Related by context. All words. (Click for frequent words.) 57 C/# [001] 55 ESA SMART 55 arcseconds 54 arcsec 53 Kepler 9c 53 PSR J# 53 Titan flyby 53 retrograde orbits 52 constellation Centaurus 52 star Spica 52 Cassini flybys 52 perihelion 52 NEAR Shoemaker 52 mu Arae 52 DSCS III 52 orbital 52 NASA EPOXI mission 52 Eridani 52 Ring Nebula 52 Saturn Cassini 52 Pluto Eris 52 Upsilon Andromedae 52 Churyumov Gerasimenko 51 constellation Hercules 51 planet Gliese #g 51 OGLE TR #b 51 constellation Scorpius 51 Comet Hartley 51 Gliese #e 51 Elenin 51 whiz harmlessly 51 Comet Hartley 2 51 Hyakutake 51 Uranus Neptune 51 Planetary Transits 51 OSIRIS 50 orbited Jupiter 50 ESA Herschel 50 prograde 50 YU# 50 aphelion 50 Galilean moons 50 moons orbiting 50 Pluto Charon 50 galaxy M# [001] 50 rotational axis 50 galaxy NGC 50 Explorer WISE 50 OGLE TR 50 Relations Observatory STEREO 50 constellation Andromeda 50 constellation Carina 49 celestial equator 49 COROT 49 sized planets orbiting 49 millisecond pulsar 49 EPOXI spacecraft 49 Omega Centauri 49 lobate scarps 49 telescopic observations 49 Astronomical Units 49 Cygnus Lyra region 49 arcminutes 49 comet Churyumov Gerasimenko 49 Orbiter MRO 49 Tempel Tuttle 49 highly elliptical orbit 49 equatorial orbit 49 Comet #P/Churyumov-Gerasimenko 49 rover Spirit landed 49 NASA twin STEREO 49 constellation Puppis 49 arcsecond 49 galactic disk 49 airglow 49 submillimetre 49 moon Io 49 BLG #Lb 49 Science Experiment HiRISE 48 Triangulum Galaxy 48 TSN PZ camera 48 Kepler 9b 48 Neptune Uranus 48 rocky extrasolar planet 48 P Churyumov Gerasimenko 48 Geminga 48 GALEX 48 axis perpendicular 48 magnetotail 48 gamma ray observatory 48 Methone 48 MetOp 48 S/# P2 48 constellation Aquarius 48 closest flyby 48 distant quasar 48 CoRoT 48 Syrtis Major 48 Venus Neptune Uranus 48 Toutatis 48 Saturn Uranus Neptune 48 PSR B# 48 equatorial latitudes 48 constellation Sagittarius 48 largest moon Charon 48 Uranus Jupiter 48 constellation Taurus 48 occultations 48 microquasar 48 located atop Mauna 48 MG J# +# 48 Epsilon Eridani 48 retroreflector 48 Using ESO Very 48 Comet #P 48 comet McNaught 48 Candor Chasma 48 Convection Rotation 48 SDSS II 48 orbital radius 48 MGS Mars Orbiter Camera 47 ESA Rosetta 47 Flyby spacecraft 47 planetary Transits 47 Arsia Mons 47 asteroid Eros 47 Fermi telescope 47 galactic equator 47 Beta Pictoris 47 redshift z = 47 van Arkel discovery 47 Cassini flyby 47 retrograde orbit 47 Cancri e 47 Fomalhaut b 47 constellation Ursa Major 47 magnetospheric 47 axial tilt 47 planets orbits 47 Nikon D# Kowa 47 Saturn moons Titan 47 trans Neptunian objects 47 Mini SAR 47 AU Mic 47 Lulin Observatory 47 thrilling stargazers 47 carbonaceous chondrites 47 ESA Huygens probe 47 Wolfgang Brandner 47 enters lunar orbit 47 Saturnian moons 47 Dumbbell Nebula 47 submillimetre wavelengths 47 DISR 47 polarimetry 47 elongated orbits 47 constellation Virgo 47 MN4 47 La Silla observatory 47 Kuiper belt object 47 Comet Halley 47 Mars CRISM 47 comet chaser 47 smoothest flattest 47 Earth radii 47 WISE spacecraft 47 Solar TErrestrial RElations Observatory 47 Mauna Kea Hawaii 47 THEMIS Image 47 Satellite Launch Vehicle PSLV 47 Comet McNaught 47 galaxy M# [002] 47 Perseus Cluster 47 Muchachos Observatory 47 Vourlidas 47 stellar occultation 47 emit X rays 47 BepiColombo 47 orbital eccentricity 47 Orion Nebula 47 planet transits 47 Terra Sirenum 47 #P/Churyumov-Gerasimenko 47 Anisotropy Probe WMAP 47 XMM Newton 47 stellar occultations 46 THEMIS spacecraft 46 Mercury flyby 46 starlike object 46 eyepiece #/#s f/#.