Related by context. Frequent words. (Click for all words.) 44 Mars rovers Spirit 44 ion propulsion 44 fabled Northwest Passage 44 robotic spacecraft 43 robotic explorers 43 New Horizons spacecraft 43 spacecrafts 43 perilous 43 interplanetary spacecraft 42 interplanetary 42 orbiting Saturn 42 robotic probes 42 ship 42 Hokule'a 42 ships 42 transatlantic voyage 42 spacecraft 41 NASA Mars rover 41 orbit insertion 41 planetary 41 treacherous waters 41 Messenger spacecraft 40 Dragon capsule 40 dockings 40 oceangoing 40 choppy waters 40 rover Spirit 40 cargo ships 40 spaceship 40 container ships 40 geostationary orbit 40 nanosatellite 40 geosynchronous orbit 40 outer planets 39 Drake Passage 39 lunar orbit 39 Oceansat 2 39 navigating 39 cataclysm 39 geostationary satellite 39 voyaging 39 Orion spacecraft 39 torpedo tubes 39 starship 38 Canadarm2 38 voyage 38 circular orbit 38 Aegis radar 38 Tanegashima Space Center 38 Port Canaveral Fla. 38 ocean liner 38 Galileo spacecraft 38 thrusters 38 voyages 38 stormy seas 38 GOCE 38 Charybdis 38 unpiloted 38 treacherous seas 38 Starship Enterprise 38 factory ship Nisshin 38 Aegis destroyer 38 successfully navigated 38 Mars rover 38 deepest recession 38 MetOp 37 NASA Stardust spacecraft 37 SMOS 37 clipper ships 37 starships 37 hurtling towards 37 transoceanic 37 Resourcesat 2 37 rockiest 37 intergalactic 37 transits 37 Mars orbiter 37 Titantic 37 payloads 37 clipper ship 37 Earth orbit 37 Ishimura 37 Cassini orbiter 37 radar altimeter 37 navigates 37 unpowered 37 mightiest 37 powerful particle accelerator 37 Launch Pad #B 37 sails 37 Discovery payload bay 37 shakedown cruise 37 Tugboats 37 interstellar 37 hurtles toward 36 propeller shaft 36 elliptical orbit 36 Ushuaia Argentina 36 Mars Pathfinder 36 winches 36 maiden voyage