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The first spacecraft (Pioneer 10) that had made it outside of Neptune's orbit.
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The first consistently inhabited research station- Mir- USSR.
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The first polar orbit took place around the sun- made possible by both NASA and ESA (European Space Agency).
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NASA used the spacecraft Galileo to orbit Jupiter.
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Working together, NASA, ESU (European Space Union), and ASI (Agenzia Spaziale Italiana) sent Cassini-Huygens into orbit around Saturn.