolet 54 Saturnian system 54 GJ #b [001] 54 spectroscopically 54 Europa Ganymede 54 Magellanic Stream 54 muon neutrino 54 Itokawa asteroid 54 Perseus Cluster 54 ESA SMART 54 Henize #-# 54 aboard Taurus XL 54 Saturn equinox 54 Neutral Mass Spectrometer 54 VY Canis Majoris 54 electrons positrons 54 Cassini orbiter 54 Yinghuo 1 54 Fermi LAT 54 Mössbauer spectrometer 54 Martian meteorites 54 planetary embryos 54 detect gamma rays 54 Mercury Uranus 54 Rosetta lander 54 flyby Cassini 54 AU Mic 54 Heterodyne Instrument 54 galactic cosmic rays 54 Heliospheric Observatory 54 planetary magnetospheres 54 Mars rovers Opportunity 54 absorbs photons 54 orbiting Hubble Space Telescope 54 HD #b [002] 54 ray Space Telescope 54 HARPS instrument 54 Stephan Quintet 53 Hesperian epoch 53 planet HD #b 53 NICMOS observations 53 orbiter Cassini 53 DISR 53 red supergiant 53 lunar craters 53 XMM Newton satellite 53 galactic mergers 53 X ray afterglow 53 lunar orbiting spacecraft 53 VLBA observations 53 outermost planets 53 planetary astronomer 53 ESA Mars 53 AB Aurigae 53 ecliptic plane 53 Observatoire de Paris 53 Ocean Salinity SMOS 53 gaseous planets 53 reionization 53 gravitational wave 53 GRB #B 53 Deep Impact Extended 53 Gravitational lensing 53 journal Icarus 53 Peter Jenniskens 53 Earth magnetosphere 53 magnetic monopoles 53 Proxima Centauri 53 Venus Neptune Uranus 53 synchronous polar 53 retroreflector 53 High Accuracy Radial 53 brightest supernova 53 lunar occultation 53 Mars CRISM 53 HD #b [001] 53 NASA MErcury Surface 53 cosmic phenomena 53 Fermi Telescope 53 WISE infrared 53 Cassini 53 interstellar cloud 53 Pluto Eris 53 constellation Pegasus 53 moon Deimos 53 Explorer WISE 53 Magellanic Clouds 53 Alpha Particle 53 NASA Stardust spacecraft 53 Scientists theorized 53 assumed planets circling 53 Moon Mineralogy Mapper M3 53 galaxy cluster 53 orbiting Kepler telescope 53 Cassini spacecraft orbiting 53 ah dus 53 Wilkinson Microwave Anisotropy Probe 53 Galactic cosmic rays 53 rover Opportunity 53 Cometary 53 elliptical orbits 53 Hubble observations 53 journal Meteoritics 53 perihelion 53 asteroidal 53 supersymmetric particles 53 Alfvén waves 53 Lunar Reconnaissance Orbiter LRO 53 LAGEOS 53 Microlensing 53 RRATs 53 Planck satellite 53 Fashion Movie Reviews 53 Science Experiment HiRISE 53 Orbiter LRO 53 filamentary structure 53 geyser plumes 53 periodic dimming 53 Multi Object Spectrometer 53 rover Spirit landed 53 antineutrinos 53 astrophysical phenomena 53 interstellar dust particles 53 Lander robotic arm 53 Space Environment Geochemistry 53 infrared telescope 53 orbits Saturn 53 Image NASA JPL 53 SCIAMACHY 53 GRACE satellites 53 Comet #P 53 gravitationally lensed 53 reconnaissance orbiter 53 Mars orbiter 53 Wolszczan 53 Imaging Spectrometer 53 comet chaser 53 HiRISE camera 53 spectroscopic 53 spacecraft orbiting 53 eyepiece #/#s f/#.