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(Click for frequent words.) 65 observatories 62 infrared telescopes 61 infrared astronomy 60 astronomical telescope 60 Array ALMA 59 hexagonal mirrors 59 radiotelescope 59 robotic rovers 59 observatory 59 ESO Paranal Observatory 59 Keck telescopes 59 astronomical observatory 58 Cerro Paranal 58 AERONET 58 Telescope LSST 57 Cerro Pachón 57 Atacama Large Millimeter submillimeter 57 robotic telescopes 57 X ray observatory 56 orbiting Hubble Space Telescope 56 Martian rovers 56 astrophysical phenomena 56 exoplanetary 56 planetary Transits 56 Telescope Array 56 THEMIS satellites 56 optical telescope 56 Chajnantor plateau 56 orbiting observatories 56 gamma ray observatory 56 infrared observatory 56 neutrino telescope 55 X ray telescopes 55 lunar orbiters 55 Solar TErrestrial RElations Observatory 55 Comet Halley 55 Cerro Pachon 55 astronomical telescopes 55 interplanetary spacecraft 55 Laser Interferometer Gravitational Wave 55 Landsat satellite 55 Suzaku X ray 55 Keck Telescopes 55 telescopes 55 LOFAR 55 radar altimetry 55 VISTA telescope 55 celestial observations 55 astronomical observations 54 NASA THEMIS 54 satellites orbiting Earth 54 Subaru Telescope 54 Keck Telescope 54 spacecraft Cassini 54 unmanned probes 54 Moon Mineralogy Mapper M3 54 Delta Cephei 54 WMAP satellite 54 La Silla observatory 54 cosmic ray observatory 54 optical infrared telescope 54 ESO VLT 54 particle physics experiments 54 Submillimeter Array 54 ROSAT 54 distant supernovas 54 Chajnantor 54 Auger Observatory 54 Cerro Armazones 54 Earth orbiting satellites 53 Galilean satellites 53 Saturnian moon Titan 53 inch refractor telescope 53 unmanned lunar orbiter 53 twin Voyager spacecraft 53 Orion nebula 53 Nasa Kepler 53 Pan STARRS 53 infrared telescope 53 Fermi telescope 53 Solar Dynamics Observatory 53 lunar equator 53 Hubble Space Telescope HST 53 X ray observatories 53 Kitt Peak 53 Herschel telescope 53 Convection Rotation 53 Faulkes Telescope 53 Keck telescope 53 IBEX spacecraft 53 Cerro Tololo 53 gamma ray telescope 53 Philae lander 53 telescope 53 ESA Planck 53 ENVISAT 53 neutrino observatory 53 coronal loops 53 spacecraft orbiting 52 Paranal 52 Planck satellite 52 meter Keck telescopes 52 occultations 52 Orbiter MRO 52 WIYN telescope 52 USArray 52 ESA XMM Newton 52 Roque de los 52 TecSAR 52 Voyager spacecraft 52 IceCube 52 Large Binocular Telescope LBT 52 ray Space Telescope 52 Interferometer VLTI 52 aerosol measurements 52 Yinghuo 1 52 infrared spectrometers 52 ESO telescopes 52 Herschel Space 52 Samuel Oschin Telescope 52 extrasolar planets orbiting 52 Mars moon Phobos 52 E ELT 52 APEX telescope 52 Infrared Astronomical Satellite IRAS 52 Olympus Mons 52 Voyager probes 52 atop Mauna Kea 52 spacecraft orbited 52 SOAR telescope 52 neutrino experiments 52 HARPS instrument 52 ESA Integral 52 Shenzhou spacecraft 52 astronomy 52 Ulysses spacecraft 52 geodynamic 52 Galactic cosmic rays 52 orbiter Cassini 52 gamma ray detectors 51 Super Kamiokande 51 THEMIS mission 51 Atacama Large Millimeter Array 51 Observatory STEREO 51 Pierre Auger Observatory 51 radio occultation 51 spaceborne 51 telescopic observations 51 BepiColombo 51 UKIRT 51 celestial mechanics 51 manned lunar 51 LRO spacecraft 51 neutrino particles 51 Explorer WISE 51 orbiting gamma ray 51 neutrino detector 51 e MERLIN 51 Las