Related by context. Frequent words. (Click for all words.) 61 Commander Eileen 53 NASA astronaut 52 Edwin Buzz Aldrin 51 astronaut 50 NASA Astronaut 50 Astronaut 50 Retired Brig 49 space shuttle 49 Space Shuttle Endeavour 48 Eugene Cernan 48 Shuttle Endeavour 48 Space Shuttle Atlantis 48 astronaut Peggy Whitson 48 Mission Specialists 48 NASA 47 Julie Payette 46 Leland Melvin 46 Space Shuttle Discovery 45 Dryden Flight Research 45 astronaut Julie Payette 44 Eileen Collins 44 Tim Kopra 44 Buzz Aldrin 44 Surayev 44 Soviet cosmonaut Yuri Gagarin 44 ISS Expedition 44 Christa McAuliffe backup 44 Doug Wheelock 43 Shuttle commander 43 Shuttle Atlantis 43 Shuttle Discovery 43 Air Force colonel 43 Retired Maj. Gen. 43 NASA astronaut corps 43 Shuttle astronauts 43 Alexander Kaleri 43 Shuttle Launch 43 Oleg Skripochka 43 CAPE CANAVERAL FL 42 Fyodor Yurchikhin 42 Space shuttle Atlantis 42 Peggy Whitson 42 shuttle Discovery 42 Ares IX rocket 42 Dorothy Metcalf Lindenburger 42 administrator Sean O'Keefe 42 Soyuz capsule carrying 42 Challenger exploded 41 Space shuttle Discovery 41 shuttle 41 spaceflight 41 Marine Corps Lance Cpl 41 Discovery STS 41 space shuttle Discovery 41 Rex Walheim 41 Piers Sellers 41 NASA Kepler 40 Launch Pad #B 40 Japanese astronaut Soichi 40 Space Shuttle 40 Space shuttle Endeavour 40 JOHNSON SPACE CENTER 40 teacher Christa McAuliffe 40 Paolo Nespoli 40 space shuttle Endeavour 40 shuttle Challenger 40 Melroy 40 shuttle Endeavour 40 International Space Station 40 Retired Lt. Gen. 40 Space Shuttle Columbia 40 orbiter 40 Army Pvt 40 Rick Husband 40 Mikhail Kornienko 40 Astronauts 40 Navy aviator 39 Naval Academy graduate 39 Nasa 39 Lee Archambault 39 Commander Peggy Whitson 39 NASA Administrator 39 Russian Soyuz TMA 39 Ilan Ramon 39 astronauts 39 commander Rick Sturckow 39 Arizona congresswoman Gabrielle 39 Nicole Stott 39 Human Spaceflight 39 #th Airlift Squadron [002] 39 shuttle Atlantis 39 Cape Canaveral 39 spacewalker 39 Kenneth Bowersox 39 MSgt 38 Cernan 38 Sally Ride 38 Endeavour 38 Retired Adm. 38 SpaceX Falcon 9 38 Sandra Magnus