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(Click for frequent words.) 73 orbit 70 Earth orbit LEO 66 spacecraft 64 polar orbit 62 orbits 62 geosynchronous orbit 62 orbiting 60 lunar orbit 60 highly elliptical orbit 59 crewed spacecraft 59 Earth Orbit LEO 59 orbital 58 robotic spacecraft 58 geostationary orbits 58 human spaceflight 58 circular orbit 58 geostationary orbit 58 elliptical orbit 57 manned spacecraft 56 unmanned probes 56 Churyumov Gerasimenko 56 orbital rendezvous 56 Chang'eI 55 hypersonic speeds 55 orbital velocity 55 ion propulsion 55 Comet #P/Churyumov-Gerasimenko 55 highly elliptical orbits 55 spacecrafts 55 orbit GEO 55 Manned missions 55 lunar landers 55 orbiting satellites 54 orbiter 54 manned spaceflight 54 suborbital trajectory 54 geo synchronous 54 Nasa spacecraft 54 outer space 54 spaceward 54 #P/Churyumov-Gerasimenko 54 spaceflight 54 BepiColombo 54 Stardust spacecraft 53 outer planets 53 Curiosity rover 53 lunar orbits 53 NASA Stardust spacecraft 53 elliptical orbits 53 entire Milstar constellation 53 Comet Churyumov Gerasimenko 53 satellites orbiting Earth 53 Saturn Cassini 53 geosynchronous 53 NASA 53 IBEX spacecraft 53 synchronous orbit 53 planetary missions 53 Foton M2 53 NASA MESSENGER spacecraft 53 Ulysses spacecraft 53 sub orbital 53 preset orbit 53 geo stationary orbit 53 interstellar particles 52 interplanetary spacecraft 52 unmanned spacecraft 52 spokesman Michael Braukus 52 reusable manned spacecraft 52 satellites 52 Solar TErrestrial RElations Observatory 52 Ranging spacecraft 52 manned Shenzhou 52 FASTSAT 52 deorbiting 52 payloads 52 ballistic trajectory 52 Martian orbit 52 planetary Transits 52 International Space Station 52 spaceplane 52 geo synchronous transfer 52 suborbital flight 52 LEO satellites 52 planets orbits 52 lunar missions 52 deorbit 52 twin Voyager spacecraft 52 Yinghuo 1 51 orbital altitude 51 Horizons spacecraft 51 equatorial orbit 51 lunar surface 51 Shenzhou spacecraft 51 elongated orbit 51 Orion capsule 51 NEOSSat 51 MESSENGER spacecraft 51 earth orbiting satellites 51 Cygnus spacecraft 51 Earth orbiting satellites 51 manned lunar 51 fiery reentry 51 comet #P/Churyumov-Gerasimenko 51 comet chaser 51 Crew Exploration 51 mesosphere 51 GEochemistry 51 LADEE 51 Voyager spacecraft 51 Shenzhou VI capsule 51 robotic rovers 51 perihelion 51 Mars Pathfinder lander 51 Proba 2 51 reusable spacecraft 51 orbital inclination 51 aphelion 51 Jupiter Icy Moons 51 orbited 51 innermost planet 51 comets orbiting 51 suborbital 51 ferrying astronauts 51 Martian rovers 51 meteoroid 50 circular orbits 50 Sojourner rover 50 Earth asteroids 50 MErcury Surface Space ENvironment 50 Comet Boethin 50 gaseous planet 50 asteroid Itokawa 50 scramjets 50 OSIRIS REx 50 Mars Pathfinder 50 O OREOS 50 Jovian moons 50 SpaceX Dragon capsule 50 Zeta Ophiuchi 50 crewed missions 50 Foton spacecraft 50 Yarkovsky effect 50 geosynchronous satellite 50 manned spaceship 50 orbital insertion 50 EPOXI mission 50 Kliper 50 Helios 2B 50 moon 50 Cassini Huygens spacecraft 50 STSS Demo 50 Epsilon Eridani 50 circumlunar 50 electric ion propulsion 50 asteroid Vesta 50 geostationary 50 Red Planet 50 orbit GTO 50 lander rover 50 CHIPSat 50 