# 46 gamma ray spectrometer 46 Multi Object Spectrometer 46 Comet Holmes 46 HARPS spectrograph attached 46 Rosetta spacecraft 46 backscattered 46 magnetic polarity 46 exoplanets planets 46 precessing 46 Saturn moons Enceladus 46 geosynchronous 46 Infrared Array Camera 46 Mars Uranus 46 absorbs photons 46 geyser plumes 46 Kepler discoveries 46 HD#b 46 circumstellar 46 NASA WMAP 46 Virgo cluster 46 WISE telescope 46 planet orbits 46 Ulysses spacecraft 46 sunlike star 46 albedo reflectivity 46 Comet Machholz 46 Imaging Spectrometer 46 lunar crust 46 solar radii 46 XMM Newton X ray 46 volcanic moon Io 46 Ocean Salinity 46 steering wheel tilts 46 radial velocity 46 ecliptic 46 spiral galaxy NGC 46 Hubble orbits 46 entire Milstar constellation 46 LORRI 46 spacecraft flyby 46 Makemake 46 moonlet 46 Hellas Basin 46 orbit GEO 46 orbital inclination 46 Greenbelt Md. manages 46 NASA rover Spirit 46 binary quasar 46 synchronous polar 46 Great Orion Nebula 46 Io Europa Ganymede 46 Comet NEAT 46 perigee closest 46 Diviner 46 thin crescent 46 cosmic cannibal 46 Horsehead Nebula 46 Eurockot 46 Mars Color Imager 46 elliptical orbits 46 lunar eclipse occurs 46 innermost planet 46 Upsilon Andromedae b 46 GRB #B 46 Spectroscopic 46 Sputnik beeped 46 Chajnantor plateau 46 C1 C3 46 transiting planet 46 Spectrograph 46 Rosetta orbiter 46 circumstellar disk 46 +#.# secs [002] 46 2MASS 46 Alycia Weinberger 46 laser altimeter 46 Thermal Emission Spectrometer 46 Swift Tuttle 46 J# +# [002] 46 Moderate Resolution Imaging 46 Kuiper Belt Object 46 Corot 7b 46 Giove B 46 ISRO Polar 46 Jupiter magnetosphere 46 OMEGA instrument 46 Climate Sounder 46 spiral galaxy Messier 46 dimensional atlas 45 exo planets 45 orbital resonance 45 Lagrangian 45 synchronous orbit 45 Chilean Atacama Desert 45 Galilean satellites 45 HUDF 45 GJ#b 45 dimming starlight 45 Solar Orbiter 45 linearly polarized 45 SN #A 45 Extrasolar Planet Search 45 onrushing comet 45 DEEP2 45 constellation Cygnus 45 Kuiper belt objects 45 Corot 9b 45 Kuiper Belt object 45 #cd m 45 spectroscopically 45 ST3 45 constellation Eridanus 45 Planck telescope 45 sun synchronous orbit 45 NASA Wilkinson Microwave 45 COROT 7b 45 orbiting gamma ray 45 Comet Churyumov Gerasimenko 45 Roger Shammo 45 Exoplanets 45 gaseous planet 45 Philae lander 45 extrasolar planetary systems 45 planemos 45 VIRTIS 45 imaging spectrometer 45 S/# S1 45 supernova SN 45 smallest exoplanet 45 constellation Cetus 45 Anisotropy Probe 45 spacecraft orbited 45 Infrared Pathfinder Satellite 45 EPOCh 45 repeated fly bys 45 perigee nearest point 45 CoRoT satellite 45 eclipsing binary 45 ellipsoid 45 inch Samuel Oschin 45 Observatoire de Paris 45 Jovian moons 45 APXS 45 planetary nebulas 45 comet #P/Churyumov-Gerasimenko 45 