Related by context. Frequent words. (Click for all words.) 52 NASA astronaut 48 NASA Astronaut 48 astronaut 44 Julie Payette 44 Leland Melvin 44 Metcalf Lindenburger 41 Astronaut 40 Peggy Whitson 40 astronaut Julie Payette 39 Sandra Magnus 38 NASA astronaut corps 38 Linnehan 38 teacher Christa McAuliffe 38 Richard Linnehan 37 Space Station 37 Eileen Collins 36 Commander Peggy Whitson 36 Bob Thirsk 36 NASA 36 Sally Ride 36 Anousheh Ansari 35 Lee Archambault 35 astronaut Peggy Whitson 35 Virts 35 Yang Liwei 35 Space Shuttle Discovery 35 Greg Chamitoff 35 astronaut Buzz Aldrin 35 space 34 Rhodes scholar 34 commander Peggy Whitson 34 Chiao 34 Hobaugh 34 Tim Kopra 34 Sheikh Muszaphar 34 Piers Sellers 34 Shuttle 34 Trailblazing 34 Acaba 34 Christa McAuliffe backup 33 Niki Tsongas 33 Foale 33 Space Shuttle Endeavour 33 Christa McAuliffe 33 Polansky 33 shuttle 33 Shuttle Discovery 33 space shuttle 33 Dan Tani 33 Japanese astronaut Koichi 33 Japanese astronaut Soichi 33 Sunita Williams 33 outer space 33 Alan Shepard 33 spacesuit 33 astronaut Sunita Williams 33 spaceflight 33 Frank De Winne 33 Fincke 33 newly minted 33 Mars Rover 33 astronauts 33 spaceship 33 Sturckow 33 fighter pilot 32 Joan Higginbotham 32 Kalpana Chawla 32 administrator Sean O'Keefe 32 Onetime 32 Shuttle Launch 32 Gregory Chamitoff 32 Paolo Nespoli 32 Eugene Cernan 32 Shuttle astronauts 32 Space 32 BAIKONUR Kazakhstan 32 Cernan 32 Ilan Ramon 32 Eric Boe 32 Alexander Kaleri 32 Mike Melvill 32 Nie Haisheng 32 Andrew Feustel 32 Rex Walheim 32 Soviet cosmonaut Yuri Gagarin 32 Buzz Aldrin 31 Astronaut Buzz Aldrin 31 Leroy Chiao 31 Whitson 31 Edwin Buzz Aldrin 31 microgravity 31 lunar outpost 31 Rhodes Scholar 31 sub orbital 31 Nasa 31 Robert Satcher 31 Aldrin 31 Koichi Wakata 31 Mark Polansky 31 Neil Armstrong 31 Garrett Reisman