Campanas Observatory 51 Observatory SDO 51 spectroscopic measurements 51 Rosetta orbiter 51 meteorological satellites 51 Martian craters 51 Chilean Atacama Desert 51 Lovell Telescope 51 earthshine 51 geodesy 51 orbiting telescopes 51 SuperWASP 51 Viking Lander 51 aperture telescope 51 Solar Terrestrial Relations 51 optical telescopes 51 X ray telescope 51 lunar landers 51 robotic explorers 51 astronomers 51 NAOJ 51 particle detectors 51 ExoMars rover 51 NASA MESSENGER spacecraft 51 Valles Marineris canyon 51 Wolszczan 51 robotic landers 51 Canary Telescope 51 stellar occultations 51 Great Observatories 51 interferograms 51 UCO Lick 51 spacecraft Chandrayaan 1 51 microshutters 51 Keck Observatory 51 astrometry 51 detect gravitational waves 51 radial velocity technique 51 THEMIS probes 51 ESA Envisat 51 probe Huygens 51 SeaWiFS 51 astrometric 51 neutrino detectors 51 defile Mauna Kea 51 Aquarius SAC 51 auroral displays 51 Pan STARRS telescope 51 celestial phenomena 51 EarthScope 50 Saturnian moon 50 NASA Stratospheric Observatory 50 retroreflector 50 Hobby Eberly Telescope 50 La Silla Observatory 50 exhaust plume 50 Paranal Observatory 50 ALMA antennas 50 unmanned spacecraft 50 astronomer Percival Lowell 50 ecliptic plane 50 NuSTAR 50 lunar orbiter Chang'e 50 remote sensing satellites 50 airborne observatory 50 polar mesospheric clouds 50 polarimetric 50 Chankillo 50 Mauna Kea Hawaii 50 spacecrafts 50 Saturn Cassini 50 KamLAND 50 Astro E2 50 Curiosity rover 50 imaging spectrometer 50 airglow 50 NASA Wilkinson Microwave 50 Microlensing Observations 50 constellation Eridanus 50 lunar rovers 50 Relations Observatory STEREO 50 WM Keck Observatory 50 stargates 50 inhabitable planets 50 GALEX 50 MARSIS radar 50 cosmic phenomena 50 orbiting Saturn 50 volcanic plumes 50 National Astronomical Observatories 50 NASA Cosmic Background 50 HiRISE camera 50 Earth Observation EO 50 planetary explorations 50 Lunar Reconnaissance Orbiter LRO 50 observational astronomy 50 Galileo spacecraft 50 Nasa spacecraft 50 heliophysics 50 Cosmic Microwave Background 50 STEREO spacecraft 50 Jovian moons 50 Muchachos Observatory 50 GOES satellites 50 Gusev crater 50 moon Io 50 XMM Newton 50 Helios 2B 50 Rosetta lander 50 Infrared Astronomy SOFIA 50 HIAPER 50 exoplanet hunter 50 robotic probes 50 cosmological distances 50 Anisotropy Probe WMAP 50 Southern Observatory ESO 50 Syrtis Major 50 Optical Gravitational Lensing Experiment 50 cinder cones 50 Magellan telescopes 50 Theodore von Karman 50 Large Binocular Telescope 50 Gerard Kuiper 50 exo planet 50 geostationary orbits 50 Pluto Charon 49 NASA satellites orbiting 49 interferometers 49 Wilkinson Microwave Anisotropy Probe 49 protoplanetary 49 Opportunity Mars rover 49 Planck telescope 49 Keck Interferometer 49 asteroseismology 49 ROCSAT 2 49 LROC 49 Cassini Huygens 49 Subaru telescope 49 Chang'eI 49 WISE infrared 49 Martian terrain 49 CoRoT satellite 49 MARSIS 49 inch Samuel Oschin 49 NASA Kepler spacecraft 49 exoplanets planets 49 Martian crater 49 neutrino beam 49 Epsilon Aurigae 49 IceCube telescope 49 Raman Effect 49 astronomer Johannes Kepler 49 Palomar Observatory 49 Ultraviolet Optical Telescope 49 outermost planets 49 Nikku Madhusudhan 49 COBE satellite 49 NASA Far Ultraviolet 49 Kuiper Belt Objects 49 planetary missions 49 noctilucent clouds 49 inch refracting telescope 49 Shackleton