Related by context. Frequent words. (Click for all words.) 59 shuttle Challenger 55 Space Shuttle Challenger 50 Space Shuttle Columbia 48 Challenger exploded 48 June Scobee Rodgers 48 teacher Christa McAuliffe 47 Christa McAuliffe backup 47 Mars Climate Orbiter 46 space shuttle 46 Haise 45 astronauts 44 Kalpana Chawla 44 Tangshan earthquake 44 Space Shuttle 43 NASA astronaut corps 43 astronaut Ilan Ramon 43 Mars Pathfinder 43 Soyuz capsule 43 Skylab 42 spaceship 42 Mercury Gemini 42 Apollo astronauts 42 NASA 42 Frank Borman 42 Apollo missions 42 Ilan Ramon 42 Ron Garan 42 NASAs 42 Nasa 42 Space Shuttle Discovery 42 Polar Lander 42 Christa McAuliffe 42 spacecrafts 42 Soviet cosmonaut Yuri Gagarin 42 spacecraft 41 Sputnik satellite 41 Rick Husband 41 Dan Tani 41 Vikram Sarabhai 41 Readdy 41 TWA flight 41 cosmonauts 40 TJ Creamer 40 Owen Garriott 40 GSLV D3 40 orbited Earth 40 Shenzhou V 40 TWA Flight 40 Piers Sellers 40 Yuri Gagarin 40 Challenger 40 Soyuz 40 Mars Polar Lander 40 Dennis Tito 40 lunar landings 39 Mars orbiter 39 Kaguya 39 Continental Connection flight 39 Apollo lunar 39 reusable spacecraft 39 crewmembers aboard 39 interplanetary spacecraft 39 Yang Liwei 39 Lunar Prospector 39 Kursk nuclear 39 ISS Expedition 39 Gagarin 39 Wernher von Braun 39 Sean O'Keefe 39 Israeli astronaut Ilan 39 Anousheh Ansari 38 Columbia Accident Investigation 38 Cape Canaveral 38 satellite Sputnik 38 Hindenburg 38 unmanned spacecraft 38 USS Forrestal 38 administrator Sean O'Keefe 38 perished 38 astronaut 38 LCROSS mission 38 Jet Propulsion Laboratory JPL 38 Baikonur Kazakhstan 38 Helios Airways 38 Zhai Zhigang 38 Icarus 38 Shuttle Endeavour 38 Soyuz capsule carrying 38 lunar landing 38 unsurvivable 37 Sosoliso 37 NASA astronaut 37 tragedy 37 Julie Payette 37 Geosynchronous Satellite Launch Vehicle 37 Caldwell Dyson 37 Russian Soyuz spacecraft 37 Captain Sullenberger 37 Sputnik 37 shuttle disintegrated 37 spaceflight