...1950s. On May 5, 1961, astronaut Alan B . Shepard Jr. became the ...another vehicle in space was possible, and gathering medical data on the effects of weightlessness on humans...
5 Answers · Science & Mathematics · 07/09/2006
...1950s. On May 5, 1961, astronaut Alan B . Shepard Jr. became the ...another vehicle in space was possible, and gathering medical data on the effects of weightlessness on humans...
5 Answers · Science & Mathematics · 07/09/2006