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(Click for frequent words.) 72 Planetary Camera 2 68 Cosmic Origins Spectrograph 67 Multi Object Spectrometer 66 fainter objects 66 Context Camera 65 Hubble Ultra 65 Explorer WISE 65 Hubble Space Telescope HST 65 WFPC2 64 Cosmic Origins Spectrograph COS 64 GALEX 64 NICMOS 64 Field Planetary Camera 64 arcminutes 63 Near Infrared Camera 63 VIRTIS 63 SINFONI 63 Spectrograph 63 XMM Newton 62 NASA Wilkinson Microwave 62 High Resolution Imaging 62 COROT 62 ESO VLT 62 HiRISE camera 62 orbiting Hubble Space Telescope 62 Pancam 62 Keck Interferometer 61 Lunar Reconnaissance Orbiter LRO 61 AKARI 61 Orbiter MRO 61 infrared wavelengths 61 visible wavelengths 61 photometer 61 LROC 61 laser altimeter 61 spectral bands 61 #x magnification [002] 61 ESA SMART 60 Mastcam 60 multispectral 60 Surveys ACS 60 Servicing Mission 60 spectrographs 60 Mössbauer 60 Narrow Angle 60 Multi Object Spectrograph 60 Descent Imager Spectral Radiometer 60 Comet Hartley 60 infrared astronomy 60 millimeter wavelengths 60 VISTA telescope 60 Adaptive optics 60 MG J# +# 60 spectroscopic observations 59 Rosetta orbiter 59 Convection Rotation 59 gamma ray observatory 59 Infrared Array Camera 59 THEMIS 59 astrometric 59 UVOT 59 Lunar Reconnaissance Orbiter Camera 59 pointings 59 Orbiter LRO 59 STEREO spacecraft 59 Field Imager 59 F#W 59 SIRTF 59 fluorescence microscope 59 STIS 59 Mars Color Imager 59 MPG ESO 59 orbiting gamma ray 59 Solar TErrestrial RElations Observatory 59 Fermi telescope 59 polarimetry 59 LORRI 59 Science Experiment HiRISE 59 Resolution Imaging 59 SMOS 59 hyperspectral 59 GOCE 59 retroreflector 58 CARTOSAT 58 microlensing events 58 NuSTAR 58 ESO PR 58 CCD camera 58 Resourcesat 58 ultraviolet spectrograph 58 Spitzer Infrared Array 58 Envisat satellites 58 polarimetric 58 EVLA 58 Lunar Orbiter 58 coronagraph 58 submillimetre wavelengths 58 planetary Transits 58 neutral mass spectrometer 58 Mars Orbiter 58 wavelength infrared 58 Faint Object 58 optical wavelengths 58 WISE infrared 58 Relations Observatory STEREO 58 Solar Terrestrial Relations 58 KODAK CCD Image Sensors 58 aboard ESA Envisat 58 Hubble telescope 58 spacecraft orbiting 58 multiwavelength 58 HRTEM 58 submillimeter wavelengths 58 UKIRT 58 X ray observatory 58 ChemCam 58 infrared imager 58 imaging spectrometer 58 radiometers 58 Hubble observations 57 exoplanetary 57 EPOCh 57 Galileo spacecraft 57 hyperspectral imager 57 Imaging Spectrometer 57 NASA ESA Hubble 57 Cartosat 57 infrared telescopes 57 Evolution Explorer 57 HUDF 57 Rosetta spacecraft 57 ESA XMM Newton 57 hyper spectral 57 infrared wavelength 57 Landsat 57 ARGUS IS 57 Hubble Near Infrared 57 ray Space Telescope 57 Keck telescopes 57 Ultra Deep 57 Magnetic Imager HMI 57 interferometric 57 orbiting observatories 57 JWST 57 NASA Cassini spacecraft 57 Lunar Orbiter Laser Altimeter 57 Mars Reconnaissance Orbiter MRO 57 airglow 57 Kepler Mission 57 Anisotropy Probe WMAP 57 Venusian surface 57 adaptive optics 57 photometry 57 detect gamma rays 57 KBOs 57 TanDEM X 57 infrared spectrometers 57 DigitalGlobe WorldView 57 redshifts 57 Mars CRISM 57 Burst Alert 57 AMIE camera 57 ESA Planck 57 Lunokhod 57 X ray telescopes 57 Synthetic Aperture Radar SAR 57 Thermal Emission Spectrometer 56 infrared