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[i]In the 1950s Stuhlinger worked at the Redstone Arsenal, where he developed designs for solar-powered spacecraft. The most popular of those designs relied on ion stream vapor emitted by either caesium or rubidium atoms to be accelerated by negatively charged electrodes which would push the ion stream through a propulsion channel. The mechanism would be powered by the one kilowatt of radiant energy that falls on each square meter of space from the sun. He referred to it as a "sunship."
Stuhlinger was director of the space science lab at NASA's Marshall Space Flight Center in Huntsville, Alabama, from 1960 to 1968, and then its associate director for science from 1968 to 1975, when he retired and became an adjunct professor and senior research scientist at the University of Alabama in Huntsville.[/i] — Wikipedia
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