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History Quiz
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Voyager preparation included a visit to the solar thermal vacuum chamber in JPL's Environmental Test Lab.
7. The Voyager mission, launched in 1977, flew past Jupiter, Saturn, Uranus and Neptune. Voyager 1 and 2 continue to send back data as they head out of the solar system. Their mission was made possible due to:
  A Several trajectory correction maneuvers, programmed by JPL navigators to keep the spacecraft on the correct path.
  B A solar flare, which pushed both spacecraft farther than expected.
  C A once-in-176 year alignment of the planets, which allowed a single spacecraft to visit all four planets.
  D A and C.
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