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(Click for frequent words.) 66 NASA rovers 59 durable twin rovers 59 rovers 58 robotic rovers 57 Mars landers 57 twin rovers 56 rovers Spirit 55 Nasa spacecraft 55 twin rovers Spirit 55 NASA rovers Spirit 55 Martian rovers 54 NASA twin rovers 53 planets orbiting sun 53 Saturn Cassini 52 reconnaissance orbiter 52 twin rover Opportunity 52 THEMIS satellites 52 unmanned probes 51 Martian craters 51 Voyager probes 51 hexagonal mirrors 51 stationary lander 51 robot rovers 51 rover Opportunity 51 airbursts 51 Mars rovers 51 Galilean satellites 51 Stardust spacecraft 51 lander 50 spacecrafts 50 NASA rover Spirit 50 LCROSS spacecraft 50 orbiting telescopes 50 icy comets 50 simulated lunar 50 Viking landers 50 occultations 50 exoplanets orbiting 50 Mars rovers Spirit 50 rover Sojourner 50 Curiosity rover 50 planemos 50 orbiting spacecraft 50 Viking Lander 50 retroreflector 50 Lander robotic arm 50 Martian terrain 50 Reconnaissance Orbiter 50 Lunar Reconnaissance Orbiter Camera 50 giant gaseous planets 50 wheeled rover 49 Trojan asteroids 49 lunar orbits 49 HiRISE camera 49 Martian crater 49 Kepler spacecraft 49 lobate scarps 49 lander rover 49 reentry capsule 49 Jovian moons 49 Martian plains 49 millisecond pulsars 49 Titan flybys 49 lunar landers 49 Opportunity rover 49 moons orbiting Pluto 49 asteroid Steins 49 sols 49 moonwalkers 49 spacecraft 49 merging galaxies 49 infrared telescopes 49 lunar rovers 49 Deep Impact flyby spacecraft 49 Mars orbiters 48 rover Spirit 48 orbiting observatories 48 Voyager spacecraft 48 robotic explorer 48 satellites orbiting Earth 48 flyby spacecraft 48 shepherding spacecraft 48 grueling spacewalks 48 celestial observations 48 Endurance crater 48 legged lander 48 Martian surface 48 elongated orbits 48 GRACE satellites 48 outermost planets 48 wounded squatted helplessly 48 carry heavier payloads 48 COROT exo 3b 48 Enceladus flybys 48 Sojourner rover 48 icy moons 48 Lunar Reconnaissance Orbiter LRO 48 lunar probes 48 phyllosilicates 48 tumbleweed rover 48 robotic geologists 48 lunar meteorites 48 Churyumov Gerasimenko 48 WISE spacecraft 48 robotic probes 48 Ring Nebula 48 HiRISE images 48 optical telescopes 48 Stratellite 48 Epsilon Eridani 48 orbiters 48 Stardust capsule 48 KBOs 47 lunar missions 47 Opportunity rovers 47 comet Boethin 47 Pleiades cluster 47 NASA Cassini 47 moons orbiting 47 rock outcrop 47 Comet #P/Churyumov-Gerasimenko 47 SpaceShip Two 47 highly elliptical orbits 47 robotic landers 47 containers crushed Gatica 47 lunar equator 47 circular orbits 47 X #As 47 interacting galaxies 47 flyby Cassini 47 NASA rover Opportunity 47 unmanned spacecraft 47 rover 47 planetary flybys 47 asteroids WISE 47 F/A-#A Hornets 47 Bonneville Crater 47 Beta Pictoris b 47 Martian landscape 47 spacewalking astronauts rewiring 47 gaseous planets 47 robotic rover 47 Upsilon Andromedae b 47 robotic spacecraft 47 planetary surfaces 47 Mars Gusev Crater 47 dust devils 47 dexterous robots 47 THEMIS probes 47 NASA Spirit rover 47 frequent woo hoos 47 planets orbiting distant 47 planets orbits 47 Jupiter flyby 47 Meridiani plains 47 Super Earths 47 red harvester ants 47 transiting planets 47 neutrino detectors 47 Hellfires 47 Viking