observatory 56 Area Telescope LAT 56 Proba 2 56 Cygnus Lyra region 56 THEMIS satellites 56 FORCAST 56 orbiting telescope 56 multiband imaging photometer 56 HRSC 56 VLTI 56 Hubble 56 Shuttle Radar Topography 56 Solar Dynamics Observatory 56 resolution panchromatic 56 Moon Mineralogy Mapper 56 submillimeter wavelength 56 GROND 56 Planck satellite 56 interferogram 56 Raman spectra 56 Landsat satellite 56 orbiting observatory 56 QuickBird 56 Space Telescope 56 Great Observatories 56 LRO spacecraft 56 microshutters 56 ROSAT 56 astronomical telescope 56 Spectrometer 56 optical telescopes 56 spectrometer 56 Spitzer infrared 56 Mars Reconnaissance Orbiter 56 WMAP satellite 56 infrared ultraviolet 56 Extragalactic 56 filamentary structure 56 inch Samuel Oschin 56 SeaWiFS 56 IBEX spacecraft 56 LAGEOS 56 Proba 56 Advanced Synthetic Aperture 56 HiRISE 56 HiRISE image 56 La Silla Observatory 56 ultraviolet wavelengths 56 XMM Newton X ray 56 RXTE 56 Very Large Telescope 56 Ulysses spacecraft 56 Helioseismic 56 Mission SRTM 56 APXS 56 SIRAL 56 submillimetre 56 Interferometric 56 Composite Infrared Spectrometer 56 JDEM 56 ESA ERS 56 Infrared Mapping Spectrometer VIMS 56 NASA Landsat 56 Advanced Microwave Scanning 56 spectrographic 56 Total Ozone Mapping 56 Galaxy Evolution 55 Satellites GOES 55 SIM PlanetQuest 55 infrared spectrograph 55 Herschel telescope 55 panchromatic 55 NASA Stratospheric Observatory 55 NASA STEREO 55 Landsat satellites 55 Infrared Thermal Imaging Spectrometer 55 SOHO spacecraft 55 Moderate Resolution Imaging 55 Express orbiter 55 DISR 55 Gamma ray 55 Heterodyne Instrument 55 e MERLIN 55 Mars Orbiter Camera 55 UVIS 55 Herschel Space 55 sub millimeter wavelengths 55 spectrograph 55 distant quasar 55 Planck telescope 55 Laser Interferometer Gravitational Wave 55 Resourcesat 2 55 Deep Field HUDF 55 NASA twin STEREO 55 detect gravitational waves 55 photometric 55 ESO Paranal Observatory 55 ESA Envisat 55 flyby spacecraft 55 ESO telescopes 55 Hubble Telescope 55 Planetary Fourier Spectrometer PFS 55 ESO Very Large Telescope 55 optical microscope 55 astronomical objects 55 Telescope BAT 55 arcmin 55 TerraSAR X 55 spectroscopic measurements 55 Earth orbiting satellites 55 GOSAT 55 CRISM 55 rover panoramic 55 CALIPSO 55 NEOWISE 55 Compact Reconnaissance Imaging Spectrometer 55 Interferometer 55 SMOS mission 55 hexagonal mirrors 55 HARPS instrument 55 IR wavelengths 55 TSN PZ camera 55 telescope 55 panchromatic imagery 55 C1XS 55 EPOXI mission 55 Alpha Particle 55 Mini SAR 55 CoRoT 55 Stratospheric Observatory 55 ACS WFC 55 Churyumov Gerasimenko 55 Telescope LSST 55 GLAST 55 occultations 55 arcsec 55 orbiting telescopes 55 spatially resolved 55 Imaging Spectroradiometer MODIS instrument 55 Titan flybys 55 Cassini orbiter 55 wavebands 55 NIRSpec 55 Cosmic Microwave Background 55 telescopic observations 55 interferograms 55 RHESSI 55 NASA EPOXI mission 54 Adaptive Optics 54 Anisotropy Probe 54 LOFAR 54 Sojourner Rover 54 monochromator 54 synthetic aperture radar 54 Infrared Astronomical Satellite 54 HARPS spectrograph 54 CCDs 54 NASA Far Ultraviolet 54 deformable mirrors 54 Ocean Salinity SMOS 54 radio occultation 54 widefield 54 Cassini flybys 54 journal Meteoritics 54 interferometric observations 54 ICESat 54 infrared spectra 54 