crater 49 CALIPSO 49 planetarium dome 49 ESO Very Large Telescope 49 Rosette Nebula 49 geomicrobiology 49 elliptical galaxy NGC 49 Michibiki 49 orbiting telescope 49 Remote sensing 49 Very Large Array 49 particle astrophysics 49 Lick Observatory 49 NASA STEREO 49 Tharsis Rise 49 Solar Observatory 49 Thermal Emission Spectrometer 49 crewed spacecraft 49 microlensing 49 Fra Mauro 49 waning gibbous 49 POES satellites 49 thin crescent 49 filamentary structure 49 exo planets 49 astronomy observatory 49 Observatory Very 49 meter Keck telescope 49 electric ion propulsion 49 origins spectrograph 49 manned spaceships 49 asteroids comets 49 Huygens lander 49 dynamical evolution 49 Mossbauer spectrometer 49 Orbiter LRO 49 STEREO mission 49 Thirty Meter Telescope 49 neutrino physics 49 Advanced LIGO 49 GOCE satellite 49 lunar orbiter 49 Hawaii Mauna Kea 49 trans Neptunian objects 49 D CIXS 49 particle colliders 49 Faint Object 49 UVIS instrument 49 Hellas Basin 49 solar radii 49 Mars landers 49 Arecibo telescope 49 synchrotron x ray 48 Churyumov Gerasimenko 48 Supernova #A 48 constellation Cassiopeia 48 Infrared Pathfinder Satellite 48 SKA telescope 48 MicroFUN 48 JIMO 48 Saturnian moons 48 Kuiper belt objects 48 NPO Lavochkin 48 gamma ray telescopes 48 Upsilon Andromedae 48 Cassini Huygens spacecraft 48 Cometary 48 Astrophysics MOA 48 probe Chang'e 48 interferometric technique 48 exosolar planets 48 Amateur astronomers 48 Uninhabited Aerial Vehicle 48 WFC3 48 synchrotrons 48 gravitational lenses 48 Geminga 48 infrared wavelength 48 RS Ophiuchi 48 Express orbiter 48 constellation Carina 48 spectrographs 48 interplanetary probes 48 spacecraft 48 Astrophysicists 48 Astrophysical Research 48 Lunar Laser Ranging 48 Explorer IBEX 48 Rockot launcher 48 sundials 48 ASKAP 48 GOSAT 48 National Astronomical Observatory 48 spectroscopic observations 48 NASA Gamma ray 48 Large Synoptic Survey 48 Huygens descent 48 Gemini telescopes 48 Quadrantid meteor shower 48 Context Camera 48 Lulin Observatory 48 lunar orbits 48 Infrared Telescope 48 remote sensing satellite Resourcesat 48 http:/media#.washingtonpost.com/wp-dyn/content/phDoktor Haze 48 bedrock outcropping 48 penetrating radar 48 LOFAR telescope 48 TanDEM X 48 particle smasher 48 enters lunar orbit 48 Lagoon Nebula 48 Astrosat 48 Viking landers 48 Earthscope 48 extrasolar 48 solar corona 48 Extremely Large Telescope 48 NOAO 48 NASA Interstellar Boundary 48 distant quasars 48 Decadal Survey 48 X ray wavelengths 48 Cloud Aerosol Lidar 48 Lunar Reconnaissance Orbiter Camera 48 Anisotropy Probe 48 Kunlun Station 48 System QZSS 48 planet Nibiru 48 X ray afterglow 48 MG J# +# 48 Manchester Jodrell Bank 48 Aqua satellite 48 Ellery Hale 48 HM Cancri 48 Soyuz booster 48 remote sensing instruments 48 Iapetus Saturn 48 renowned astrophysics observatory 48 meteorological oceanographic 48 Landsat satellites 48 galaxy M# [001] 48 Horizons spacecraft 48 earthlike planets 48 Grote Reber 48 satellites orbiting 48 NASAs 48 ESA Cluster 48 asteroid collisions 48 distant quasar 48 geologies 48 Lunar Orbiter 48 Shepherding Spacecraft 48 observatory telescope 48 spacecraft Hayabusa 48 hypersonic speeds 48 ADM Aeolus 48 Shackleton Crater 48 jovian 48 HiRISE camera aboard 48 polar orbiting 48 ExoMars mission 48 Dendrochronology 48 astronomical phenomena 48 Sojourner rover 48 COSMO SkyMed 48 