SpaceX Dragon 50 Lunar Reconnaissance Orbiter LRO 50 Hubble Space telescope 50 gravitational slingshot 50 Lt. Col. Yang Liwei 50 martian atmosphere 50 Ariane rocket 50 NASAs 50 Nasa 50 asteroids 50 geosynchronous orbits 50 Rosetta comet chaser 50 interplanetary 50 geo synchronous orbit 50 Saturn outermost moon 50 comet nucleus 50 unpiloted 50 shuttle orbiter 50 Martian atmosphere 50 geosynchronous transfer 50 asteroid 50 Spaceguard Survey 50 Galileo spacecraft 50 Cassini Huygens 50 cosmic ray particles 50 flyby spacecraft 50 Pluto Charon 50 rocket thrusters 50 Geosynchronous orbit 50 Messenger spacecraft 50 winged spacecraft 49 Earth asteroid Itokawa 49 Stardust capsule 49 perigee 49 Atlantis undocks 49 interstellar space 49 manned lunar missions 49 Sun synchronous orbit 49 suborbital spacecraft 49 spacecraft Chandrayaan 1 49 Mars moon Phobos 49 maneuvering thrusters 49 Earth 49 Minotaur rocket 49 Shuttle undocks 49 New Horizons spacecraft 49 retrograde orbit 49 microgravity environment 49 orbited Earth 49 geosynchronous satellites 49 ROCSAT 2 49 Deep Impact craft 49 Kepler 9c 49 Philae lander 49 ionosphere 49 Space ENvironment GEochemistry 49 Compton Gamma Ray 49 drogue parachute 49 Dyna Soar 49 orbiting observatories 49 Orion spacecraft 49 Doohan ashes 49 robotic probes 49 aboard Skylab 49 COROT 49 Wolszczan 49 icy moons 49 Shuttle Discovery blasts 49 Vinasat 49 thruster firings 49 Field Infrared Survey 49 heavier payloads 49 ARCTUS 49 orbiting observatory 49 spaceflyers 49 Discovery undocked 49 Kepler spacecraft 49 orbiting telescope 49 scramjet engines 49 GSAT 5P 49 LRO LCROSS 49 perilune 49 NROL 49 STEREO spacecraft 49 orbiting Hubble Space Telescope 49 NASA THEMIS 49 Solar System 49 retrorockets 49 polar orbits 49 NFIRE satellite 49 JIMO 49 Shenzhou V 49 Lunar Prospector 49 interstellar dust samples 49 Itokawa 49 APXS 49 Lunar Orbit 48 rover Spirit 48 Soyuz rocket 48 orbiter lander 48 orbiters 48 interplanetary missions 48 spacecraft Cassini 48 Altair lunar lander 48 Foton M3 48 geostationary transfer 48 MetOp satellite 48 lunar 48 Cosmodrome 48 inhabitable planets 48 PSLV rocket 48 experimental payloads 48 Voyager probes 48 robotic explorer 48 exoplanets planets 48 space shuttle 48 orbiting telescopes 48 comets asteroids 48 magnetotail 48 HAMSAT 48 Hubble Space Telescope 48 Jupiter Ganymede 48 Solar Orbiter 48 Martian rover 48 GJ#b 48 lunar lander 48 Soyuz 48 lunar orbiter 48 Titan IVB 48 hypersonic glider 48 orbiting spacecraft 48 hypersonic missiles 48 astronauts 48 LISA Pathfinder 48 Mars Odyssey spacecraft 48 Soviet Union Yuri Gagarin 48 dexterous robot 48 Endeavour Crater 48 prograde 48 Martian surface 48 Hubble telescope 48 geosynchronous Earth 48 interplanetary probes 48 Rosetta spacecraft 48 ecliptic plane 48 Stardust NExT 48 probe Chang'e 48 manned orbital 48 Ares rocket 48 Space Station 48 Orbital Express 48 SpaceX Falcon 9 48 SMOS Soil Moisture 48 impactors 48 WISE spacecraft 48 meteoritic material 48 Shuttle Endeavour undocks 48 Comet Hartley 2 48 Orbiting 48 aerobraking 48 sun synchronous orbit 48 shuttle 48 xenon propellant 48 Shenzhou V spacecraft 48 Webb Telescope 48 NuSTAR 48 hypersonic flight 48 Vehicle CEV 48 lunar exploration 