infrared spectrometer 54 DEIMOS 54 Comet Holmes 54 Hubble orbits 54 Cloud Aerosol Lidar 54 Hubble Space Telescope 54 Synthetic Aperture Radar 54 BepiColombo 54 Saturnian moon Titan 54 Fermi Gamma ray 54 HiRISE camera aboard 54 scanning electron 54 NASAs 54 Huygens mission 54 Robotic Arm Camera 54 distant supernovae 54 CoRoT satellite 54 situ measurements 54 Terrestrial Planet Finder 54 synthetic aperture 54 z ~ 54 panchromatic camera 54 Fomalhaut b 54 Infrared Pathfinder Satellite 54 radar altimeter 54 Nasa Mars Reconnaissance 54 Viking Orbiter 54 powder diffraction 54 Wilkinson Microwave Probe 54 X ray Telescope XRT 54 distant galaxy clusters 54 view Sensor SeaWiFS 54 OSIRIS 54 GigaGalaxy Zoom 54 Subaru Telescope 54 radar altimeters 54 MESSENGER spacecraft 54 GRB #B 54 Imaging Spectroradiometer MODIS 54 Antenna LISA 54 confocal 54 ESA Rosetta 54 GOES satellites 54 transmission electron microscopes 54 ESO La Silla 54 deconvolution 54 Observatory SDO 54 Comet Hartley 2 54 Spectrometers 54 Meteosat 54 multispectral imagery 54 inch refractor telescope 54 microscopic imager 54 photon counting 54 Mini TES 54 NIRCam 54 X ray wavelengths 54 SD OCT 54 TrES 54 FE SEM 54 Neutral Mass Spectrometer 54 astrometry 54 spectroscopic analysis 54 spiral galaxy NGC 54 gamma ray detectors 54 photoemission 54 gamma ray telescopes 54 solar corona 53 spaceborne 53 diffraction pattern 53 galaxy redshift 53 Mars Pathfinder lander 53 lunar topography 53 Array ALMA 53 transiting exoplanets 53 CARTOSAT 2A 53 NASA Great Observatories 53 GLAST Burst Monitor 53 Interior Laboratory GRAIL 53 X ray spectrometer 53 Titan flyby 53 Multispectral 53 NASA Stardust spacecraft 53 CBERS 53 AB Aurigae 53 spectroscopically 53 smallest exoplanet 53 extrasolar planets orbiting 53 ESO telescope 53 Diviner instrument 53 Cryosat 53 Ultraviolet Optical Telescope 53 aperture telescope 53 CloudSat 53 eyepiece #/#s f/#.# 53 interplanetary spacecraft 53 radiometer 53 COSMO SkyMed 53 planet TrES 53 neutron spectrometer 53 Viking Lander 53 highly elliptical orbit 53 Mars Climate Sounder 53 polar orbiting satellites 53 gradiometer 53 Mars orbiters 53 QWIP 53 Comet Lulin 53 submillimeter 53 Heliospheric Observatory SOHO 53 Advanced Camera 53 Kepler spacecraft 53 Hubble gyroscopes 53 hyperspectral sensors 53 Scanning Transmission Electron 53 RADARSAT 53 multibeam 53 ENVISAT 53 Infrared Astronomy 53 bolometer 53 Astrosat 53 redshift 53 Nikon D# Kowa 53 scatterometer 53 Moon Mineralogy Mapper M3 53 arcsecond 53 Aquarius SAC 53 optical interferometry 53 astronomical observations 53 Cassini flyby 53 Magnetospheric 53 Global Surveyor 53 Fermi LAT 53 NASA THEMIS 53 ESA Integral 53 LRO 53 UV VIS 53 telescopes 53 Mercury flyby 53 Spitzer IRAC 53 shorter wavelengths 53 hyperlens 53 NASA Kepler 53 NASA Lunar Reconnaissance 53 earthshine 53 Enceladus flyby 53 HARPS spectrograph attached 53 #x magnification [001] 53 Spectroscopic 53 spectrometers 53 stereoscopic images 53 absorption spectra 53 O OREOS 53 TerraSAR X satellite 53 Krimigis 53 OSIRIS REx 53 Comet Halley 53 backscattered 53 UltraCamXp 53 VIRTIS instrument 53 radial velocities 53 MESSENGER 53 Reflection Radiometer 53 confocal laser scanning 53 Pan STARRS 53 orthorectified 53 WMAP 53 Remote sensing 53 Mars Odyssey Orbiter 53 orbiting Hubble