paleomagnetic 48 NASA rover Spirit 48 Climate Experiment GRACE 47 NASA twin STEREO 47 Titan Saturn 47 robotic explorer 47 cryo electron microscope 47 Shuttle Radar Topography 47 planets orbiting sun 47 THEMIS spacecraft 47 Pleiades star 47 heavily instrumented 47 moons circling 47 laser altimeter 47 extragalactic 47 SCISAT 47 manned lunar missions 47 X ray spectrometer 47 RAS Observatory 47 exoplanets orbiting 47 spectral fingerprints 47 Giovanni Cassini 47 gravitational microlensing 47 Rosetta spacecraft 47 gamma ray observatories 47 constellation Centaurus 47 astroparticle physics 47 twin STEREO spacecraft 47 Opportunity rover 47 Hinode spacecraft 47 orbit GEO 47 Japan NAOJ 47 Venusian surface 47 galaxies nebulae 47 mineralogical mapping 47 optical wavelengths 47 cosmic ray particles 47 lava tubes 47 particle detector 47 Hinode 47 Manned missions 47 Stratospheric Observatory 47 observing satellites 47 Jonathan Lunine 47 planets orbiting stars 47 Space Telescope GLAST 47 Steward Observatory 47 infrared spectral 47 microlensing events 47 Noctilucent clouds 47 Viking orbiters 47 entered lunar orbit 47 astrobiological 47 Dynamics Observatory 47 IYA# 47 planet magnetosphere 47 refracting telescope 47 Mars Color Imager 47 moons Phobos 47 planet Uranus 47 astronomer Ptolemy 47 Beta Pictoris b 47 geodetic 47 geomagnetism 47 noctilucent 47 Active Galactic Nuclei 47 gradiometer 47 Near Infrared Camera 47 Spaceguard 47 orbital rendezvous 47 neutrino experiment 47 HARPS spectrograph 47 submillimetre 47 Evolution Explorer 47 slender crescent 47 ultraviolet spectrograph 47 Mössbauer 47 heliospheric 47 eclipsing binary 47 gaseous planet 47 Square Kilometer Array 47 synchronous orbit 47 high altitude airship 47 basaltic rocks 47 microbial ecosystems 47 hyper spectral 47 nanomechanics 47 Observatories 47 physicists 47 galactic magnetic 47 Telescope 47 Terra Meridiani 47 Herschel Space Telescope 47 Australian SKA Pathfinder 47 Diviner 47 rock outcrop 47 N. Rathnasree 47 rovers Spirit 47 Pleiades cluster 47 earth orbiting satellites 47 Arsia Mons 47 aboard ESA Envisat 47 flyby Cassini 47 Vexcel Corporation 47 Toutatis 47 Nankai Trough Zone 47 cosmic particles 47 Kepler Mission 47 Quasi Zenith Satellite 47 skywatching 47 GJ#b 47 telescopes atop Mauna 47 EarthCARE 47 KODAK CCD Image Sensors 47 EVLA 47 situ measurements 47 planetary astronomer 47 photometry 47 colliders 47 biosignatures 47 Jupiter Icy Moons Orbiter 47 exobiology 47 Minotaur rocket 47 galaxy M# [002] 47 Moon Mineralogy Mapper 47 DEPTHX 47 constellation Hercules 47 Galilean moons 47 robotic rover 47 BLG #Lb 47 Jay Melosh 47 Aristarchus 47 RapidEye constellation 47 outer planets 47 Plate tectonics 47 Saturn moon Iapetus 47 Exoplanets 47 lunar explorer 47 Upsilon Andromedae b 47 WISE spacecraft 47 astro comb 47 Polar Regions 47 Observatory 47 APXS 47 submillimeter 47 scientists 47 Space Administration CNSA 47 Extraterrestrial UFOs 47 NEOSSat 47 Perseus Cluster 47 geostationary communications 47 Aerosonde aircraft 46 Cepheid variables 46 Maunder minimum 46 Jupiter moon Io 46 orbiting Hubble telescope 46 mineral olivine 46 Dobsonian telescope 46 Horsehead Nebula 46 Astronomical Observatory 46 interstellar boundary 46 spectrographic 46 Mars orbiters 46 faraway planets 46 Saturn Enceladus 46 Cosmic ray 46 circumlunar satellite 46 interferometer 46 GROND 46 Quadrantids 46 