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(Click for frequent words.) 71 infrared observatory 68 telescope 67 HiRISE camera 65 Subaru telescope 64 optical telescope 64 gamma ray observatory 64 Subaru Telescope 64 radiotelescope 64 X ray telescope 64 Galileo spacecraft 63 infrared telescopes 63 X ray observatory 63 spacecraft Cassini 63 Keck telescopes 63 Evolution Explorer 63 NASA MESSENGER spacecraft 63 WISE telescope 63 WISE infrared 62 optical telescopes 62 Keck telescope 62 Keck Observatory 62 orbiting observatories 62 gaseous planet 62 Convection Rotation 62 XMM Newton 62 ESO VLT 62 Fermi telescope 62 planetary Transits 62 Infrared Astronomical Satellite 61 orbiting telescope 61 Keck Telescope 61 aperture telescope 61 Nasa spacecraft 61 Orbiter LRO 61 NASA Lunar Reconnaissance 61 WISE spacecraft 61 astronomical telescope 61 WMAP satellite 61 UKIRT 61 Telescope LSST 61 Herschel telescope 61 Kepler spacecraft 61 laser altimeter 60 ESA XMM Newton 60 COROT 60 X ray telescopes 60 orbiting observatory 60 Submillimeter Array 60 orbiting Hubble Space Telescope 60 impactor spacecraft 60 AKARI 60 Lunar Reconnaissance Orbiter LRO 60 microlensing 60 Fomalhaut b 60 Ulysses spacecraft 60 telescope atop Mauna 60 asteroid Itokawa 60 IBEX spacecraft 60 telescopes 60 Planck satellite 60 NASA Far Ultraviolet 60 Pan STARRS 60 Moon Mineralogy Mapper M3 59 Cassini Huygens 59 infrared astronomy 59 Orbiter MRO 59 SIRTF 59 ray Space Telescope 59 robotic explorer 59 distant quasar 59 Very Large Telescope 59 ROSAT 59 submillimetre 59 New Horizons spacecraft 59 GJ #b [002] 59 meter Keck telescopes 59 Keck Interferometer 59 Cloud Aerosol Lidar 59 Infrared Telescope UKIRT 59 GALEX 59 probe Huygens 59 Mars Reconnaissance Orbiter MRO 59 Galaxy Evolution 59 inch Samuel Oschin 59 Deep Impact probe 59 spacecraft orbiting 59 gamma ray telescope 59 Infrared Pathfinder Satellite 59 ESO telescope 59 Kuiper Belt object 59 Faulkes Telescope 59 ESO Paranal Observatory 59 irregularly shaped asteroid 59 Explorer WISE 58 NASA Cassini spacecraft 58 Planck spacecraft 58 radar altimeter 58 astronomical observatory 58 extrasolar planet 58 Solar TErrestrial RElations Observatory 58 Telescope BAT 58 Optical Gravitational Lensing Experiment 58 particle detector 58 Herschel Space 58 spacecraft 58 Epsilon Aurigae 58 retroreflector 58 ESA Planck 58 Cassini Huygens spacecraft 58 Aqua satellite 58 La Silla Observatory 58 Reconnaissance Orbiter 58 GRB #B 58 Nasa Mars Reconnaissance 58 Mars Odyssey spacecraft 58 Mossbauer spectrometer 58 Voyager spacecraft 58 imaging spectrometer 58 telescopic camera 57 Landsat satellite 57 Kepler Space Telescope 57 Observatory SDO 57 NASA Stardust spacecraft 57 photometer 57 spectrograph 57 Hayabusa spacecraft 57 Viking Lander 57 Samuel Oschin Telescope 57 SDSS telescope 57 Helios 2B 57 HiRISE camera aboard 57 Lunar CRater Observation 57 Hubble Space Telescope HST 57 TrES 4 57 HD#b 57 Infrared Telescope 57 Cancri e 57 AB Aurigae 57 SOHO spacecraft 57 gamma ray spectrometer 57 cosmic cannibal 57 X ray observatories 57 exoplanet hunter 57 infrared imager 57 Descent Imager Spectral Radiometer 57 Climate Experiment GRACE 57 Gemini telescopes 57 Mars Pathfinder lander 57 X ray spectrometer 57 Opportunity rover 57 telescopes astronomers 57 HARPS instrument 