13 June 1983: The First Man-made Object to Leave the Solar System

On 13 June 1983 the Pioneer 10 spacecraft flew beyond the orbit of Neptune and so became the first man-made object to leave the solar system. But this was not the only first during its extraordinary mission.

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13 March 1930: Discovery of Pluto Confirmed

On 13 March 1930 astronomers at the Lowell Observatory in Flagstaff, Arizona telegraphed the Harvard College Observatory with the news of the discovery of a new planet, the first since Neptune in 1846. The discovery had been made on 18 February by Clyde Tombaugh less than a year after he had been assigned the task

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