# 53 Gerard Kuiper 53 extragalactic 53 NASA LCROSS 53 NASA rovers Spirit 53 Avishay Gal Yam 53 Mars Odyssey mission 53 Near Infrared Camera 53 Bonnie Buratti 53 cosmological distances 53 superstrings 53 JILA joint 53 comet nucleus 53 P/# A2 53 Konacki 53 Comet Hale Bopp 53 rotational axis 53 outer heliosphere 53 electrons protons 53 Foton M3 53 ESA ERS 53 Mini Thermal Emission 53 Hale Bopp 53 magma ocean 53 Keck Interferometer 53 distant quasar 53 Enceladus flybys 53 Chandra Observatory 53 KT extinction 53 X ray binary 53 rotating neutron stars 53 HIRES spectrometer 53 Total Ozone Mapping 53 IRAS #-# 53 detect gravitational waves 53 planetary transits 52 Michael Zolensky 52 ultracold temperatures 52 X ray pulses 52 hydroxyl molecules 52 geomicrobiology studying particles 52 robotic explorers 52 Coma Cluster 52 Cassini Huygens Mission 52 neutron spectrometer 52 planets moons 52 Lulin Observatory 52 Gliese #d 52 Astronauts inspect 52 microlensing events 52 robotic explorer 52 interacting galaxies 52 Climate Sounder 52 Giovanni Schiaparelli 52 ultraviolet imaging spectrograph 52 planetary conjunctions 52 Mars Uranus Neptune 52 twin Viking landers 52 awarded manned spaceship 52 mesosphere 52 protoplanets 52 choking irritants 52 circular orbits 52 planet gravitational tug 52 Oort cloud 52 Saturn Jupiter Uranus 52 ESO telescopes 52 Saturn Uranus 52 La Silla observatory 52 Saturn moon 52 solar nebula 52 Son Nghiem 52 cosmological observations 52 NASA WMAP 52 Titan flybys 52 joins rovers Spirit 52 submillimeter wavelength 52 mere fly bys 52 Voyager spacecraft 52 sun corona 52 Dikpati 52 ESA Cluster 52 lunar orbiters 52 lunar perigee 52 planet orbits 52 planets orbiting distant 52 cometary material 52 Interior Laboratory GRAIL 52 Reflection Radiometer 52 Saturn rings 52 Chajnantor plateau 52 shepherding spacecraft 52 blazar 52 Martian terrain 52 extrasolar planets 52 mysterious uncharted 52 Jonathan Lunine 52 femtosecond timescale 52 moons Io Europa Ganymede 52 large hadron collider 52 gamma ray spectrometer 52 ESA XMM Newton 52 Infrared Astronomical Satellite IRAS 52 Comet Tempel Tuttle 52 infrared observatory 52 infrared ultraviolet 52 geo synchronous transfer 52 Shallow Subsurface Radar 52 ExoMars rover 52 Solar Dynamics Observatory 52 ESO VLT 52 gamma rays emitted 52 Delta Cephei 52 RXTE 52 Mars Jupiter Uranus 52 cosmic particles 52 interstellar dust samples 52 Adam Riess 52 starburst galaxy 52 Huygens spacecraft 52 Herschel Space 52 Caltech manages 52 carbonaceous chondrites 52 Helix Nebula 52 nightglow 52 YORP effect 52 submillimetre wavelengths 52 geo synchronous 52 Messenger spacecraft 52 magnetic substorms 52 MARSIS radar 52 magnetic polarity 52 OMEGA instrument 52 frozen sunless 52 highly elliptical orbits 52 inch Samuel Oschin 52 icy comets 52 Jack Lissauer 52 Astrophysics MOA 52 asteroid collisions 52 dwarf spheroidal 52 Jupiter magnetosphere 52 microlensing technique 52 Keck telescope 52 giant gaseous planets 52 MARSIS instrument 52 Aqua satellite 52 proprietary nanofabrication 52 spiral galaxy NGC 52 sterile neutrino 52 Saturn outermost moon 52 gravitational anomalies 52 Syrtis