48 LightSail 48 manned missions 48 GALEX 48 DSCS satellites 48 waning gibbous 48 hypervelocity 48 Gedmark 48 Russian Soyuz 48 Hubble 48 landers 48 Cosmonaut Yuri Gagarin 48 EPOCh 48 suborbital space 48 Cancri e 47 Anik F3 47 Sirangelo 47 Skynet 5C 47 STEREO mission 47 Suborbital 47 Chandrayaan II 47 INSAT 4CR 47 elliptical polar 47 Mars 47 comet Churyumov Gerasimenko 47 crawler transporter 47 PSLV C6 47 pericentre 47 orbital debris 47 galactic cosmic rays 47 Geosynchronous Transfer Orbit GTO 47 Earthlike planet 47 SpaceX Falcon 47 Ariane launcher 47 Upsilon Andromedae 47 Canadarms 47 Phobos Grunt 47 closest flyby 47 Divine Vessel 47 eccentric orbits 47 orbiting laboratory 47 spacecraft orbited 47 Earth radii 47 LCROSS 47 Fomalhaut b 47 spaceships 47 Cassini 47 CALIPSO satellites 47 reentry capsule 47 penumbral shadow 47 gravitational keyhole 47 Proxima Centauri 47 SIRTF 47 EELVs 47 lander 47 Comet Halley 47 SIM PlanetQuest 47 thruster rockets 47 John Callas rover 47 Soyuz spacecraft 47 comet flyby 47 slender crescent 47 manned spaceships 47 Beidou satellite 47 Apollo missions 47 heliophysics 47 orbital maneuvering 47 ion thrusters 47 cometary debris 47 Virgin Galactic SpaceShipTwo 47 Atlantis payload bay 47 Orion Ares 47 troposphere 47 asteroid belt 47 Cryosat 47 robotic rover 47 SpaceLoft XL 47 geostationary satellite 47 OSIRIS Rex 47 uncrewed 47 spaceship 47 Launch Vehicle 47 THEMIS satellites 47 Spaceguard 47 NFIRE 47 JAXA 47 nanosatellites 47 spacefaring 47 Cape Canaveral 47 Soyuz FG 47 spacecraft orbiting 47 Kuiper belt object 47 Ringed Planet 47 deorbited 47 Orionids 47 twin rovers Spirit 47 X ray observatory 47 EELV 47 Martian crater 47 Mars Reconnaissance Orbiter 47 galactic disk 47 Saturn magnetosphere 47 solar radii 47 manned spaceflights 47 remote sensing satellite Resourcesat 47 ATV Johannes Kepler 47 2F rocket 47 NanoSail D 47 orbiting outpost 47 undocks 47 Comet Hartley 47 payload 47 particle detector 47 commander Dmitry Kondratyev 47 WASP #b 47 planetary 46 NASA Kepler telescope 46 Weightless Wonder 46 Jules Verne ATV 46 GSLV Mk III 46 suborbital rocket 46 Reusable Launch Vehicle 46 celestial sphere 46 geostationary satellites 46 Kounotori2 46 Victoria Crater 46 Deep Impact comet 46 shuttlecock shaped capsule 46 robotic explorers 46 GSLV rocket 46 C NOFS 46 BepiColombo mission 46 robotic lander 46 martian surface 46 lunar regolith 46 Orbital Taurus II 46 Space Exploration 46 asteroids comets 46 moons orbiting 46 ISS 46 orbiting Saturn 46 PSLV C 46 lunar equator 46 ESA Planck 46 elongated orbits 46 suborbital rockets 46 NASA LCROSS 46 Flyby spacecraft 46 planetary spacecraft 46 Chandrayaan 46 field Infrared Survey 46 geostationary communications 46 geostationary earth 46 shuttle Endeavor 46 Express AM# 46 Relations Observatory STEREO 46 stationary lander 46 SELENE probe 46 JWST 46 Proton Breeze M 46 Milstar II 46 circularize 46 Shuttle Endeavour blasts 46 mission Chandrayaan 46 twin rover Opportunity 46 WISE mapped 46 moon Io 46 Observatory SDO 46 Exploration Vehicle 46 windshield wiper maneuver 46 transiting exoplanet 46 constellation Libra 46 tidal bulge 46 Ares IX rocket 46 habitable worlds 46 Shuttle Endeavor 46 synchronous polar 46 