Related by context. Frequent words. (Click for all words.) 45 Orion spacecraft 45 g 44 weightlessness 39 Dragon capsule 38 sub orbital 37 Orion capsule 37 Hubble servicing 37 suborbital flights 36 zero gravity 36 commander Peggy Whitson 36 space 35 spacesuit 35 Kenneth Ham 35 weightless 35 manned missions 35 suborbital flight 35 taikonauts 35 robotic spacecraft 34 orbit 34 X #A 34 Centennial Challenges 34 lunar missions 34 Shenzhou VI 34 Eric Boe 34 unpowered 34 X #B 34 COROT 34 Sensing Satellite 33 Lee Archambault 33 suborbital 33 Gs 33 microgravity 33 GlobalFlyer 33 geosynchronous orbit 33 Padalka 33 Soyuz rocket 33 JAXA 33 Lunar Crater Observation 33 orbital 33 payloads 33 Discovery payload bay 33 Kononenko 32 Shenzhou VII 32 NASA 32 scramjet 32 lunar exploration 32 astronaut 32 Manned 32 Astronauts aboard 32 gyroscopic 32 Space Shuttle Atlantis 32 spokesman Valery Lyndin 32 Nasa 32 GOCE 32 Kaleri 32 Shuttle Discovery 32 jet propulsion 32 spacecraft 32 Agency JAXA 32 thruster 32 shuttle missions 31 spaceflights 31 ZERO G 31 Roskosmos 31 motion sickness 31 thrusters 31 space shuttle Endeavour 31 MPa 31 Rick Mastracchio 31 muscle atrophy 31 Soyuz 31 Shenzhou 31 Mike Fincke 31 manned spacecraft 31 spacemen 31 Space Station 31 Yurchikhin 31 space shuttle Discovery 31 supersonic 31 centrifugal force 30 Yang Liwei 30 spaceflight 30 Krikalev 30 airlock 30 lunar rover 30 Soyuz craft 30 Space Shuttle Endeavour 30 SPACEHAB 30 Hoshide 30 kN 30 Gregory Chamitoff 30 r t 30 CloudSat 30 Stefanyshyn Piper 30 Bigelow Aerospace 30 Skylab 30 Zero Gravity 30 Russian Soyuz 30 SpaceShipOne 30 polar orbit 30 hypersonic