Major 52 THEMIS Images 52 laser altimeter 52 V# Mon 52 galactic disk 52 Ocean Salinity 52 STEREO spacecraft 52 BP Piscium 52 Climate Experiment GRACE 52 Herschel Space Telescope 52 orbiting Chandra 52 Cassini imaging 52 Orion nebula 52 emits X rays 52 galaxy M# [002] 52 zodiacal dust 52 moonlet 52 helium atom 52 Cepheid variables 52 waitress Ingrid Sufan 52 dustier stormier atmosphere 52 Epsilon Aurigae 52 impactor spacecraft 52 constellation Virgo 52 Marchis 52 cosmic microwave radiation 52 planets circling stars 52 planetary orbits 52 launching Andrian Nikolayev 52 planetoid 52 spectroscopic observations 52 planet HD#b 52 Voyager Galileo 52 ultraviolet wavelengths 52 accretion disks 52 Foton spacecraft 52 blue supergiant 52 moon Charon 52 hypervelocity star 52 copper impactor 52 Lunokhod 52 coronal loops 52 ULP cepheids 52 BBSNews #-#-# NASA 52 Carina constellation 52 Mars northern latitudes 52 Antiope 52 Dutch astronomer Christiaan 52 Planck observatory 52 Volatile Evolution 52 http:/saturn.jpl.nasa.gov 52 NASA Solar Terrestrial 52 lunar meteorites 52 X ray observatories 52 constellation Eridanus 52 mineralogical mapping 52 Multi Object Spectrograph 52 stellar seismology 52 Crab Pulsar 52 Noguchi greeting 52 solar prominences 52 Manned missions 52 Spitzer Space Telescopes 52 comet 51 Haumea 51 Saturnian moons 51 APEX telescope 51 gravitational interaction 51 Mars Orbiter 51 Phoenix Microscopy Electrochemistry 51 Magnetospheric 51 slender crescent 51 Jean Pierre Bibring 51 transiting exoplanets 51 silicate dust 51 UVIS instrument 51 Earth radii 51 Pieter van Dokkum 51 sunlike stars 51 lightweight synthetic aperture 51 Curiosity rover 51 Mars orbiting spacecraft 51 tholins 51 Infrared Thermal Imaging Spectrometer 51 UKIRT 51 ringed planet 51 Huygens lander 51 Meen Rashi 51 axis wobbles 51 Mission SRTM 51 comet particles 51 lunar meteorite 51 Kepler spacecraft 51 HD# [002] 51 Compton Gamma Ray 51 Comet Tempel 1 51 thin crescent 51 Nasa Kepler 51 Sagittarius dwarf galaxy 51 Sputnik beeped 51 GEochemistry 51 reionization epoch 51 gravitational keyhole 51 NASA STEREO 51 spectral measurements 51 astrophysical 51 Spectroscopic Explorer 51 interstellar dust 51 NASA Landsat 51 Foton M2 51 GOCE 51 cometary 51 Brownian particles 51 Halley comet 51 ESA GOCE 51 ionized particles 51 microlensing 51 cosmic rays 51 X ray spectrometer 51 Global Surveyor spacecraft 51 Jupiter Icy Moons 51 Viking orbiters 51 luminous galaxies 51 gibbous 51 Trojan asteroids 51 Cassini ultraviolet 51 JPL manages 51 QQ# 51 neutrino particles 51 Philae lander 51 Anthony Remijan 51 Manchester Jodrell Bank 51 Observatory SDO 51 Meridiani plains 51 Kailash Sahu 51 lunar equator 51 Seyfert galaxies 51 Europa Orbiter 51 dynamical evolution 51 extrasolar worlds 51 Magnetars 51 Atlantis undocks 51 Mercury exosphere 51 protostar 51 #gy 51 Comet Machholz 51 sidereal 51 EPOCh 51 SOHO spacecraft 51 lander rover 51 X ray spectra 51 NASA satellites orbiting 51 supergiant star 51 cosmic ray collisions 