orbiters 47 planet Gliese #g 47 microscopic imager 46 lunar soil 46 orbiter lander 46 Stratellite tm 46 satellites orbiting 46 simulated Martian 46 microshutters 46 motorized rasp 46 parafoil 46 meteoroids 46 synchrotron x ray 46 Gusev crater 46 telescopes 46 APXS 46 twin Voyager spacecraft 46 WISE telescope 46 THEMIS spacecraft 46 spaceports 46 comet Churyumov Gerasimenko 46 pneumatic catapult 46 NASA Kepler telescope 46 OGLE TR #b 46 Upsilon Andromedae 46 robotic lander 46 satellites orbiting Mars 46 highly elliptical orbit 46 gamma ray detectors 46 microbots 46 rover panoramic 46 Martian equator 46 planets circling 46 super Earths orbiting 46 sunlike star 46 meter Keck telescopes 46 lunar orbiters 46 Orbiter MRO 46 geostationary orbits 46 Foton spacecraft 46 planets orbiting 46 asteroid flyby 46 comets asteroids 46 Mars moon Phobos 46 asteroid Eros 46 Comet Hartley 46 flybys 46 martian landscape 46 Pluto Charon 46 Saturn moons 46 robotic Canadarm 46 micrometeoroids 46 inflatable tubes 46 Martian arctic plain 46 scramjets 46 Solar TErrestrial RElations Observatory 46 robotic explorers 45 pointings 45 moons Phobos 45 Global Surveyor 45 parachutes malfunctioned 45 Nasa Mars Reconnaissance 45 nanosatellites 45 spacewalks astronauts 45 Apollo missions 45 whiz harmlessly 45 comet particles 45 robotic geologist 45 thruster rockets 45 unpiloted aircraft 45 Messenger spacecraft 45 UPS Anchorage Alaska 45 extrasolar planets 45 twin rover Spirit 45 HiRISE camera aboard 45 Shenzhou spacecraft 45 ferry SpaceShipTwo 45 Shenzhou capsules 45 Martian lander 45 sized planets orbiting 45 orbiting Mars 45 miniature ovens 45 UTTR 45 bedrock outcropping 45 asteroids 45 earthlike planets 45 Opportunity Mars rover 45 retrorockets 45 protoplanets 45 laser altimeter 45 meter Keck telescope 45 spacewalking chores 45 Martian winters 45 SBSS Block 45 Mars Odyssey orbiter 45 Mars Pathfinder lander 45 CubeSats 45 exo planets 45 LRO spacecraft 45 Perseus Cluster 45 impactors 45 planets astronomers 45 Konacki 45 Keck telescopes 45 polar orbits 45 twin Mars rovers 45 spacewalking astronauts floated 45 ion thrusters 45 orbiter robotic arm 45 volcano Olympus Mons 45 Kuiper belt objects 45 telescopes astronomers 45 Zeta Ophiuchi 45 robotic telescopes 45 Martian arctic 45 NASA Gamma ray 45 polygon patterns 45 Comet Churyumov Gerasimenko 45 Globalstar satellites 45 martian rocks 45 Mars Lander 45 ESA Huygens probe 45 Cassini flybys 45 moon Charon 45 Hubbles 45 HIRES spectrometer 44 northern arctic plains 44 NASA satellites orbiting 44 Odyssey orbiter 44 sailplanes 44 FASTSAT 44 navigate autonomously 44 horsepower outboard engines 44 quadrocopter 44 Galilean moons 44 comet Wild 44 orbital rendezvous 44 comet #P/Churyumov-Gerasimenko 44 Mars Reconnaissance Orbiter MRO 44 CSAMT MT survey 44 lunar regolith 44 Percheron horses pulled 44 SIM PlanetQuest 44 refractors 44 martian soil 44 geostationary satellites 44 planetary nebulae 44 moonlets 44 arctic plains 44 Minotaur rocket 44 spacecraft orbiting 44 inner asteroid belt 44 orbiting 44 asteroids orbiting 44 STEREO spacecraft 44 MESSENGER spacecraft 44 dimensional holographic 44 long asteroid Hayabusa 44 orbits 44 Saturnian moon Titan 44 Iridium satellites 44 Jupiter moons 44 Mars orbiter 