gravitational interaction 45 geo synchronous transfer 45 Fomalhaut 45 SMOS 45 Jupiter Ganymede 45 Kepler Space Telescope 45 solar corona 45 HD# [002] 45 INTUIT INC. 45 Io Europa 45 particle analyzers 45 Olympus Mons 45 celestial sphere 45 Wilkinson Microwave Anisotropy Probe 45 jovian 45 Red Rectangle 45 Small Magellanic Cloud 45 LAGEOS 45 Ultraviolet Imaging Spectrograph UVIS 45 Solar Dynamics Observatory 45 Europa Orbiter 45 Kailash Sahu 45 PSR B# +# 45 AB Aurigae 45 submillimeter wavelength 45 orbiting Saturn 45 planet Uranus 45 ESA Planck 45 slender crescent 45 CoRoT #b 45 comets orbiting 45 #.#nm [002] 45 Nasa Mars Odyssey 45 Composite Infrared Spectrometer 45 ecliptic plane 45 Giovanni Cassini 45 ray Space Telescope 45 XMM Newton satellite 45 heliospheric 45 ASTRA 1G 45 HiRISE 45 star Beta Pictoris 45 waning gibbous 45 star clusters nebulae 45 NGC# 45 Extragalactic 45 Mars Pathfinder lander 45 THEMIS 45 IBEX spacecraft 45 Herschel Space 45 XTE J# 45 nebular 45 planet TrES 45 Saturn Enceladus 44 chondritic 44 astrometry 44 planets Uranus 44 Titan flybys 44 luminous galaxies 44 Andromeda Galaxy 44 z ~ 44 inhabitable planets 44 Earth magnetotail 44 gravitationally lensed 44 Mars Odyssey Orbiter 44 Neptune Jupiter 44 Pavonis Mons 44 geo synchronous 44 Surveys ACS 44 Wilkinson Microwave Probe 44 twin STEREO spacecraft 44 Planck satellite 44 substorm 44 orbits Saturn 44 Deep Impact eXtended Investigation 44 Scorpii 44 Kepler #b 44 Orbiter LRO 44 exoplanet orbiting 44 Quadrantids 44 ah dus 44 Cepheids 44 Galaxy Evolution 44 TrES 44 Cancri 44 Space Telescopes 44 asteroid Vesta 44 Mössbauer 44 spectroscopic observations 44 Descent Imager Spectral Radiometer 44 circular orbits 44 comets meteors 44 gravitational lenses 44 mineralogical composition 44 HiRISE camera aboard 44 Ranging spacecraft 44 Express orbiter 44 moons Phobos 44 Suzaku X ray 44 extrasolar 44 Isidis Planitia 44 planets moons 44 SIM PlanetQuest 44 THEMIS Images 44 #x magnification [002] 44 interstellar cloud 44 moons circling 44 distant quasars 44 interferometric observations 44 Catalunyan GP 44 Gliese #d 44 tidally locked 44 astrometric 44 X ray binaries 44 Martian orbit 44 look distractingly cartoony 44 infrared spectra 44 unpolarized 44 RRATs 44 Bug Nebula 44 La Silla Chile 44 perigee 44 supergiant star 44 Astrological lore 44 Cassini radar 44 hundred thousandth 44 AGNs 44 circular orbit 44 UKIRT 44 ARRL AMSAT 44 cosmic ray flux 44 outermost planets 44 Optical Spectroscopic 44 submillimeter wavelengths 44 shuttle Atlantis docked 44 Cosmic Microwave Background 44 Fermi LAT 44 waning crescent 44 Spitzer Space Telescopes 44 THEMIS satellites 44 Fermi Gamma ray 44 protoplanetary 44 spectrographs 44 neutral mass spectrometer 44 NICMOS 44 Red Bull Cosworth 44 orbits 44 Beta Pictoris b 44 Zeta Ophiuchi 44 orbiting 44 Certificate Downgraded 44 visit http:/saturn.jpl.nasa.gov 44 Martian moons 44 occulted 44 planets asteroids 44 planet orbiting 44 discover Fomalhaut 44 SOHO spacecraft 44 Seyfert galaxies 43 zodiacal light 43 Kaliurang located 43 orbiting observatories 43 Miniature Synthetic Aperture Radar 43 Cloud Aerosol Lidar 43 Ranging MESSENGER spacecraft 43 red supergiant 43 icy moons 43 waxing gibbous 43 moon Phobos 43 LCROSS spacecraft 43 Corser Suzuki 43 Mars Uranus Neptune 43 Charon Pluto 43 Paranal Chile 43 cluster NGC 43 Samuel Oschin Telescope 43 infrared interferometry 43 ESO telescope 43 BP Piscium 43 Jupiter Uranus 43 Shackleton crater 43 G#.