Related by context. Frequent words. (Click for all words.) 50 Yuri Gagarin 48 Gagarin 48 Neil Armstrong 48 lunar landing 48 moon landings 46 Sputnik moment 46 Cold War 46 Soviets 45 Khrushchev 44 Chandrayaan 44 rocketry 44 Alan Shepard 43 manned spacecraft 43 Skylab 43 spacecraft 43 outer space 42 Soviet 42 ICBM 41 Korolyov 41 Soviet Union 41 manned missions 41 Y2K 41 Taepodong 40 Cuban Missile Crisis 40 Apollo astronauts 40 space shuttle 40 perestroika 40 Nikita Khrushchev 40 manned spaceflight 40 Earthlings 39 USSR 39 orbit 39 NASA 39 human spaceflight 39 orbiting 38 Eisenhower 38 Space Shuttle 38 Pearl Harbor 38 Franklin Roosevelt 38 lunar exploration 38 flying saucers 38 Vostok 38 Apollo 37 Einstein 37 Saturn V 37 sub orbital 37 cosmonaut 37 spaceflight 37 Burt Rutan 37 Adlai Stevenson 37 thermonuclear 37 Soviet communism 37 Space Odyssey 37 Soyuz 37 blastoff 37 Shenzhou 37 Lyndon Johnson 37 Franklin D. Roosevelt 36 spaceship 36 Spaceship 36 Baikonur 36 Planetary Society 36 satellites 36 bombed Pearl Harbor 36 rocket 36 lunar module 36 Dwight Eisenhower 36 Baikonur Cosmodrome 36 X Prize 35 moon 35 Russians 35 GLONASS 35 Space Exploration 35 Bolshevik Revolution 35 Earth orbit 35 LTCM 35 Laika 35 X #A 35 astronauts 35 orbited 35 Jules Verne 35 thrusters 35 Soviet empire 34 Dwight D. Eisenhower 34 lunar probe 34 Cronkite 34 VE Day 34 Chang'e 34 Icarus 34 Space Station 34 Velvet Revolution 34 cosmonauts 34 Space 34 HG Wells 34 astronaut 34 Big Bang 34 interplanetary 33 satellite 33 Mission Control 33 Apophis 33 Barry Goldwater