57 ESO Very Large Telescope 57 WM Keck Observatory 57 ESO telescopes 57 Array ALMA 57 orbiting Mars 57 smallest exoplanet 57 Messenger spacecraft 57 Hubble Telescope 57 GJ#b 57 APXS 57 Global Surveyor spacecraft 57 Planck telescope 57 Cassini flyby 57 LOFAR 57 CoRoT satellite 56 VISTA telescope 56 fainter objects 56 Burst Alert 56 IceCube 56 Mauna Kea Hawaii 56 neutrino detector 56 twin Voyager spacecraft 56 Spitzer Space Telescope 56 Context Camera 56 Nasa Kepler 56 HARPS spectrograph 56 Comet Lulin 56 Herschel Space Telescope 56 Hubble Space Telescope 56 ChemCam 56 Rosetta orbiter 56 TerraSAR X 56 neutrino particles 56 Anisotropy Probe 56 ESA Huygens probe 56 celestial object 56 THEMIS satellites 56 GRB # 56 Great Observatories 56 Alpha Particle 56 Huygens lander 56 Zeta Ophiuchi 56 Rosetta spacecraft 56 NASA Wilkinson Microwave 56 flyby spacecraft 56 meter Keck telescope 56 Keck Telescopes 56 spiral galaxy NGC 56 infrared spectrograph 56 orbiting gamma ray 56 EPOXI mission 56 SELENE 56 asteroid Lutetia 56 GOCE satellite 56 BepiColombo 56 Ocean Salinity SMOS 56 Hubble telescope 56 Earth orbiting satellites 56 GJ #b [001] 56 orbiting spacecraft 56 UVOT 56 Moderate Resolution Imaging 56 AU Mic 56 Anisotropy Probe WMAP 56 geoneutrinos 56 Palomar Observatory 56 neutrino telescope 56 NASA Stratospheric Observatory 56 transiting exoplanet 56 comet nucleus 56 High Resolution Imaging 56 distant supernovae 56 Sojourner rover 55 detect gravitational waves 55 Stratospheric Observatory 55 Viking landers 55 orbiting telescopes 55 Giovanni Cassini 55 neutrino detectors 55 Cassini spacecraft 55 Mars Orbiter Camera 55 Chilean Atacama Desert 55 Faint Object 55 Infrared Astronomy 55 Field Imager 55 orbiting Saturn 55 gamma ray burst 55 Saturnian moon Titan 55 astronomical telescopes 55 airborne observatory 55 SIM PlanetQuest 55 Cerro Paranal 55 Kaguya spacecraft 55 VIRTIS 55 Thermal Emission Spectrometer 55 THEMIS spacecraft 55 Martian crater 55 RHESSI 55 Martian lander 55 asteroid 55 Diviner instrument 55 NASA EPOXI mission 55 interferometer 55 NASA Infrared Telescope 55 COROT 7b 55 Southern Observatory ESO 55 DISR 55 BP Psc 55 Near Infrared Camera 55 Express orbiter 55 NASA Kepler spacecraft 55 Planetary Transits 55 NASA STEREO 55 orbiting Chandra 55 robotic telescopes 55 TanDEM X 55 Arecibo telescope 55 ESA SMART 55 submillimeter wavelength 55 MESSENGER spacecraft 55 hyperspectral 55 NuSTAR 55 optical infrared telescope 55 moon Charon 55 RXTE 55 LORRI 55 brightest supernova 55 Solar Dynamics Observatory 55 spacecraft Chandrayaan 1 55 TSN PZ camera 55 ENVISAT 55 Martian rovers 55 panoramic camera 55 Mini SAR 55 Mars rovers Spirit 55 Spectrograph 55 sunlike star 55 Hanny Voorwerp 54 constellation Cassiopeia 54 telescopic observations 54 NASA Interstellar Boundary 54 Science Experiment HiRISE 54 NFIRE satellite 54 Jodrell Bank Observatory 54 Comet Hartley 2 54 NASA Kepler 54 lunar orbiter 54 Gravitational lensing 54 polar orbiting satellites 54 Mission SRTM 54 comet flyby 54 hyperspectral imager 54 ROCSAT 2 54 PSR J# 54 Infrared Telescope Facility 54 Cerro Pachon 54 X ray Observatory 54 Spaceguard Survey 54 Space Telescope 54 Ranging spacecraft 54 G#.# +#.