Flandro identifies a four-planet gravity-assist opportunity

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Working at the Jet Propulsion Laboratory, Gary Flandro examined the future positions of the outer planets and found that Jupiter, Saturn, Uranus and Neptune would be arranged in the late 1970s so that a single spacecraft could be handed from one to the next by gravity assist. The result was not a new technique but a dated constraint: the geometry would close, and would not repeat for well over a century.

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