I would have to say that it's Russia's Sputnik 1. This scared the Americans because Russia now had the ability to launch a nuclear ICBM and they were losing the space race.
Robert Crippen and John Young were on the first Space Shuttle into space, flying the Columbia on April 12, 1981.Young had previously been to space on Gemini 3 in 1965, and to the Moon twice, as...