# 54 Wilkinson Microwave Anisotropy Probe 54 Cassini orbiter 54 Comet McNaught 54 exoplanetary 54 Phobos Grunt 54 OGLE TR #b 54 imager 54 submillimeter 54 gravitational microlensing 54 Telescope 54 Churyumov Gerasimenko 54 HiRISE image 54 robotic spacecraft 54 NASAs 54 stratospheric balloon 54 interplanetary spacecraft 54 Super Kamiokande 54 WASP #b 54 Omega Centauri 54 Mercury flyby 54 multiband imaging photometer 54 NASA Chandra 54 Paranal Chile 54 spacecraft orbited 54 Upsilon Andromedae b 54 Deep Field HUDF 54 STEREO spacecraft 54 Voyager probes 54 Interferometer VLTI 54 gamma ray detector 54 Reflection Radiometer 54 NASA THEMIS 54 Hinode spacecraft 54 Laser Interferometer Gravitational Wave 54 Kepler observatory 54 planets orbiting sun 54 ESA Integral 54 cosmic ray observatory 54 BLG #Lb 54 COSMO SkyMed 54 Resolution Imaging 54 moon Enceladus 54 Synthetic Aperture Radar 54 LROC 54 D CIXS 54 Observatory Very 54 Gravity Probe B 54 MARSIS radar 54 radio occultation 54 HIRES spectrometer 54 spectrometer 54 Kepler Telescope 54 HARPS spectrograph attached 54 Chajnantor plateau 54 particle smasher 54 XMM Newton satellite 54 Michibiki 54 Orion Nebula 54 Horizons spacecraft 54 YU# 54 GOCE 54 NASA ESA Hubble 54 Saturn Cassini 54 proto cluster 54 Observatory telescope 54 heaviest payloads 54 field Infrared Survey 54 orbiter Cassini 54 HRSC 54 Multi Object Spectrograph 54 comet Lulin 54 PSLV C6 54 planet HD #b 54 Suzaku X ray 54 lunar orbiters 54 hexagonal mirrors 54 Lunokhod 54 Butterfly Nebula 54 Corot 7b 54 moons orbiting 54 Fermi LAT 54 galaxy M# [001] 54 NASA twin STEREO 54 spectrographs 53 Kepler telescope 53 robotic rovers 53 gravitational lenses 53 KAGUYA 53 Voorwerp 53 lunar crust 53 MARSIS 53 Infrared Array Camera 53 Cosmic Background Explorer 53 SBSS satellite 53 Viking orbiters 53 Stardust spacecraft 53 Ariane rocket 53 exo planet 53 Giove B 53 Kuiper belt object 53 Envisat satellite 53 GRB# 53 Muchachos Observatory 53 ESO La Silla 53 CARTOSAT 53 orbiting 53 particle detectors 53 Mössbauer 53 Gemini Observatory 53 Bug Nebula 53 astronomical observatories 53 gigapixel camera 53 Very Large Array 53 Ultraviolet Imaging Spectrograph 53 astronomers 53 astronomer 53 ExoMars rover 53 microlensing events 53 Pierre Auger Observatory 53 X ray afterglow 53 SCISAT 53 Carnegie Observatories 53 asteroid Vesta 53 NASA twin rovers 53 occultations 53 comet 53 Mars Reconnaissance Orbiter 53 Titan Saturn 53 IKONOS 53 Pluto Charon 53 thermal infrared 53 Moon Mineralogy Mapper 53 WIYN 53 Jupiter flyby 53 interstellar particles 53 Wolszczan 53 satellite IKONOS 53 supergiant star 53 Ultraviolet Optical Telescope 53 Mars rover Opportunity 53 Gusev crater 53 interstellar dust samples 53 Spitzer infrared telescope 53 QuickBird 53 GEO# 53 gamma ray radiation 53 moon Titan 53 elliptical galaxy NGC 53 Kepler Mission 53 orbited Jupiter 53 SINFONI 53 constellation Eridanus 53 APEX telescope 53 remote sensing satellite 53 Planck observatory 53 Lulin 53 SN #C 53 ultraviolet spectrograph 53 Pan STARRS telescope 53 penetrating radar 53 Opportunity Mars rover 53 Proxima Centauri 53 Lunar Reconnaissance Orbiter Camera 53 foreground galaxy 53 Solar Optical Telescope 53 EPOXI spacecraft 53 millimeter wavelength 53 spiral galaxy Messier 53 NIRSpec 53 GIOVE B 53 Caltech Palomar Observatory 53 DEIMOS 53 Space Telescope GLAST 53 NEOWISE 53 lander rover 53 Gamma ray burst 53 Gliese #c 53 Adaptive Optics 53 radar altimetry 53 orbital rendezvous 53 Kuiper Belt Objects 53 infrared spectrometers 53 exhaust plume 53 neutron spectrometer 53 Nasa Mars Odyssey 53 Yinghuo 1 53 Mauna Loa Observatory 53 Saturnian moon 53 ESA Herschel 53 Area Telescope LAT 53 Orion nebula 53 NASA Great Observatories 53 gradiometer 52 stellar occultations 52 subsurface ocean 52 Gran Telescopio Canarias 52 NASA rover Spirit 52 eyepiece #/#s f/#.