Related by context. Frequent words. (Click for all words.) 49 Scott Crossfield 48 Gene Cernan 48 Alexander Kaleri 47 Gus Grissom 47 Soviet cosmonaut Yuri Gagarin 47 ISS Expedition 47 Frank Borman 45 Leland Melvin 45 Robert Curbeam 45 cosmonaut Yuri Gagarin 44 Ron Garan 44 Owen Garriott 44 Julie Payette 44 Andrew Feustel 43 Randolph Bresnik 43 Space Shuttle Endeavor 42 Tim Kopra 42 Metcalf Lindenburger 42 NASA astronaut 42 Edwin Buzz Aldrin 42 NASA astronaut corps 42 shuttle Challenger 42 Astronaut Buzz Aldrin 42 Alan Shepard 41 NEEMO 41 Discovery STS 41 Cady Coleman 41 Shuttle astronauts 41 astronaut 40 astronauts 40 Piers Sellers 40 Jared Leroy Mohler 40 Mikhail Tyurin 40 crewmembers aboard 40 teacher Christa McAuliffe 40 Messenger spacecraft 40 Japanese astronaut Koichi 40 Drew Feustel 40 Timothy Kopra 40 astronaut Peggy Whitson 40 Judith Resnik 40 administrator Sean O'Keefe 39 Lee Archambault 39 Gorie 39 Haise 39 Dan Tani 39 Clyde Tombaugh 39 commander Rick Sturckow 39 VSS Enterprise 39 Arizona congresswoman Gabrielle 39 Barbree 39 Mikhail Kornienko 38 Mike Melvill 38 Astronaut Nicole Stott 38 NASA 38 SpaceX Falcon 9 38 Yuri Malenchenko 38 Christa McAuliffe backup 38 Dorothy Metcalf Lindenburger 38 Readdy 38 Sturckow 38 aerobatic pilot 38 NASA Astronaut 38 aboard Atlantis 38 Keir Dullea 38 astronaut Ilan Ramon 38 Russian cosmonaut Yuri Malenchenko 38 Sputnik satellite 38 Zamka 38 Bill Readdy 38 Commander Peggy Whitson 38 Shuttle Discovery 38 Beddia 38 NASA Stardust spacecraft 38 depth eBusiness 38 PSLV C# 37 Zhai Zhigang 37 Mars Pathfinder 37 Joseph Acaba 37 Kalpana Chawla 37 Yuri Gagarin 37 astronaut Buzz Aldrin 37 Joan Higginbotham 37 Shuttle commander 37 Bob Thirsk 37 Mark Polansky 37 Apollo missions 37 Roger Chaffee 37 NYSE ORB 37 Mercury Gemini 37 Astronaut 37 JPL manages 37 Levi Stubbs 37 Nicole Stott 37 NASAs 37 Russian cosmonaut 37 June Scobee Rodgers 37 Koichi Wakata 37 Hubble telescope 36 Cernan 36 crewmates