Related by context. Frequent words. (Click for all words.) 55 sub orbital 54 suborbital flight 54 suborbital flights 54 spaceflights 54 unpiloted 54 spacecrafts 53 spaceflight 53 SpaceX Falcon 9 53 manned spaceship 52 Shenzhou VII 52 Peter Diamandis 52 spaceplane 51 lunar missions 51 spaceship 50 manned missions 50 Virgin Galactic 50 manned spacecraft 50 X Prize 50 manned spaceflight 50 spacecraft 49 spaceports 49 astronaut 49 robotic spacecraft 49 VSS Enterprise 48 weightlessness 48 lunar rover 48 Ariane rocket 48 Dragon capsule 48 unmanned lunar 48 Armadillo Aerospace 48 payloads 48 NASA astronaut 48 Shenzhou VI 48 suborbital 48 UP Aerospace 47 suborbital space 47 spaceships 47 Soyuz rocket 47 lunar orbiter 47 Piers Sellers 47 tourist Charles Simonyi 47 Lunar X PRIZE 47 SpaceDev 47 Bigelow Aerospace 47 Soyuz craft 47 zero gravity 47 PSLV C# 47 Spaceflight 46 X PRIZE 46 ZERO G 46 Mike Melvill 46 Shenzhou V 46 unmanned 46 Mars Pathfinder 46 CubeSat 46 hypersonic 46 Yang Liwei 46 NASA Astronaut 45 Space 45 Nasa 45 Earth orbit 45 astronaut Peggy Whitson 45 XCOR Aerospace 45 Scaled Composites 45 hypersonic flight 45 orbit 45 designer Burt Rutan 45 interplanetary spacecraft 45 space 45 Nie Haisheng 45 SpaceShipTwo 45 JAXA 45 Soyuz capsule carrying 45 NASA 45 Oceansat 2 44 ion propulsion 44 astronaut Yang Liwei 44 SpaceShipOne 44 Launch Vehicle 44 scramjet 44 Mars Rover 44 planetary exploration 44 astronauts 44 Burt Rutan 44 outer space 44 blastoff 44 Russian Soyuz rocket 44 unmanned spacecraft 44 human spaceflight 44 SpaceX 44 Ansari X 44 microgravity 44 tycoon Richard Branson 44 Soyuz spacecraft 44 rocketeers 44 spacemen 44 Russian Soyuz spacecraft 44 Orion spacecraft 44 Rocketplane 43 Space Station 43 Zero Gravity