# 52 Hubble Space telescope 52 planets orbiting distant 52 spaceborne 52 Siding Spring 52 Advanced Spaceborne Thermal Emission 52 Saturnian system 52 optical microscope 52 H2A rocket 52 NASA Lunar Prospector 52 observatory 52 Space Infrared Telescope 52 Kibo module 52 La Silla observatory 52 ultraviolet imaging spectrograph 52 Comet 9P/Tempel 1 52 Comet Holmes 52 spectrometers 52 SN #gy 52 starburst galaxy 52 Wilkinson Microwave Probe 52 Mars moon Phobos 52 ESA Rosetta 52 airglow 52 impactor 52 P/# A2 52 Comet Machholz 52 Mars landers 52 Antennae Galaxies 52 SMOS Soil Moisture 52 Stardust capsule 52 Starfire Optical Range 52 galaxy NGC 52 Philae lander 52 HD #b [002] 52 distant galaxy 52 Titan flyby 52 MG J# +# 52 spectroscopic observations 52 Infrared Astronomical Satellite IRAS 52 asteroid Eros 52 microscopic imager 52 Robotic Arm Camera 52 NASA COBE satellite 52 Atacama Large Millimeter Array 52 synthetic aperture radar 52 Kuiper Belt Object 52 Martian surface 52 moon Io 52 Mars orbiting spacecraft 52 Observatory STEREO 52 Infrared Astronomy SOFIA 52 exoplanets orbiting 52 Gamma ray Large 52 spy satellites 52 Chang'eI 52 Foton M3 52 unmanned rover 52 geostationary satellite 52 Huygens probe 52 atop Mauna Kea 52 gravitational wave 52 planet Gliese #g 52 martian surface 52 E ELT 52 Saturn moon 52 orbiting Hubble telescope 52 pressurized module 52 extrasolar planets 52 NASA Cosmic Background 52 unmanned lunar orbiter 52 innermost planet 52 Sensing Satellite LCROSS 52 Resourcesat 2 52 THEMIS 52 cosmic microwave radiation 52 HiRISE 52 observatory telescope 52 Geminga 52 telescopes atop Mauna 52 Huygens spacecraft 52 spectroscopic 52 astronomical observations 52 Relations Observatory STEREO 52 periodic dimming 52 Oceansat 2 52 Viking Orbiter 52 Itokawa 52 Rosetta lander 52 JIMO 52 extrasolar 52 SeaWiFS 52 rover Opportunity 52 Arches Cluster 52 ESA Envisat 52 Thermal Emission Imaging 52 NASA Fermi Gamma 52 CBERS 52 Mini Thermal Emission 52 Boethin 52 Hinode 52 TU# [002] 52 X ray Telescope XRT 52 Hubble Space Telescopes 52 comet dust 52 RazakSAT 52 coronagraph 52 William Herschel Telescope 52 Spitzer infrared spectrograph 52 transiting planet 52 Paranal Observatory 52 HESS telescopes 52 comet McNaught 52 GeneSat 1 52 Extremely Large Telescope 52 Shackleton crater 52 SMOS 52 lunar surface 52 NEAR Shoemaker 52 KamLAND 52 Mossbauer 52 arcsecond 52 gravitational lens 52 Mandushev 52 CMB radiation 52 comet chaser 52 Cerro Pachón 52 Large Telescope 52 Eagle Nebula 52 Earthlike planets 52 Optical Spectroscopic 52 LCROSS mission 52 millisecond pulsar 52 Hinode satellite 51 Hellas Basin 51 distant galaxy clusters 51 Main Injector Neutrino 51 Auger Observatory 51 Lunar Prospector 51 distant galaxies 51 Paranal 51 NASA Lunar Crater 51 observatories 51 NASA Cassini 51 Saturn moon Enceladus 51 orbiting Kepler telescope 51 Foton spacecraft 