telescope 53 NASA Cosmic Background 53 supernova SN 53 THEMIS spacecraft 53 Microscopic Imager 53 Aqua satellite 53 linearly polarized 53 Submillimeter 53 MERIS 53 HiRISE images 53 Moderate Resolution 53 telescopic camera 53 ESA Herschel 53 irregularly shaped asteroid 53 Philae lander 52 imager 52 Chajnantor plateau 52 gravitationally lensed 52 Saturn moon Enceladus 52 galaxy M# [001] 52 Herschel Space Telescope 52 diffraction patterns 52 Cassini Huygens 52 micron wavelength 52 Muchachos Observatory 52 cryo electron microscope 52 extrasolar planet 52 Climate Experiment GRACE 52 Kuiper belt objects 52 OrbView 52 INTEGRAL 52 photoluminescence 52 MErcury Surface Space ENvironment 52 exo planet 52 Atacama Large Millimeter submillimeter 52 Oceansat 52 Suzaku X ray 52 KOMPSAT 52 Viking landers 52 laser altimetry 52 MARSIS 52 Fourier transform infrared 52 Cat Paw Nebula 52 radiometry 52 micrometre 52 Red Rectangle 52 ecliptic plane 52 adaptive optics AO 52 arcseconds 52 electron diffraction 52 Wilkinson Microwave Anisotropy Probe 52 optical microscopy 52 infrared 52 constellations Cygnus 52 Gravitational lensing 52 RS Ophiuchi 52 Nasa spacecraft 52 Gamma ray Large 52 batteries gyroscopes 52 Digitized Sky Survey 52 neutrino particles 52 polarimeter 52 Cosmic Evolution 52 Viking orbiters 52 auroral emissions 52 microlenses 52 Martian rovers 52 moon Charon 52 Imaging Telescope Array 52 NASA rovers Spirit 52 SDSS II 52 Mars orbiting spacecraft 52 spiral galaxy Messier 52 Infrared Astronomy SOFIA 52 X ray afterglow 52 scanning electron microscopes 52 scanning electron microscope SEM 52 x ray beam 52 Envisat Advanced Synthetic Aperture 52 extrasolar planets 52 HUDF# 52 particle analyzers 52 Galilean satellites 52 spectroscopic 52 LCLS 52 optical spectra 52 Mpc 52 orbital solitude 52 scanning optical microscopy 52 infrared mapping spectrometer 52 Mars Orbiter Laser Altimeter 52 Image Sensors 52 Axio Imager 52 origins spectrograph 52 INMS 52 orbiting Mars 52 XMM Newton satellite 52 exoplanets orbiting 52 Arecibo radar 52 Space Infrared Telescope 52 reionization 52 Keck Observatory 52 Solar Orbiter 52 IR LEDs 52 confocal microscopes 52 GIOVE B 52 APEX telescope 52 WM Keck Observatory 52 equatorial orbit 52 Uninhabited Aerial Vehicle 52 Dalcanton 52 aspheric lens 52 Terrain Mapping Camera 52 multispectral camera 52 spacecraft Cassini 52 Near Infrared 52 NASA Interstellar Boundary 52 UAVSAR 52 infrared spectrums 52 HIRES spectrometer 52 MetOp 52 intrinsic brightness 52 HESS telescopes 52 Solar Backscatter Ultraviolet 52 gamma ray observatories 52 Advanced LIGO 52 NEAs 52 Exmor ™ 52 Beta Pictoris b 52 Submillimeter Array 52 distant quasars 52 FT IR 52 STEREO mission 52 celestial object 52 magnifications 52 photomultiplier tube 52 Imaging Spectrograph 52 Greenbelt Md. manages 52 Mars Global Surveyor 52 WISE telescope 52 CIXS 52 Compton Gamma Ray 52 gravitational lenses 52 keV 52 stylus profilers 52 ESA Envisat satellite 52 polar orbiting 52 Interferometer VLTI 52 Sky Survey SDSS 52 Space Interferometry Mission 52 asteroid Steins 52 Cartosat 2B 52 Observatory STEREO 52 ultrashort pulses 51 FD OCT 51 WISE mapped 51 ultraviolet imaging spectrograph 51 Mossbauer spectrometer 51 RESOURCESAT 51 spectral radiance 51 Kuiper Belt Objects 51 Voyager spacecraft 