Interstellar Boundary Explorer 46 thin crescent 46 colonize Mars 46 suborbital spaceflight 46 Hubble orbits 46 Fermi telescope 46 cosmic ray 46 Kuiper Belt objects 46 sunlike star 46 Crew Launch Vehicle 46 planetary exploration 46 Shackleton crater 46 gamma ray observatory 46 airglow 46 outermost planets 46 SpaceShip Two 46 manned lunar landing 46 scramjet engine 46 Isidis Planitia 46 atmospheric reentry 46 planetary science 46 DART spacecraft 46 X ray binary 46 hydrazine thrusters 46 Galactic cosmic rays 46 radioisotope thermoelectric generator 46 exosphere 46 RQ# 46 Tanegashima Space Center 46 Epoxi 46 axial tilt 46 THEMIS spacecraft 46 Grammier 46 bone jarring descent 46 Upsilon Andromedae b 46 Yahsat 1A 46 probe Huygens 46 Saturn rings 46 Simonetta Di Pipo 46 Oort Cloud 46 unpowered glider 46 solar corona 46 hypersonic 46 microgravity 46 infrared telescopes 46 Rosaviakosmos 46 GSLV D3 rocket 46 Geosynchronous Transfer Orbit 46 northern arctic plains 46 midcourse phase 46 spacemen Timothy Kopra 46 Astronaut Sunita Williams 46 planets 46 INSAT satellites 46 comet orbit 46 Astrobotic 46 meteorological satellites 46 EPOXI 46 planetary orbits 46 Mars rovers Spirit 46 Mars Opportunity rover 46 astronauts Jing Haipeng 46 Plesetsk 46 Ranging MESSENGER spacecraft 46 SpaceshipTwo 46 Stratellite 46 dummy payload 46 Centaur rocket 46 comets 45 NASA twin rovers 45 interstellar distances 45 Vehicle PSLV 45 comet Boethin 45 lunar perigee 45 Jupiter icy moons 45 rotational axis 45 ringed planet 45 sub orbital spaceflight 45 Baikonur Kazakhstan 45 SpaceX Dragon spacecraft 45 Aries Taurus 45 planetary surfaces 45 shuttle Discovery undocked 45 Mars landers 45 Convection Rotation 45 nanosatellite 45 Atlantis STS 45 Soyuz landings 45 NASA twin STEREO 45 infrared astronomy 45 ion thruster 45 Chandrayan 45 shuttle Discovery 45 Glonass satellites 45 NEAs 45 GSLV D3 45 shielding tiles 45 inter planetary 45 ion propulsion engines 45 SBSS satellite 45 KBOs 45 pressurized module 45 ISS resupply 45 Huygens 45 VASIMR 45 wife commissioned Celestis 45 Chairman G Madhavan 45 INSAT 3D 45 Lunokhod 45 CoRoT satellite 45 coronal mass ejections CMEs 45 OCO satellite 45 Laser Interferometer Space 45 Interplanetary Internet 45 lunar probe Chang'e 45 LAGEOS 45 Russian cosmonaut Yuri Gagarin 45 PSLV C# 45 jovian 45 shuttle Atlantis 45 Orbiter MRO 45 Carina constellation 45 planets orbiting sun 45 six wheeled rover 45 moonbase 45 GOES O 45 P Churyumov Gerasimenko 45 Insat 3A 45 Progress resupply 45 Deep Impact flyby spacecraft 45 photosphere 45 Space Agency 45 Shenzhou VII 45 SOHO spacecraft 45 Cosmic rays 45 spaceflights 45 Discovery undocks 45 Commander Charlie Hobaugh 45 Globalstar satellites 45 Tempel 1 45 Interorbital Systems 45 Shenzhou spaceships 45 protoplanet 45 Jupiter flyby 45 navigate autonomously 45 meteoroids 45 Shenzhou capsule 45 NAVSTAR Global Positioning System 45 onboard Chandrayaan 45 Shuttle Endeavour docks 45 Ion propulsion 45 GOCE 45 Cabeus crater 45 comet orbital 45 LCROSS spacecraft 45 spokesman Barron Beneski 45 shuttle Endeavour STS 45 Hubble servicing 45 Mike Suffredini 45 hydrostatic equilibrium 45 exoplanetary 45 Soyuz spaceship 45 Huygens descent 45 Iridium