51 Arecibo Observatory 51 astrometric 51 Comet Hartley 51 lunar explorer 51 lunar crater 51 Deep Impact flyby spacecraft 51 Cryosat 51 equatorial orbit 51 Curiosity rover 51 stellar occultation 51 COBE satellite 51 Apollo missions 51 satellites 51 radial velocity technique 51 visit http:/saturn.jpl.nasa.gov 51 Astrophysical Research 51 scramjet 51 NASA Mars Reconnaissance 51 Solar Orbiter 51 NEOSSat 51 moons Phobos 51 Mössbauer spectrometer 51 neutron detector 51 closest flyby 51 Reflection Radiometer ASTER 51 Comet Halley 51 Heterodyne Instrument 51 HUDF 51 protoplanet 51 CHIPSat 51 orbiter robotic arm 51 Global Surveyor 51 Mars Color Imager 51 Cygnus X 51 #P/Churyumov-Gerasimenko 51 meteoroid 51 Venusian atmosphere 51 Jovian moon 51 Cassini 51 Tarantula Nebula 51 RS Ophiuchi 51 Eta Carinae 51 transmission electron microscope 51 INSAT 4CR 51 Huygens 51 Lovell Telescope 51 Composite Infrared Spectrometer 51 Bonneville Crater 51 windshield wiper maneuver 51 KBOs 51 cosmological distances 51 X ray wavelengths 51 lunar orbiter Chang'e 51 Imaging Spectrometer 51 Jay Melosh 51 TecSAR 51 Jupiter Icy Moons 51 RS Oph 51 NASA Voyager spacecraft 51 radial velocity 51 CRISM 51 Astrophysics MOA 51 Stephan Quintet 51 Uninhabited Aerial Vehicle 51 orbiter lander 51 Centaur rocket 51 Mars CRISM 51 LCROSS Lunar Crater Observation 51 infrared wavelengths 51 interacting galaxies 51 entered lunar orbit 51 Solar Terrestrial Relations 51 Eric Becklin 51 martian landscape 51 barred spiral galaxy 51 THEMIS mission 51 exoplanet 51 LRO spacecraft 51 NASA Gamma ray 51 superlens 51 Virgo Cluster 51 Compact Reconnaissance Imaging Spectrometer 51 NASA Kepler telescope 51 INSAT 3D 51 Deep Impact spacecraft 51 arcminutes 51 astrometry 51 ESA Envisat satellite 51 NASA rover Opportunity 51 zodiacal light 51 Foton M2 51 Saturn magnetosphere 51 ALMA antennas 51 unmanned lunar 51 SDSS II 51 USArray 51 Solar Observatory 51 Planetary Fourier Spectrometer PFS 51 slender crescent 51 optical interferometry 51 Hayabusa probe 51 Ikonos 51 rover panoramic 51 celestial observations 51 Mars Opportunity rover 51 Resourcesat 51 MESSENGER MErcury Surface 51 supernova explosion 51 ESA Mars 51 Red Rectangle 51 planet Uranus 51 Skynet 5C 51 Mars Orbiter 51 Galactic cosmic rays 51 radial velocity method 51 twin rover Opportunity 51 WFC3 51 Galilean moons 51 MUSES C 51 Mars Pathfinder 51 gamma ray detectors 51 distant quasars 51 Thirty Meter Telescope 51 orbiter 51 Cassegrain telescope 51 interstellar dust particles 51 Lunar Reconnaissance Orbiter 51 ANI NASAs 51 LIGO 51 ejecta plume 51 exosphere 51 situ measurements 51 Cygnus Lyra region 51 lensing galaxy 51 cosmic magnifying glass 51 MicroFUN 51 Ranging MESSENGER spacecraft 51 supernova remnant 51 National Astronomical Observatory 51 Impact Probe MIP 51 Martian rover 51 amateur astronomers peering 51 constellation Hercules 51 Cassini ultraviolet 51 polarimeter 51 Epsilon Eridani 51 interferometers 51 Hubble 51 Deep Impact mission 51 remote sensing satellites 51 magma ocean 51 X ray binary 50 Lagoon Nebula 50 red supergiant 50 NIRCam 50 extrasolar planets orbiting 50 Kaguya 50 OSIRIS 50 Spacewatch 50 moon permanently shadowed 50 Neutral Mass Spectrometer 50 scramjet engine 50 Minotaur rocket 50 Surveys ACS 50 Virgo cluster 50 Kaguya probe 50 