Anthony Remijan 46 ringed planet 46 asteroid Lutetia 46 neutron detector 46 Cosmic rays 46 sunlike stars 46 Gamma ray Large 46 Fermi Gamma ray 46 spiral galaxy NGC 46 Giant Magellan Telescope 46 Martian lander 46 satellites 46 visit http:/saturn.jpl.nasa.gov 46 Mars CRISM 46 NASA CloudSat 46 parabolic antennas 46 HARPS spectrograph attached 46 X ray detector 46 DubaiSat 1 46 polarimetry 46 TerraSAR X 46 lunar crust 46 elliptical orbits 46 underwater volcanos 46 Tagish Lake meteorite 46 Diviner instrument 46 microwave radiometer 46 comet Lulin 46 Shallow Subsurface Radar 46 AKARI 46 moon Charon 46 MIRTHE 46 Proba 2 46 retrograde orbit 46 ESO telescope 46 Extreme Ultraviolet Imaging Spectrometer 46 Mars Pathfinder 46 Resourcesat 2 46 Foing 46 spaceward 46 Mission SRTM 46 geoneutrinos 46 supergiant star 46 ESA Herschel 46 brightest supernova 46 reconnaissance satellites 46 planets orbiting distant 46 Roden Crater 46 ESA ASI 46 Helioseismic 46 ESO La Silla 46 SIRTF 46 Saturnian system 46 Alpha Particle 46 luminous galaxies 46 theoretical astrophysics 46 Very Large Telescope 46 Planetary Transits 46 rocky extrasolar planet 46 Comet 9P/Tempel 1 46 Giove B 46 Sun synchronous orbit 46 continuously erupting volcano 46 Kepler 9c 46 Ranging spacecraft 46 GeneSat 46 Multi Object Spectrograph 46 stratospheric balloon 46 ionized gases 46 flood basalts 46 Digitized Sky Survey 46 spectroscope 46 Mössbauer spectrometer 46 Corot 7b 46 planets atmospheres 46 EPOCh 46 Bramley Murton 46 Borexino 46 HD# [002] 46 Rosetta comet chaser 46 Neutron Detector 46 moons orbiting 46 geochronology 46 Dumbbell Nebula 46 midlatitude 46 planetary geologists 46 lunar maria 46 celestial sphere 46 Veil Nebula 46 Kepler spacecraft 46 Omega Nebula 46 Nicholas Copernicus 46 gamma ray detector 46 Type Ia supernovas 46 Okeanos Explorer 46 geosynchronous satellites 46 Cartosat 2B 46 prominences 46 Nili Fossae 46 hubble 46 Brigham Grette 46 Infrared Astronomy 46 Eagle Nebula 46 VLTI 46 constellation Aquila 46 Arecibo Observatory 46 linear collider 46 Great Orion Nebula 46 RHESSI 46 yardangs 46 constellation Serpens 46 mu Arae 46 Ring Nebula 46 Youthsat 46 asteroids orbiting 46 fainter objects 46 ATST 46 cluster NGC 46 Ariane launcher 46 circumstellar disks 46 Jodrell Bank 46 planetary transits 46 Earthlike planets 46 Heliospheric Observatory SOHO 46 occulted 46 galactic nuclei 46 RXTE 46 SOHO spacecraft 46 Foton M3 46 Mauna Loa volcano 46 Bank Telescope GBT 46 stratovolcano 46 Nicolaus Copernicus 46 Great Observatories Origins 46 COROT 46 highly elliptical orbits 46 Miniature Synthetic Aperture Radar 46 Omega Centauri 46 lensing galaxy 46 OSIRIS 46 optical interferometry 46 adaptive optics 46 remote sensing satellite 46 Cancri e 46 Galileoscope 46 Huygens mission 46 Lunar CRater Observation 46 Cygnus Lyra region 46 Hinode satellite 46 unpiloted aircraft 46 Descent Imager Spectral Radiometer 46 Aryabhatta 46 Shri Kulkarni 46 waxing gibbous 46 Pasachoff 46 Long Wavelength Array 46 tallest lighthouse 46 SkyCenter 46 Lunokhod 46 planets Uranus 46 Marsis 46 Mars Pathfinder lander 46 submillimeter wavelength 46 amateur stargazers 46 rover panoramic 46 interstellar particles 45 Hayabusa spacecraft 45 Earth ionosphere 45 Interferometric Synthetic Aperture Radar 45 IFSAR 45 hydrothermal vent 45 robotic rover Spirit 45 remote sensing 45 Harlow Shapley 45 ESA