# +#.# 43 Paul Chodas 43 Fornax 43 Compact Reconnaissance Imaging Spectrometer 43 superheated gases surrounding 43 P/# A2 43 Deep Impact probe 43 flyby spacecraft 43 Deep Impact craft 43 WASP #b 43 geomicrobiology studying particles 43 Venusian surface 43 sextile 43 eccentric orbits 43 zodiac constellations 43 Space Infrared Telescope 43 moon Ganymede 43 geo stationary orbit 43 Gliese #c 43 TrES 4 43 Jupiter Saturn 43 aboard Soyuz TMA 43 lunar orbits 43 Mars Neptune Uranus 43 Paul Dumbrell Holden 43 Eurostar E# 43 journal Meteoritics 43 Gliese #g 43 orbital solitude 43 Kiruna Sweden 43 Delta Cephei 43 plutoids 43 ESA Cluster 43 infrared astronomy 43 NASA ICESat 43 Pleiades cluster 43 UVIS 43 valence electron 43 Hubble observations 43 Saturn moon Enceladus 43 aboard Vostok 43 NASA LCROSS 43 Helios 2B 43 Orion nebula 43 emit photon 43 CHARA 43 Tharsis Rise 43 interacting galaxies 43 Hakan Svedhem 43 Rosetta comet chaser 43 spinning clockwise 43 comets asteroids 43 silicon monoxide 43 WFC3 43 Hezbollah guerrillas shelled 43 GQ Lupi 43 ESO VLT 43 permanently shadowed craters 43 Mössbauer spectrometer 43 Hubble Space Telescope HST 43 Pleiades star 43 Near Infrared Camera 43 Solar Optical Telescope 43 circumstellar disks 43 Subaru telescope 43 EGRET 43 dynamical evolution 43 Bonnie Buratti 43 coronagraph 43 HAT P 43 Stephan Quintet 43 Pancam 43 RHESSI 43 NASA Cosmic Background 43 Terrestrial Planet Finder TPF 43 Shepherding Spacecraft 43 MESSENGER spacecraft 43 STEREO spacecraft 43 WMAP satellite 43 Garth Tander Holden 43 Soyuz spacecraft docked 43 Advanced Microwave Scanning 43 BBSNews #-#-# NASA 43 constellation Gemini 43 Coma Cluster 43 Franck Marchis 43 rotating neutron stars 43 comet flyby 43 Astra 1L 43 exoplanetary 43 Hipparcos 43 Kepler spacecraft 43 German SAR Lupe 43 photometer 43 ATV Johannes Kepler 43 Crab Nebula 43 SMBH 43 lunar equator 43 starburst galaxies 43 gravitationally bound 43 Geosynchronous orbit 43 Drake Deming 43 orbiting Chandra 43 Astrophysical 43 photometry 43 Endurance crater 43 WISE infrared 43 Sasselov 42 elliptic 42 Cosmic Evolution 42 waxing crescent 42 SINFONI 42 NASA Kepler 42 sunlike stars 42 geosynchronous transfer orbit 42 http:/saturn.jpl.nasa.gov 42 Enceladus flybys 42 gaseous planets 42 interstellar dust particles 42 JPL manages 42 Hispasat 1E 42 choking irritants 42 planets orbiting distant 42 planet Gliese #c 42 planets comets 42 azimuthal 42 Multi Object Spectrograph 42 LRO spacecraft 42 ILS Proton Successfully Launches 42 geosynchronous Earth 42 noctilucent clouds 42 Kuiper Belt Objects 42 ST5 42 Rockot launch 42 Venus Jupiter Uranus 42 photosphere 42 NYSE DENT 42 protoplanet 42 pointings 42 X ray telescopes 42 exo planet 42 ChemCam 42 galaxy cluster 42 NASA MErcury Surface 42 #P/Holmes 42 Neutron Spectrometer 42 microlensing 42 Skynet 5B 42 CoRoT 7b 42 