51 bolometers 51 constellation Carina 51 OrbView 3 51 fluorescence spectroscopy 51 photon microscope 51 multiphoton 51 Transmission Electron Microscope 51 Venusian atmosphere 51 MODIS instrument 51 gamma ray detector 51 Cassini 51 Yinghuo 1 51 ExoMars rover 51 NEOSSat 51 Resolution Stereo Camera 51 deformable mirror 51 NFIRE 51 OGLE TR #b 51 ARPES 51 thermal infrared 51 Field Imager WFI 51 Ikonos 51 Virgo Cluster 51 Epsilon Aurigae 51 Igor Chekalin 51 Cartosat 2A 51 MTSAT 1R 51 Enceladus flybys 51 frequency comb 51 Spectroradiometer 51 NICMOS observations 51 Delfi C3 51 ExoMars mission 51 Global Surveyor spacecraft 51 planets orbiting distant 51 stereographic 51 earthlike planets 51 radial velocity 51 exoplanets planets 51 gravitational lens 51 x ray microscopy 51 HAT P 51 Fujinon lens 51 Photoacoustic 51 lensing galaxy 51 Keck Telescope 51 correlation spectroscopy 51 foreground galaxy 51 Io Europa 51 inch Schmidt Cassegrain 51 Jupiter Ganymede 51 multispectral imager 51 specular reflection 51 transmission electron microscope 51 Aerosol Polarimetry Sensor 51 probe microscopes SPMs 51 Nasa Kepler 51 AGNs 51 emission scanning electron 51 remote sensing satellite Resourcesat 51 Epsilon Eridani 51 comet Boethin 51 HD#b 51 celestial observations 51 HySI 51 Magnetic Imager 51 Dynamics Observatory 51 Optical Spectroscopic 51 outer corona 51 GRB# 51 UCO Lick 51 Ocean Salinity 51 X ray microscopy 51 TNOs 51 evanescent waves 51 shortwave infrared 51 type Ia supernovae 51 Veil Nebula 51 KAGUYA 51 NASA STScI 51 WISE spacecraft 51 Solar Dynamics 51 ALMA antennas 51 spectral imaging 51 spectral characteristics 51 FOV 51 infrared spectral 51 Adam Riess 51 orbiting Saturn 51 astrophysical phenomena 51 electric ion propulsion 51 planetary missions 51 monochromators 51 Ultraviolet Imaging Spectrograph UVIS 51 luminous galaxies 51 Pluto Charon 51 NFIRE satellite 51 remote sensing satellites 51 ultrahigh resolution 51 Triangulum Galaxy 51 THEMIS Images 51 #/#-ton truss 51 Orbiter spacecraft 51 spectrometric 51 frequency combs 51 Tomography SPECT 51 trans Neptunian objects 51 http:/www.nasa.gov/cassini 51 Bug Nebula 51 barred spiral galaxy 51 polarizing filters 51 photon fluorescence 51 asteroid Vesta 51 Hubble Space telescope 51 eyepieces 51 astronomical telescopes 51 Space ENvironment GEochemistry 51 confocal microscope 51 infrared interferometry 51 Synthetic Aperture 51 infrared telescope 51 EMCCD 51 stellar occultation 51 AERONET 51 Earth Observation satellites 51 Scatterometer 51 Advanced Spaceborne Thermal Emission 51 #nm #nm [001] 51 Extrasolar Planet Search 51 microwave radiometers 51 SRTM 51 optical aberrations 51 #nm wavelength [001] 51 Comet 9P/Tempel 1 51 Hubble Space 51 InfraRed 51 Ozone Monitoring 51 antineutrino 51 Airborne Topographic Mapper 51 OMEGA instrument 51 GRB #A 51 MESSENGER MErcury Surface 51 field Infrared Survey 51 inch refractor 51 wavelengths 51 Corot 9b 51 NASA Infrared Telescope 51 Kepler observatory 51 Planetary Transits 51 Quadrantid meteor shower 51 lunar orbiting spacecraft 51 Webb Telescope 51 Mini Thermal Emission 51 Solar Optical Telescope 51 RADARSAT 2 50 NASA Lunar Crater 50 Paranal 50 lunar orbits 50 Saturn Cassini 50 GOES N 50 SM4 50 gamma ray emission 50 LADEE 50 interferometry 50 Southern Observatory