51 THEMIS Image 51 planets asteroids 51 Investigation DIXI 51 photochemical reactions 51 celestial sphere 51 celestial phenomena 51 Phaethon 51 Microscopy Electrochemistry 51 orbiting Mars Odyssey 51 galaxy redshift 51 Advanced Synthetic Aperture 51 planet magnetosphere 51 Big Bang atom smasher 51 infrared spectroscopic 51 Pluto dwarf 51 BLG #L 51 rocket lunar orbiter 51 Earth orbiting satellites 51 coronal holes 51 lunar orbits 51 NASA Spacecraft 51 LRO spacecraft 51 Tharsis Rise 51 Hayabusa spacecraft 51 astronomical telescope 51 protoplanetary disk 51 rotating neutron 51 carbonaceous chondrite 51 Director Charles Elachi 51 backscattered 51 reentry capsule 51 Nikon D# Kowa 51 hydrogen nuclei 51 Nasa Deep Impact 51 HL Tau 51 Sojourner rover 51 infrared spectrograph 51 COBE satellite 51 Brookhaven Relativistic Heavy 51 orbits 51 Yarkovsky effect 51 Coma cluster 51 Comet Holmes 51 CMB radiation 51 Phobos Grunt 51 unmanned probes 51 antiproton 51 photosphere 51 piggybacked Huygens probe 51 D CIXS 51 occulted 51 Eridanus 51 Sasselov 51 RPWS 51 magnetic monopole 51 Mars Pathfinder 51 Greenhouse gases trap 51 PSR B# +# 51 Mars Odyssey spacecraft 51 constellation Lacerta 51 radial velocity method 51 Earthly contamination 51 turned mutant superheroes 51 Saturn outermost 51 accelerator mass spectrometry 51 binary asteroid 51 antihelium 51 Telescope BAT 51 active volcanism 51 UDFy # 51 KH #D 51 baryonic 51 EPOXI mission 51 cosmic microwave background 51 Gamma ray bursts 51 gravitational tides 51 exoplanet 51 photochemistry 51 asteroid Vesta 51 moon Enceladus 51 Martian rocks 51 orbital inclination 51 X ray wavelengths 51 Libra adore 51 neutralinos 51 proton antiproton collisions 51 Saturn moon Enceladus 51 orbital radius 51 Ionosphere Sounding 51 Spitzer Space Telescope 51 situ measurements 51 Resolution Stereo Camera 51 microquasar 51 tau neutrino 51 magnetic reconnection 51 Stardust spacecraft 51 SeaWiFS 51 Enceladus flyby 51 Earth Connection Coronal 51 Extrasolar Planet Observation 51 Cassini Equinox 51 Opportunity parachuted 51 Lunar eclipses occur 51 planetary 51 distant galaxy 51 XTE J# 51 Itokawa 51 Infrared Astronomy 51 Tevatron collider 51 Jenniskens 51 supervolcanoes 51 observing satellites 51 systems EW suites 51 comets moons 51 High Resolution Imaging 50 NASAs 50 relativistic particles 50 Shuttle Discovery docks 50 Larry Soderblom 50 Sagittarius B2 50 Nasa Mars Reconnaissance 50 interstellar dust clouds 50 NASA orbiters circling 50 Milky Way halo 50 supergiant stars 50 auroral activity 50 dimensional atlas 50 planetary nebulas 50 galaxies collide 50 comet Hartley 2 50 amateur skywatchers 50 Dominique Cassini 50 radial velocity measurements 50 magnetospheres 50 radar interferometry 50 astronomers 50 Francis Halzen 50 millimeter wavelengths 50 X ray Timing 50 Comet Encke 50 Apophis asteroid 50 supernova explosion 50 TEGA ovens 50 astronomical observations 50 NASA Cosmic Background 50 robotic geologists 50 Particle acceleration 50 Envisat satellite