For space historians, three years stand out as landmarks of human exploration: 1957, 1961, and 1969. It was in 1957 that the former Soviet Union launched the beeping, beachball-sized Sputnik, becoming ...

May 5 (UPI) --President Donald Trump on Monday celebrated National Astronaut Day on the 64th anniversary of Alan Shepard becoming the first American to go into space. On May 5, 1961, Shepard's Freedom ...