Related by context. Frequent words. (Click for all words.) 45 NASA Astronaut 44 Paolo Nespoli 43 astronauts 43 NASA astronaut 43 shuttle missions 42 Mercury Gemini 41 Astronaut 40 spaceflights 40 Mission Specialists 40 astronaut 40 Apollo astronauts 39 Robert Behnken 38 space shuttle 38 Christer Fuglesang 38 NASA Space Shuttle 37 shuttle Challenger 37 Astronauts 37 Heidemarie Stefanyshyn Piper 37 Shuttle astronauts 37 Soichi Noguchi 37 Christa McAuliffe backup 37 Russian cosmonaut 36 spaceflight 36 Cernan 36 Frank De Winne 36 teacher Christa McAuliffe 36 John Grunsfeld 36 astronaut Paolo Nespoli 36 Sandra Magnus 36 NASA 36 Mikhail Kornienko 36 Commander Eileen 36 6 #/#-hour spacewalk 35 Ilan Ramon 35 Discovery astronauts 35 Nicole Stott 35 Rick Husband 35 Buzz Aldrin 35 Yuri Gagarin 35 Space Shuttle Discovery 35 Space Shuttle 35 June Scobee Rodgers 34 Caldwell Dyson 34 Kalpana Chawla 34 Grunsfeld 34 International Space Station 34 Edwin Buzz Aldrin 34 shuttle Discovery 34 Peggy Whitson 34 Garrett Reisman 34 cosmonauts 34 Atlantis astronauts 34 spacewalks 34 Nasa 33 Andrew Feustel 33 Stephen Frick 33 Lee Archambault 33 Space Shuttle Columbia 33 Wakata 33 Greg Chamitoff 33 Astronauts aboard 33 Eric Boe 33 astronauts aboard 33 shuttle Atlantis 33 Endeavour astronauts 33 Fuglesang 33 Leroy Chiao 33 Acaba 33 Spaceflight 33 spacewalking astronauts 33 space shuttle Discovery 33 Arctic explorer 33 spacewalking 32 Eileen Collins 32 Flight Engineer 32 Skylab 32 space shuttles 32 cosmonaut 32 spacewalker 32 Hubble servicing 32 Simonyi 32 Sturckow 32 Krikalev 32 Oleg Kotov 32 shuttle 32 STS 32 Nespoli 32 Scott Parazynski 31 Doug Wheelock 31 human spaceflight 31 Tony Antonelli 31 astronaut Buzz Aldrin 31 aboard Endeavour 31 Yurchikhin 31 Alan Shepard 31 NASA Kepler 31 Space Shuttle Program 31 profoundly influenced 31 Space Shuttle Endeavour 31 astronaut Yang Liwei 31 Foale