satellites 45 Mars orbiter 45 ballistic descent 45 retroreflector 45 DigitalGlobe WorldView 45 space module Tiangong 45 Kazakhstan Baikonur Cosmodrome 45 Shuttle docks 45 Russian cosmonaut Alexander Kaleri 45 Interior Laboratory GRAIL 45 Air Force Evolved Expendable 45 orbit insertion 45 micrometeoroids 45 Earth orbiting LEO 45 INSAT 3E 45 comet dust 45 HM Cancri 45 NPO Lavochkin 45 Crewmate Tracy Caldwell 45 rover 45 Resourcesat 2 45 Cloud Aerosol Lidar 45 irregularly shaped asteroid 45 Asteroid Itokawa 45 Soyuz craft 45 Dragon capsule 45 aboard Taurus XL 45 commander Sergei Volkov 45 SpaceLoft XL rocket 45 Based Infrared 45 Globalstar constellation 45 INSAT 4B 45 rover Opportunity 45 Pluto Eris 45 Asteroid Belt 45 stellar occultation 45 Saturnian moon Titan 45 unmanned lunar orbiter 45 asteroids Ceres 45 engineer Timothy Kopra 45 ESA Rosetta 45 Vehicle ATV 45 habitable planets 45 Nikolai Budarin 45 SBSP 45 Shenzhou VII spacecraft 45 Gravity Probe 45 Rutan SpaceShipOne 45 micrometeorite 45 Molniya M 45 Infrared Pathfinder Satellite 45 Carl Marchetto 45 geosynchronous satellite launch 45 Mandushev 45 astronomical observatories 45 infrared wavelengths 45 telescopic observations 45 Russian Soyuz rocket 45 Beidou 45 CloudSat 45 Dmitry Kondratyev 45 Earth ionosphere 45 Shenzhou VI 45 solar flares 45 MESSENGER 45 terrestrial planets 45 Field Infrared Experiment 45 Yuri Shargin 45 extrasolar 45 rover Sojourner 45 payload bay 45 KAGUYA 45 NASA MErcury Surface 45 Jupiter magnetosphere 45 Orbiter LRO 45 deorbit burn 45 duration spaceflights 45 Endeavour undocks 45 Spirit Mars rover 45 SMOS mission 45 SMOS 45 Chang'e 45 orbit geostationary 45 Shenzhou IV 45 P#/P# truss 45 Martian lander 45 Xichang 45 Impact Probe MIP 45 suborbital flights 45 Solar Dynamics Observatory 44 HIAPER 44 lunar probe 44 orbital altitudes 44 satellite constellation 44 Opportunity rovers 44 orbital resonance 44 SPACE.com 44 Emily Lakdawalla 44 Alexander Samokutyayev 44 observable universe 44 X ray telescope 44 SpaceShip One 44 coronal mass ejections 44 orbiting Kepler telescope 44 STP S# 44 Atlantis Undocks From 44 lunar module Eagle 44 HD#b 44 Glonass navigation satellites 44 potentially habitable planets 44 infrared telescope 44 Russian Valeri Polyakov 44 ESA Huygens probe 44 Soyuz booster 44 JDEM 44 A# spacecraft 44 detect gravitational waves 44 Laboratory MSL 44 HTV2 44 sols 44 interstellar dust grains 44 Glonass K 44 galaxy M# [001] 44 Rockot launch 44 ISC Kosmotras 44 celestial observations 44 Deep Impact probe 44 PSLV C9 44 aboard Soyuz spacecraft 44 comet Tempel 1 44 GLAST telescope 44 GJ #b [002] 44 Space Shuttle 44 orbiting complex 44 laser altimeter 44 Atlantis rocketed 44 Cassini spacecraft 44 TDRS K 44 Comet Lulin 44 lunar orbiter Chang'e 44 Huygens mission 44 Japan Kibo laboratory 44 redshifted 44 Kazakhstan Baikonur cosmodrome 44 smallest exoplanet 44 SpaceShipOne 44 satellite GSAT 44 Mars Reconnaissance Orbiter MRO 44 Viking Lander 44 TacSat 44 moons Phobos 44 Geminga 44 Spacecraft 44 WISE telescope 44 comet 44 SCISAT 44 VINASAT 1 44 ESA Huygens 44 Kuiper belt 44 Vostok spacecraft 44 Kazakhstan Baikonur 44 heliosheath 44 Geosynchronous 44 Pluto Kuiper Belt 44 observing satellites 