44 Deep Impact craft 44 synchronous orbit 44 Deep Impact probe 44 planets asteroids 44 spaceflyers 44 EPOXI 44 Context Camera 44 Stardust mothership 44 geosynchronous satellites 44 Red Rectangle 44 orbiters landers 44 LightSail 1 44 SpaceLoft XL rocket 44 Saturnian moons 44 Hubble observations 44 Solar Terrestrial Relations 44 zap boulders 44 SSMEs 44 exoplanetary 44 NanoSail D 44 Moessbauer spectrometer 44 Purgatory Dune 44 Canadian Julie Payette 44 observatories 44 Venusian surface 44 super Earths 44 spiral galaxy Messier 44 unmanned airships 44 Samuel Oschin Telescope 44 Comet Hartley 2 44 microlensing events 44 martian surface 44 GJ #b [002] 44 Compton Gamma Ray 44 magnetospheres 44 Earth asteroids 44 Titan flyby 44 Merlin 1C engines 44 Mars Orbiter Camera 44 aeroshell 44 whirlybirds 44 parabolic dishes 44 rover Spirit landed 44 experienced spacemen 44 Interior Laboratory GRAIL 44 gravitationally bound 43 Saturn Jupiter Uranus 43 permanently shadowed regions 43 Philae lander 43 Epoxi 43 Diviner 43 Globalstar constellation 43 New Horizons spacecraft 43 NextSat 43 RSRMs 43 Gusev Crater 43 Toutatis 43 planets orbiting stars 43 impactor 43 asteroid 43 outer planets 43 NASA Opportunity rover 43 Bramley Murton 43 spaceships 43 comets orbiting 43 Cassini Huygens 43 rotational axis 43 robotic rover Spirit 43 Mars Reconnaissance Orbiter 43 Earthlike planets 43 Martian dust 43 lunar crust 43 astronomical observations 43 interplanetary missions 43 exoplanets 43 KillerBee 43 LROC 43 Mars Pathfinder 43 Orion nebula 43 thrusters 43 GEO satellites 43 Stickybot 43 axial tilt 43 Shenzhou capsule 43 brown dwarfs stellar 43 moon Phobos 43 gravitational microlensing 43 celestial objects 43 Rosetta lander 43 Olympus Mons 43 fairing atop 43 Deep Impact eXtended Investigation 43 interstellar dust grains 43 Aegis warships 43 Stryker brigades 43 magnetars 43 Atlantis undocks 43 slender crescent 43 X ray telescopes 43 orb weaving spiders 43 NASA Cassini spacecraft 43 orbiting Hubble Space Telescope 43 BSMs 43 Terrestrial Planet Finder 43 Ben Stiller Ricky Gervais 43 Geminga 43 extravehicular activities 43 satellites 43 NASA MESSENGER spacecraft 43 asteroid Vesta 43 NASA Stardust spacecraft 43 SkyCenter 43 dirty snowballs 43 johnboats 43 HM Cancri 43 Hematite Slope 43 Carina constellation 43 inch refractor telescope 43 Cassini flyby 43 Kuiper belt object 43 Lockheed Martin A# geosynchronous 43 ExoMars rover 43 spacewalks Atlantis astronauts 43 GSLV rockets 43 NASA Lunar Reconnaissance 43 orbiting Saturn 43 dimensional atlas 43 Rosetta spacecraft 43 Shenzhou VI craft 43 Jupiter Ganymede 43 planetary transits 43 GJ #b [001] 43 Crawler Transporter 43 Earth Observation satellites 43 gaseous planet 43 NASA Voyager spacecraft 43 crawler transporter 43 gravitational lenses 43 Foton M2 43 Kwajalein Island 43 compressed nitrogen 43 microsatellites 43 NEOSSat 43 comet flyby 43 luminous galaxies 43 Mars rover Opportunity 43 IBEX spacecraft 43 Chodas 43 extrasolar planets orbiting 42 gliders 42 Galileo satellites 42 planets 42 NASA Cassini orbiter 42 constellation Hercules 42 humanoid robot bound 42 spacecraft Cassini 42 HiRISE image 42 elliptical orbits 42 Sun synchronous orbit 42 hematite mineral 42 Landsat satellites 42 LAGEOS 