cesium atom 42 docking adapter 42 magnetic dipole 42 distant galaxy 42 El Teide 42 Atlantis undocks 42 planets constellations 42 Cassini 42 Spectrometers 42 Europa Ganymede 42 ESA XMM Newton 42 Crab pulsar 42 TanDEM X 42 comet Wild 42 comet nucleus 42 Dominique Cassini 42 asteroids orbiting 42 Heliophysics 42 Igor Chekalin 42 pentacene molecule 42 cm -3 42 High Resolution Imaging 42 planets orbiting sun 42 Proxima Centauri 42 ESA Integral 42 lensing galaxy 42 comet Tempel Tuttle 42 redshifts 42 infrared telescope 42 Mars Orbiter 42 Katzman Automatic 42 NASA STEREO 42 Glonass satellites 42 HRSC 42 spatially resolved 42 telescope atop Mauna 42 globular cluster 42 UCO Lick 42 Context Camera 42 cosmological distances 42 SBSS satellite 42 Interferometric 42 GA6 42 NASA Stardust spacecraft 42 Orientale Basin 42 X ray observatory 42 Meridiani plains 42 Planck spacecraft 42 transiting exoplanet 42 Keck telescope 42 CoRoT 9b 42 NASA Cassini spacecraft 42 rotates clockwise 42 S1 truss 42 Infrared Camera 42 SKY WATCH 42 Lunokhod 42 Gemini telescopes 42 bedrock outcropping 42 Kepler telescope 42 gravitational keyhole 42 NASA rovers Spirit 42 Fig. 2A 42 Las Campanas Chile 42 Cassini spacecraft 42 Edmund Halley 42 Cassini Image 42 #/#-ton truss 42 Enceladus 42 exoplanets orbiting 42 asteroseismology 42 microlensing events 42 velocity vector 42 waning crescent Moon 42 Libra constellation Vogt 42 RXTE 42 lunar orbiter Chang'e 42 Solar Terrestrial Relations 42 ellipsoids 42 #degrees East 42 -# degrees centigrade [001] 42 Sergey Lavrov underlined 42 Submillimeter 42 Wide Angle Camera 42 Palaeozoic sedimentary 42 INTEGRAL satellite 42 TenCate occupies leading 41 comets moons 41 Caloris 41 shepherding spacecraft 41 elongated orbit 41 Saturnian moon Titan 41 HD #b [002] 41 Gerhard Schwehm 41 SMOS Soil Moisture 41 constellation Pisces 41 Observatory STEREO 41 blazar 41 Viking orbiters 41 Mars Reconnaissance Orbiter MRO 41 X ray spectrometer 41 periodic dimming 41 launching Andrian Nikolayev 41 Gravitational lensing 41 Foton M3 41 Characterization EPOCh 41 transiting exoplanets 41 sun corona 41 Comet Lulin 41 Lyman alpha 41 TVID 41 antiparallel 41 lunar craters 41 KAGUYA 41 SNR #-#.# 41 Turksat 4A 41 Bok globules 41 VIRTIS instrument 41 lander rover 41 Eurobird 41 Mount Bosavi 41 Lunar Reconnaissance Orbiter LRO 41 planets orbiting 41 Epoxi 41 silicate dust 41 globular cluster M# 41 absorbs photon 41 diffraction patterns 41 celestial object 41 hydrazine thrusters 41 X ray emission 41 planet HD #b 41 neutron spectrometer 41 Space Interferometry Mission 41 Phobos Grunt 41 Helix nebula 41 multiband imaging photometer 41 elliptical orbit 41 Saturn moons 41 CSIRO Parkes radio 41 Anik F3 41 HD #b [001] 41 Epsilon Aurigae 41 moon Charon 41 ESA comet chaser 41 spacecraft orbiting 41 Orionids 41 outermost planet 41 Kounotori2 41 Cydonia region 41 circularize 41 Dallara Mercedes #:#.