polarimetric 50 SDSS III 50 particle physics detector 50 Multi Object Spectrometer 50 UDFy # 50 Cosmic Origins Spectrograph 50 Proba 2 50 nanosatellite 50 planet orbiting 50 NASA Mars Odyssey 50 millisecond pulsars 50 Spitzer infrared 50 Endeavour docked 50 Jupiter Ganymede 50 twin STEREO spacecraft 50 Satellite Launch Vehicle 50 HD #b [001] 50 Spectrometer 50 galaxy M# [002] 50 submillimetre wavelengths 50 X ray detector 50 RISAT 50 Gravity Recovery 50 geo stationary orbit 50 polarimetry 50 DIXI 50 earthshine 50 Atacama Large Millimeter submillimeter 50 colliders 50 eclipsing binary 50 infrared camera 50 Kepler #b 50 Hobby Eberly Telescope 50 HiRISE images 50 Type Ia supernova 50 Antenna LISA 50 cosmic microwave background 50 MPG ESO 50 moon Phobos 50 Wide Angle Search 50 Coma Cluster 50 solar corona 50 subatomic particle 50 radiosondes 50 asteroid Steins 50 moon Mab 50 Facility SIRTF 50 nanosatellites 50 Ocean Salinity 50 Beta Pictoris b 50 Fermi Gamma ray 50 Sombrero Galaxy 50 Martian dust 50 infrared spectrometer 50 Ground penetrating radar 50 located atop Mauna 50 Pancam 50 refracting telescope 50 PASADENA Calif. NASA 50 spacecraft thrusters 50 Earth asteroid Itokawa 50 Syrtis Major 50 moon Ganymede 50 EPOCh 50 extragalactic 50 Arecibo radar 50 NASA Mars rover 50 dexterous robot 50 Olympus Mons 50 MetOp 50 Huygens mission 50 ANUSAT 50 Jupiter Icy Moons Orbiter 50 NASA Spirit rover 50 Kepler 9c 50 Charon Pluto 50 PSLV C# rocket 50 Satellite GOSAT 50 rover Sojourner 50 reflection nebula 50 orbiter Mars Odyssey 50 UCO Lick 50 Exoplanet 50 LAGEOS 50 Cat Paw Nebula 50 inch refractor telescope 50 lander 50 Synthetic Aperture Radar SAR 50 Image NASA JPL 50 protoplanetary 50 Andromeda Galaxy 50 SuperWASP 50 Chairman G Madhavan 50 AMSR E 50 NASA Opportunity rover 50 comet Hale Bopp 50 lunar perigee 50 satellites orbiting 50 binary quasar 50 Hubble Ultra 50 Observatory LIGO 50 Doppler measurements 50 NASA ICESat 50 volcanic moon Io 50 Extragalactic 50 Crab Nebula 50 Digitized Sky Survey 50 exoplanet orbiting 50 comet Churyumov Gerasimenko 50 HL Tau 50 rocky planets 50 spectrographic 50 SN #A 50 Recovery Experiment SRE 50 onboard Chandrayaan 50 Hubble observations 50 Gerard Kuiper 50 SOAR telescope 50 Cometary 50 super perigee moon 50 Flyby spacecraft 50 Lulin Observatory 50 electric ion propulsion 50 Itokawa asteroid 50 Magnetic Imager HMI 50 outermost planets 50 NFIRE 50 coronal loop 50 submillimeter wavelengths 50 Milky Way Galaxy 50 Insat 3A 50 waning gibbous 50 smallest extrasolar planet 50 EPOXI 50 cryogenically cooled 50 orbiting Cassini spacecraft 50 revolutionized astronomy 50 elliptical galaxy 50 Martian soil 50 radar interferometry 50 unmanned probes 50 Comet Hale Bopp 50 suborbital rocket 50 Delta Cephei 50 jagged ridge 50 CubeSats 50 robotic submarine 50 interferometric 50 detect gamma rays 50 Active Galactic Nuclei 50 Triangulum Galaxy 50 Andromeda galaxy 50 ringed planet 50 Gliese #e 50 ICESat 50 spectroscope 50 geosynchronous satellite 50 adaptive optics 50 Jupiter moon Io 50 Adam Riess 50 Orbiting Carbon Observatory 50 NASA LCROSS 50 moons Europa 50 GROND 50 interstellar dust grains 50 jovian 50 Atlas 2AS 50 CloudSat 50 satellites orbiting Earth 50 CU Boulder LASP 50 SCIAMACHY 50 HIAPER 50 Mini TES 50 Mars orbiter 50 ESA ASI 50 JWST