Get pedantic about Pioneer's achievements. It was Pioneer 10
in 1983 that past Neptune's orbit. That does not, however, mean that it left the solar system since the solar system is defined by the heliosphere.
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06/11 Greeks seize Troy, 1184BC
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06/11 Sauron attacks Osgilliath (LOTR)
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06/13 Bilbo returns to Bag End (LOTR)
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06/13 Pioneer flies past Neptune, and therefore out of the Solar System
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06/13 Pioneer 10 flies past Neptune's orbit, the first human artifact
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to travel beyond the orbits of all known planets, 1983
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06/14 Sandpaper invented by I. Fischer, Jr., 1834
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06/15 Ben Franklin's kite experiment, 1752
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06/15 Magna Carta signed, 1215
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