ESO 50 Planck observatory 50 X ray observatories 50 GOCE satellite 50 reconnaissance satellites 50 Geminga 50 Chilean Atacama Desert 50 E ELT 50 exosolar planets 50 DEM L# 50 onboard Chandrayaan 50 Chandra Observatory 50 attosecond 50 flyby Cassini 50 GOES O 50 EGRET 50 detector arrays 50 optical coherence tomography OCT 50 Thermal Emission Imaging 50 microlens 50 FORMOSAT 50 X ray pulses 50 NMR spectrometer 50 LWIR 50 New Horizons spacecraft 50 reflectometry 50 NASA rovers 50 ESA ASI 50 EF lenses 50 Axial Replacement 50 Satellite GOES 50 NASA Solar Terrestrial 50 Giove B 50 Resolution Instrument 50 NOAA GOES 50 Lunar CRater Observation 50 infrared microscopy 50 particle detector 50 IKONOS 50 Saturn rings 50 Ranging spacecraft 50 Corrective Optics Space Telescope 50 optical spectroscopy 50 Laser Interferometer Space 50 SHARAD 50 Cassini Huygens spacecraft 50 Mars Odyssey spacecraft 50 Radar ASAR 50 microlensing 50 interferometer 50 quantum cascade lasers 50 Butterfly Nebula 50 Shepherding Spacecraft 50 Infrared Camera 50 UV spectroscopy 50 gamma ray spectrometer 50 visit http:/saturn.jpl.nasa.gov 50 NASA Aqua 50 Heliospheric Investigation 50 twin STEREO spacecraft 50 helium ion 50 Optical Coherence Tomography 50 circularly polarized 50 Huygens descent 50 MODIS 50 CCD sensors 50 Hinode spacecraft 50 interstellar dust 50 NASA ICESat 50 neutrino experiments 50 Kibo robotic arm 50 robotic rovers 50 LCROSS spacecraft 50 Spitzer infrared spectrograph 50 Mimas 50 gamma ray telescope 50 steering wheel tilts 50 wavefront sensing 50 ASKAP 50 Unit Telescopes 50 Surface Stereo Imager 50 photomultiplier tubes 50 Tod Strohmayer 50 UV wavelengths 50 geosynchronous satellites 50 UK DMC2 50 fluorescence spectrometer 50 SBSS Block 50 Coma Cluster 50 Hyperspectral 50 orbiting Chandra 50 diffuse aurora 50 GLAST telescope 50 Decadal Survey 50 Sounder AIRS instrument 50 Atacama Large Millimeter Array 50 QCLs 50 Tropical Rainfall Measuring 50 Kepler telescope 50 radiometric measurements 50 planets Kepler 50 exo planets 50 chlorophyll fluorescence 50 MARSIS radar 50 photometers 50 SDSS telescope 50 auroral 50 Nanoprobe 50 Lagoon Nebula 50 STScI 50 interacting galaxies 50 curved mirrors 50 elliptical galaxy NGC 50 Nuclear Spectroscopic Telescope Array 50 focal lengths 50 atmospheric turbulence 50 Mars Pathfinder 50 Cerro Paranal 50 infrared laser beam 50 x ray pulses 50 D CIXS 50 G#.# +#.# 50 extrasolar planetary systems 50 noctilucent 50 SAXS 50 NASA MErcury Surface 50 Swift Ultraviolet Optical 50 InSAR 50 NASA Lunar CRater 50 Optical Microscope 50 comet Wild 50 astro comb 50 NASA QuikScat satellite 50 Envisat 50 Samuel Oschin Telescope 50 Imager 50 TacSat 50 rocky extrasolar planet 50 particle detectors 50 WIYN 50 Cosmic Microwave Background CMB 50 microlens array 50 SECCHI 50 X ray detector 50 weak gravitational lensing 50 SNe Ia 50 Infrared Astronomical Satellite IRAS 50 THz radiation 50 lunar orbiter Chang'e 50 Fourier transform 50 SPICAM 50 interferometers 50 backscattering 50 Microwave Imaging Radiometer 50 Huygens Probe 50 photon laser 50 AMSR E 50 spectro 50 extrasolar planetary 50 collimated beam 50 Planck spacecraft 50 cosmic ray detector 50 EDXRF 50 infrared IR 50 FUV 50 imagers 50 UDFy # 50 orbital resonance 50 blazar 50 Kuiper Belt object