Related by context. Frequent words. (Click for all words.) 54 SpaceShipOne 49 Rutan 45 Eileen Collins 44 spacecraft 43 weightlessness 42 Chealander 42 spaceship 41 Leinbach 41 liftoff 41 Fincke 41 thruster 41 Gagarin 41 Gerstenmaier 40 space shuttle Discovery 40 orbit 40 Piccard 40 NASA Jet Propulsion 40 Nasa 40 Fossett 40 Mission Control 39 X #A 39 NASA Jet Propulsion Laboratory 39 Diamandis 39 Burt Rutan 39 astronaut 39 Scaled Composites 39 Rossy 39 Space Shuttle Discovery 38 SpaceX 38 orbiter 38 Ansari X 38 spaceflight 38 Hawking 38 zero gravity 38 manned spaceflight 38 Parazynski 38 Kennedy Space 37 NASA 37 Melroy 37 takeoff 37 Jet Propulsion Laboratory 37 gyroscopes 37 thrusters 37 X #B 37 Bolden 37 copilot 37 spacewalker 37 Musk 36 shuttle Discovery 36 NASA Administrator 36 Solar Impulse 36 director Mike Leinbach 36 Sullenberger 36 Cape Canaveral 36 Flight controllers 36 Sriharikota 36 space shuttle Atlantis 36 Endeavour 36 space shuttle Endeavour 36 Mike Fincke 35 Huygens 35 ISRO 35 airspeed 35 space shuttle 35 Wrights 35 Cape Canaveral Fla. 35 suborbital 35 Baikonur cosmodrome 35 CAPE CANAVERAL Fla. 35 SpaceShipTwo 35 spacewalkers 35 astronauts 34 Cape Canaveral Air Force 34 Cassini 34 cockpit 34 Soyuz capsule 34 taxied 34 Hayabusa 34 Stanger 34 Zhai 34 Dittemore 34 Chandrayaan 34 spacewalk 34 glider 34 Renslow 34 Simonyi 34 weightless 34 Polansky 34 X Prize 34 Space shuttle Discovery 34 Space shuttle Endeavour 34 orbital 34 lander 33 Discovery astronauts 33 hypersonic 33 Aldrin 33 White Sands Missile 33 SpaceDev 33 Mark Shuttleworth 33 Chang'e 33 Space shuttle Atlantis