42 planetary nebulas 42 hypersonic jet 42 X ray binary 42 copper impactor 42 NASA ICESat 42 minisub 42 Martian rocks 42 rover robotic arm 42 sunlike stars 42 LISA Pathfinder 42 Mars Opportunity rover 42 copper fortified impactor 42 Ares IX rocket 42 Saturnian 42 galactic clusters 42 Martian orbit 42 Lockheed Martin Waterton Canyon 42 SPHERES 42 substorms 42 Red Planet 42 Mössbauer 42 SIRTF 42 extrasolar 42 brown dwarfs 42 mothership WhiteKnightTwo 42 lensing galaxy 42 Shuttle Endeavor 42 micrometeorite impacts 42 Okmok Caldera 42 CoRoT 7b 42 MARSIS 42 RRATs 42 six wheeled rover 42 manned Soyuz 42 EPOXI mission 42 hypervelocity stars 42 asteroid Itokawa 42 rocky planets 42 orbiting astronauts 42 polar craters 42 moon Deimos 42 piggybacked Huygens probe 42 martian 42 robotic submersibles 42 LRO 42 constellation Scorpius 42 asteroids comets 42 CALIPSO 42 spacemen Timothy Kopra 42 steering wheel tilts 42 Astrobotic 42 Cosmonaut Yuri Shargin 42 planetary embryos 42 SpaceX Dragon capsule 42 Keck telescope 42 Comet Boethin 42 airfoils 42 Cepheid variables 42 NFIRE 42 landers 42 solar radii 42 spectrographs 42 interstellar dust particles 42 orbital maneuvers 42 Crewmate Tracy Caldwell 42 Delta Cephei 42 Valles Marineris 42 gamma ray spectrometer 42 X ray observatories 42 Particle accelerators 42 Fomalhaut b 42 INSAT 4CR 42 interstellar grains 42 alien spaceships 42 Mars 42 MSL rover 42 Quadrantid meteor shower 42 Jean Luc Margot 42 Climate Experiment GRACE 42 peaks Batian 42 gamma ray observatory 42 regolith 42 Herschel Planck 42 afterglows 42 O OREOS 42 Ulysses spacecraft 42 WASP #b 42 Titan 4B 42 Yinghuo 1 42 star Gliese 42 lander robotic arm 42 Spacewalks 42 EZ Rocket 42 ST5 42 particle detectors 42 Canadarms 42 retrograde orbit 42 constellation Carina 42 ballistic trajectory 42 DEPTHX 42 NASA Mars Reconnaissance 42 Jonathan Lunine 42 Rutan SpaceShipOne 42 MARSIS radar 42 LORRI 42 SolarEagle 42 Mars northern latitudes 42 GLAST spacecraft 42 aperture telescope 42 Deep Impact spacecraft 42 Benthic Rover 42 THAAD interceptors 42 NASA Kepler spacecraft 42 spacewalk Lopez Alegria 42 spinning gyroscopes 41 BepiColombo 41 Spirit rover 41 Apollo astronauts 41 microgravity experiments 41 penetrating radar 41 cometary debris 41 Martian meteorites 41 impactor spacecraft 41 moons orbiting Saturn 41 telescopic camera 41 round window unshuttered 41 Doohan ashes 41 breadbox sized 41 Antennae Galaxies 41 wheeled robot 41 Earth orbiting satellites 41 supercomputer simulations 41 high altitude airship 41 ionised gas 41 TDRS satellites 41 lunar poles 41 Ikonos 41 Submillimeter Array 41 SDSS telescope 41 Hellas Basin 41 Foton M3 spacecraft 41 Landsat satellite 41 Foton M3 41 SpaceShipTwo 41 heavier payloads 41 Chilean Atacama Desert 41 cinder cones 41 rocket boosters 41 Streep Philip Seymour 41 Russian Valeri Polyakov 41 SOLO TREC 41 ballistic trajectories 41 Great Observatories 41 RS Ophiuchi 41 LEO satellites 41 Tempel 1 41 situ measurements 41 Lovell Telescope 41 Healthy BMIs 41 #st Airborne combat brigades 41 orbital velocity 41 supersonic combustion ramjet 41 colliders 41 airglow 41 hypersonic speeds 41 Eridanus 41 layered bedrock 41 submersible Alvin 41 orbiter 41 nanosatellite 41 Comet Tempel 1 41 twin Keck