Related by context. Frequent words. (Click for all words.) 51 Bob Thirsk 48 Piers Sellers 48 Foale 47 Buran 46 Gagarin 45 Space Agency 45 spacecraft 45 Zamka 45 astronaut Julie Payette 44 Hadow 44 Chamitoff 44 Kotov 44 Space Shuttle 44 Chertok 44 Solar Impulse 44 Cernan 44 NASA 43 cosmonaut 43 Greg Chamitoff 43 Melvill 43 Ares rocket 43 Yang Liwei 42 lunar module 42 Canadarm 42 spaceship 42 Nasa 42 Scott Parazynski 42 Space Station 42 aboard Endeavour 42 spaceflights 42 NASA Space Shuttle 42 shuttle missions 42 Soyuz rocket 42 Hoshide 42 Polonsky 41 Kaleri 41 Shenzhou V 41 Feustel 41 Kondratyev 41 ICESat 41 NASA Astronaut 41 Roskosmos 41 shuttle Atlantis 41 thruster 41 Vinogradov 41 astronaut 41 Oberg 41 Caldwell Dyson 40 spacecrafts 40 Leroy Chiao 40 cosmonauts 40 Lyndin 40 Russian cosmonaut 40 Mars Rover 40 Simonyi 40 GOCE 40 glider pilot 40 director Holly Ridings 40 Tyurin 40 Shuttle astronauts 40 Tony Antonelli 40 Reisman 40 Fincke 40 manned spacecraft 40 JWST 40 orbiters 40 Sturckow 40 Grunsfeld 40 Yuri Gagarin 40 Linnehan 40 Andrew Feustel 40 Kononenko 40 space shuttle 40 Laliberté 40 Bondar 40 robotic spacecraft 40 astronauts 39 Cassini Huygens 39 space shuttles 39 Rocketplane 39 International Space Station 39 Paolo Nespoli 39 Canadarm2 39 Thirsk 39 Baikonur Kazakhstan 39 orbiter 39 Readdy 39 Stardust spacecraft 39 orbiting telescope 39 shuttle Discovery 39 planetary exploration 39 human spaceflight 39 Kopra 39 Hadfield 39 Perminov 39 Kenneth Ham 38 Oleg Kononenko 38 Peggy Whitson 38 lander 38 Padalka 38 lunar rover