Michael Mercier / Huntsville (Ala.) Times
Ernst Stuhlinger, seen at his Huntsville, Ala., home in 1997, was one of the last surviving German rocket scientists who came to America after World War II and formed the engineering foundation of the nations space program. In the 1950s, he conceived what eventually would become the Hubble Space Telescope. He also spent years exploring the possibilities of electric propulsion ion engines for deep-space travel.
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