44 Vehicle PSLV C9 44 extrasolar planetary systems 44 unmanned lunar 44 Lunar Exploration 44 Soyuz rockets 44 Russian Soyuz capsules 44 Russian Dnepr rocket 44 Hayabusa spacecraft 44 Baikonur Cosmodrome 44 millisecond pulsar 44 engineer Garrett Reisman 44 Ocean Salinity 44 Oort cloud 44 Skynet 5B 44 Soviet cosmonaut Yuri Gagarin 44 unmanned spaceplane 44 Jupiter Icy Moons Orbiter 44 Jiuquan Satellite Launch 44 Venus Climate Orbiter 44 orbital eccentricity 44 WD5 44 Pirs Docking Compartment 44 ENAs 44 propulsion subsystem 44 Shuttle Discovery undocks 44 Space Capsule 44 cosmic radiation 44 SpaceShipOne rocket 44 enters lunar orbit 44 autonomous rendezvous 44 shepherding spacecraft 44 Skylab 44 Decadal Survey 44 ESA SMART 44 taikonaut 44 geosynchronous transfer orbit 44 NASA Gamma ray 44 Shepherding Spacecraft 44 ExoMars rover 44 Saturnian 44 Soyuz Fregat 44 Milky Way Galaxy 44 lunar orbiters 44 Roddenberrys remains 44 auroral displays 44 storable propellants 44 Donald Yeomans 44 Daniel Tani floated 44 Discovery astronauts 44 CoRoT 44 Martian moons 44 asteroid flyby 44 subsurface ocean 44 Alpha Centauri 44 occultations 44 ARRL AMSAT 44 heliopause 44 RXTE 44 remote sensing instruments 44 launchpad #A 44 XO 3b 44 NASA Stratospheric Observatory 44 Scramjet 44 Endeavour docked 44 flyby 44 Earth Asteroid 44 Minotaur IV 44 NASA EPOXI mission 44 aboard SpaceX Falcon 44 impactor 44 astrometry 44 Kuiper belt objects 44 cosmonauts Sergei Volkov 44 perigee closest 44 X ray observatories 44 heaviest payloads 44 Hot Jupiters 44 stabilizing gyroscopes 44 NASA Cassini 44 Zhang Jianqi 44 Epsilon Aurigae 44 Giove B 44 Shuttle Atlantis undocks 44 exosolar planets 44 X ray telescopes 44 AERONET 44 Astronaut Leroy Chiao 44 four spinning gyroscopes 44 Hubble Space Telescope HST 44 Roman Romanenko 44 exoatmospheric kill vehicle 44 W2A satellite 44 Constellation Ares 44 Shuttle Docks 44 Taurus XL 44 Itokawa asteroid 44 Pete Theisinger 44 Launch Abort System 44 Martian dust 44 INSAT 4C 44 Sevastyanov 44 magnetosphere 44 LRO spacecraft 44 protoplanetary disk 44 Explorer WISE 44 Distant galaxies 44 Nasa Jet Propulsion 44 Gliese #e 44 lunar soil 44 scramjet 44 gravitational lenses 44 MARSIS radar 44 supergiant star 44 Perminov 44 CEV 44 Zenit 3SL rocket 44 Hayabusa probe 44 starburst galaxy 44 Mars Atmosphere 44 Plane OSP 44 Crawler Transporter 44 Kwajalein Island 44 Rosetta orbiter 44 ballistic trajectories 44 Antenna LISA 44 unmanned Progress 44 unmanned airships 44 engineer Oleg Kononenko 44 Sensing Satellite 44 constellation Eridanus 44 NextSat 44 HEO payload 44 OSTM Jason 2 44 extravehicular activities 44 orbiting remnant 44 Gamma rays 44 H IIB 44 Shenzhou orbital modules 44 Eta Aquarid meteor shower 44 telescope orbits 44 docked flawlessly 44 km perigee 44 Martian equator 44 Exploration Vehicle CEV 44 Discovery payload bay 44 NASA STEREO 44 rocketship 44 Kuiper Belt Objects 44 galaxy M# [002] 44 Planck satellite 44 KA SAT satellite 44 planetary atmospheres 44 Eutelsat KA SAT 44 umbral shadow 44 northern latitudes 44 Discovery STS 44 TrES 4 43 ray Space Telescope 43 CBERS 2B 43 waxing crescent 43 robotic landers 43 Sacred Vessel 43 ST5 43 Saturnian moon 43 aboard Atlantis