Envisat satellite 45 Sushil Atreya 45 Solar Orbiter 45 COROT 7b 45 Starfire Optical Range 45 SPICAM 45 Microlensing Follow Up 45 Cosmic Background Explorer 45 UC Observatories Lick 45 GJ #b [002] 45 Gamma ray burst 45 SMOS 45 robotic lander 45 Ranging MESSENGER spacecraft 45 gravitational wave 45 geo stationary orbit 45 Shenzhou spaceships 45 undersea volcanoes 45 Kuiper Belt Object 45 Phobos Grunt 45 Crab Pulsar 45 Orion Nebula 45 X ray Telescope 45 lightwaves 45 coldest driest 45 Galaxy Evolution 45 Antenna LISA 45 Taklimakan Desert 45 Synthetic Aperture Radar 45 zodiac constellations 45 Project Ozma 45 gaseous planets 45 planetary exploration 45 photometer 45 powerful particle accelerator 45 Telescope BAT 45 globular cluster M# 45 origami masters 45 Global Positioning Satellites 45 accelerographs 45 Earth Observation satellites 45 HESS telescopes 45 Astronomy buffs 45 neutron spectrometer 45 Jovian moon 45 comet Hale Bopp 45 Orientale Basin 45 VIRTIS instrument 45 HIRES spectrometer 45 heliocentric model 45 scanning electron microscopes 45 Michael Studinger 45 smallest exoplanet 45 NASA Cassini spacecraft 45 Planck spacecraft 45 Hipparchus 45 dusty disks 45 William Herschel Telescope 45 Mars orbiting spacecraft 45 Jupiter Uranus 45 http:/www.nasa.gov/cassini 45 KBOs 45 robotic spacecraft 45 CoRoT 9b 45 Kepler Telescope 45 Galileo telescope 45 auroral activity 45 AB Aurigae 45 spectral bands 45 binocular telescope 45 LightSail 1 45 SDSS II 45 driest deserts 45 planetoids 45 UA Lunar 45 VB #b 45 penetrating radars 45 GLAST telescope 45 Methone 45 orbiting observatory 45 Comet Boethin 45 Tanegashima Space Center 45 magnetotail 45 lunar craters 45 Spitzer infrared 45 thermonuclear fusion 45 meteorology climatology 45 NASA Infrared Telescope 45 Moderate Resolution Imaging 45 Plate Boundary 45 GRB #A 45 orbiting Chandra 45 VLBA observations 45 constellation Ara 45 X ray Telescope XRT 45 Spirit Mars rover 45 seismographs 45 Redu Belgium 45 adaptive optics AO 45 Martian meteorites 45 Comet NEAT 45 geo stationary satellites 45 decadal survey 45 Insat 3A 45 comets meteors 45 rover Spirit 45 curved mirrors 45 GIS remote sensing 45 Jiaolong 45 cryocooler 45 polar oceans 45 High Resolution Imaging 45 HiRISE image 45 globulars 45 Imaging Spectrograph 45 Predator drone flies 45 Huygens spacecraft 45 NASA Landsat 45 geo synchronous 45 interstellar dust samples 45 Apophis asteroid 45 Bug Nebula 45 terraformed 45 twin Keck telescopes 45 crustal thickness 45 terra forming 45 IRC +# 45 Lowell Observatory 45 Comet #P/Churyumov-Gerasimenko 45 Comet Lulin 45 telescope atop Mauna 45 Sumatra Andaman earthquake 45 Lyman alpha 45 millimeter wavelengths 45 Gamburtsev 45 Aberdeen Oceanlab 45 VLBA 45 polar vortex 45 SDSS telescope 45 lunar landings 45 imaging spectroscopy 45 TrES 4 45 Reflection Radiometer 45 Miniature Thermal Emission 45 planetary atmospheres 45 IKONOS 45 Observatory LIGO 45 lunar 45 Observatory telescope 45 Herbig Haro 45 orbital insertion 45 manned spacecraft 45 dimensional atlas 45 Saturn moon Enceladus 45 interplanetary missions 45 Alfven waves 45 Cosmic Background Explorer COBE 45 Chile Atacama 45 radar interferometry 45 NASA ESA Hubble 45 Kitt Peak Observatory 45 e VLBI 45 Pancam 45 atop dormant volcano 45 radar altimeters 45 galactic cosmic ray 45 geostationary satellite 45 SCIAMACHY 45 Solar Optical Telescope