telescopes 41 Shuttle Discovery blasts 41 # Apophis 41 Cerro Pachon 41 micrometeorite 41 polar orbiting satellites 41 rocket thrusters 41 cosmic ray collisions 41 motherships 41 Global Surveyor spacecraft 41 orbit GEO 41 exosolar planets 41 TrES 4 41 GOES satellites 41 Lake Vostok 41 optical microscope 41 GJ#b 41 STEREO mission 41 dimensional seismic 41 ecliptic plane 41 Regolith 41 TEGA oven 41 Cancri e 41 NASA Mars rover 41 shadowed craters 41 glitzier cousins 41 payload fairings 41 Inters MORE 41 Glonass navigation satellites 41 orbiting Kepler telescope 41 Mars rover 41 ESO telescopes 41 mu Arae 41 Mars Odyssey spacecraft 41 Horizons spacecraft 41 electric ion propulsion 41 Permanent Multipurpose Module PMM 41 moonbase 41 Pegasus XL 41 orbital 41 rope tows 41 moon Io 41 Mars Surveyor 41 interferometers 41 Orbiter LRO 41 Rover MER 41 Pleiades star 41 Seaglider 41 NROL 41 coronal loops 41 Roadster Tesla 41 ionized gas 41 irregularly shaped asteroid 41 exoplanets planets 41 Chajnantor plateau 41 Orionids 41 Kepler Telescope 41 cushioned feathery landing 41 mosque minaret taller 41 Trifid 41 WISE mapped 41 clumpy soil 41 hydrated minerals 41 meteor showers 41 TDRS K 41 Cassini orbiter 41 payloads 41 circumstellar disks 41 ROCSAT 2 41 manned missions 41 Michibiki 41 astronauts 41 stargates 41 Martian rover 41 Shuttle Endeavour blasts 41 orbiting satellites 41 lunar craters 41 projectiles veered 41 Mossbauer spectrometer 41 interstellar particles 41 OSIRIS REx 41 called gravitational microlensing 41 Opportunity parachuted 41 inflatable kayaks 41 equatorial plains 41 Comet Halley 41 gamma ray telescopes 41 Chile horns honked 41 Saturn moons Enceladus 41 robotic arm 41 Terra Meridiani 41 Spirit Mars rover 41 Hawaii Mauna Kea 41 moon Europa 41 geosynchronous orbit 41 Heliospheric Observatory SOHO 41 Kuiper Belt object 41 NEAs 41 crewed spacecraft 41 starshade 41 Robotic Arm Camera 41 vast Gusev Crater 41 Hang gliders 41 Syrtis Major 41 rappel tower 41 planetesimals 41 red supergiants 41 telescopes atop Mauna 41 circumstellar disk 41 Flyby spacecraft 41 Lunokhod 41 autonomous underwater 41 float weightlessly 41 lunar rover 41 MN4 41 heaviest payloads 41 remote sensing satellite Resourcesat 41 station NFAA 41 constellation Cassiopeia 41 Soyuz capsules 41 Discoverys 41 Descent Imager Spectral Radiometer 41 Cat Paw Nebula 41 NASA Lunar Prospector 41 radioisotope thermoelectric generator 41 Spitzer infrared 41 comets meteors 40 laser altimetry 40 AB Aurigae 40 Perseid meteors 40 THEMIS Images 40 constellation Andromeda 40 SMBHs 40 EPOXI spacecraft 40 planetary geologists 40 Nautile 40 MQ 9s 40 spacewalks 40 Hayabusa capsule 40 NASA EPOXI mission 40 Shuttle Atlantis blasts 40 Kraken Mare 40 inhabitable planets 40 Cygnus Lyra region 40 Neptune Uranus 40 Minotaur IV 40 Shuttle undocks 40 spacecraft flyby 40 NFIRE satellite 40 spectrometers 40 spacewalking astronauts hooked 40 ultrasonic motors 40 suborbital spaceships 40 Io Europa Ganymede 40 MG J# +# 40 Endeavour astronauts 40 Galileo spacecraft 40 Noctilucent clouds 40 seven windowed lookout 40 P Churyumov Gerasimenko 40 Cartosat 2B 40 Orbital Express 40 Herschel Space Telescope 40 AUVs 40 LightSail 40 inflatable planetarium 40 Taurids 40 Earth magnetosphere 40 