# 41 Original Song Down 41 Jules Verne ATV 41 Extrasolar Planets 41 water hypothesizes Stephane 41 Chandra Observatory 41 Earth magnetosphere 41 Arabsat 5A 41 Terra Meridiani 41 X ray wavelengths 41 Solar System 41 Atlantis Undocks From 41 faint smudge 41 Mojzsis 41 LCROSS Lunar Crater Observation 41 planets 41 Optus D3 41 Cosmic Background Explorer 41 extrasolar planet 41 Saturn rings 41 Mercury magnetosphere 41 earthshine 41 KBOs 41 protoplanetary disk 41 GIOVE B 41 Socompa 41 planet gravitational tug 41 probe Chang'e 41 MF1 Toyota 41 rotaxane 41 MErcury Surface Space ENvironment 41 Mars Jupiter Uranus 41 WMAP 41 Atlantis rocketed 41 STEREO 41 Carl Zeiss Tessar lens 41 cometary 41 cosmological observations 41 Gerard Kuiper 41 ultraviolet spectrometer 41 intrinsic brightness 41 Mini Thermal Emission 41 remanent 41 Mars Pathfinder 41 Orionid meteors 41 Saturn outermost 41 radial velocity technique 41 POSITIONS AVAILABLE Wendy 41 found circling Gliese 41 ESA ERS 41 martian surface 41 NuSTAR 41 Maguindanao province Brawner 41 Herschel Space Telescope 41 Coma cluster 41 rotate counter clockwise 41 optical wavelengths 41 1worldspace TM 41 Perseid shower occurs 41 SN#A 41 NASA THEMIS 41 UNDIVIDED INTEREST PT 41 Mars Odyssey spacecraft 41 highly elliptical orbits 41 Today waxing Virgo 41 lunar perigee 41 Shuttle undocks 41 scanning electron microscope SEM 41 X ray binary 41 SECCHI 41 Exoplanet 41 auroral 41 properties rheology 41 shadowy craters 41 Lola B# 41 blazars 41 OMS pods 41 Keck telescopes 41 Kepler Mission 41 Telescope BAT 41 HiRISE camera 41 KH #D 41 HUBBLE 41 Hydrospheric 41 spacecraft Cassini 41 bipyridine 41 spectrometric 41 constellation Lyra 41 AKARI 41 Aurigid 41 ExoMars Trace Gas 41 AVHRR 41 orbiting Mars 41 millisecond pulsars 41 SHARAD 41 spheroidal 41 Observatory SDO 41 Gamma ray burst 41 claimed toteplacepot 41 infrared wavelength 41 Asterisks indicate 41 Optical Gravitational Lensing Experiment 41 X ray emitting 41 Adjust oven 41 Infrared Thermal Imaging Spectrometer 41 NICMOS observations 41 astronomical objects 40 KIPAC 40 Jenniskens 40 fainter objects 40 orbitals 40 astrobiological 40 Mossbauer 40 Global Surveyor 40 planet magnetosphere 40 geosynchronous transfer 40 Mercury Uranus 40 EPOXI 40 composite infrared spectrometer 40 magnetar 40 volcano Olympus Mons 40 NASA Great Observatories 40 Pluto dwarf 40 Planetary Fourier Spectrometer PFS 40 Anthony Remijan 40 Keplerian 40 Venus Uranus 40 rotate clockwise 40 HL Tau 40 X ray Telescope XRT 40 Crab Pulsar 40 Shuttle Atlantis blasts 40 IDR affirmed 40 Super Earths 40 Eta Aquarids 40 Nasa Kepler 40 quasar 40 Fig. 1A 40 # Apophis 40 OGLE 40 GLAST telescope 40 #gy 40 exosolar planets 40 electron doped 40 FIB SEM 40 CALIPSO 40 Helioseismic 40 outer corona 40 X ray afterglow 40 VLBA 40 asteroid Itokawa 40 GJ #b [002] 40 #B# [009] 40 F#W 40 supermassive 40 figs. 40 IR wavelengths 40 SPICAM 40 Saturnian system 40 Mars northern latitudes 40 interstellar clouds 40 Valles Marineris canyon 40 penumbral shadow 40 Sun synchronous orbit 40 detect gamma rays 40 meteoritic material 40 GJ #b [001] 40 gravitational perturbations 40 payload fairings 40 telescopes atop Mauna 40 OSTM Jason 2 40 celestial observations 40 Å -1 40 HOUSE Remains 40 GOCE 40 detect gravitational waves 40 Giovanni Fazio 40 planetary nebulae 40 Voyager spacecraft 40 Oceansat 40 Magellanic Clouds 40 Endeavour undocks 40 NASA Fermi Gamma