Discovery undocked 40 Titan IVB 40 supervolcanoes 40 parabolic arcs 40 RXTE 40 OSTM Jason 2 40 Erebus Crater 40 skywatching 40 sister rover Spirit 40 Saturn outermost moon 40 starboard SARJ 40 Mini Thermal Emission 40 KODAK CCD Image Sensors 40 spaceward 40 coronal mass ejections CMEs 40 Pancam 40 Solid Rocket Boosters 40 liquefied hydrogen 40 comet nuclei 40 NASA STEREO 40 Manned missions 40 LeConte leh 40 Jupiter Uranus 40 ringed planet 40 Soviet cosmonauts 40 hydrostatic equilibrium 40 gimbals 40 astronomical telescopes 40 Tunguska asteroid 40 hydraulic jacks 40 Lagrangian 40 Mars Orbiter 40 NASA Mars Orbiter 40 Garan rode 40 tetrahedrons 40 Shepherding Spacecraft 40 Lunar Excursion Module 40 Skynet 5C 40 Huygens descent 40 launchpads 40 DMSP F# 40 glider pilots 40 dropsondes 40 Cometary 40 MARSIS instrument 40 comet nucleus 40 Saturn rings 40 Leonid meteor showers 40 constellation Cygnus 40 Vastitas Borealis 40 Cassini 40 WK2 40 Thrusters 40 SpaceShip 40 Argo floats 40 Triangulum 40 Russian Soyuz capsules 40 planet HD #b 40 moon Enceladus 40 LRO LCROSS 40 protoplanet 40 astronomy buffs 40 Desert RATS 40 spaceborne 40 planets moons 40 Shackleton crater 40 hypervelocity 40 Infrared Astronomical Satellite IRAS 40 Epsilon Aurigae 40 ziplines 40 planets Uranus 40 GeneSat 40 Earth orbit 40 pyrotechnic explosions 40 #P/Churyumov-Gerasimenko 40 Ares IY 40 shuttle orbiter 40 microbial ecosystems 40 Small Magellanic Cloud 40 interstellar dust samples 40 Soyuz rockets 40 drogue parachute 40 Rosetta orbiter 40 moon landers 40 Priz AS 40 Quadrantids 40 Sky MAXX 40 COROT 7b 40 NEOWISE 40 Nihoa Island 40 constellation Aquila 40 exoplanet discoveries 40 Manta rays 40 parabolic troughs 40 reusable spacecraft 40 NIRSpec 40 Bowersox Pettit 40 Wolszczan 40 ESA Huygens 40 Ranging spacecraft 40 drogue chute 40 THEMIS 40 Bigelow Aerospace 40 Express orbiter 40 larger sarsen stones 40 SpaceX Dragon spacecraft 40 MAVs 40 dry lakebeds 40 amateur astronomers peering 40 XMM Newton 40 Lunar Reconnaissance Orbiter 40 neutron spectrometer 40 orbits Saturn 40 solar arrays 40 Gamma ray burst 40 Martian polar 40 ALMA antennas 40 Geminids 40 Kitt Peak Observatory 40 habitable planets 40 optical tweezers 40 unpowered landing 40 smallest exoplanet 40 Gliese #d 40 tidal bulge 40 infrared spectrometers 40 spiral galaxy NGC 40 IceCube 40 permanently shadowed craters 40 hubble 40 Atlantis astronauts 40 coronagraph 40 Huygens lander 40 orbiting telescope 40 kg payload 40 astrophysical phenomena 40 spacecraft thrusters 40 infrared ultraviolet 40 exoatmospheric kill vehicle 40 ion propulsion 40 High Altitude Airship 40 Mini TES 40 lander Robotic Arm 40 Frio Sands 40 Dragon capsule 40 spacefarers 40 GOCE satellite 40 gravitational pulls 40 intrinsic brightness 40 TEGA instrument 40 PSLV rocket 40 curved mirrors 40 JIMO 40 SBSS satellite 40 comet McNaught 40 Jet Propulsion Laboratory JPL 40 Cerro Paranal 40 Lunar Roving Vehicle 40 MZ 3A 40 Mars Color Imager 40 Jules Verne ATV 39 arduous spacewalks 39 geo synchronous 39 lunar perigee 39 accretion disks 39 Parajet Skycar 39 KH #D 39 Scramjets 39 microquasar 39 geo stationary satellites 39 Japan Hayabusa spacecraft 39 permanently shadowed lunar 39 Orbiters 39 thruster firings 39 crater rim