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Voyager 1 reached interstellar space in August 2012 and is the most distant human-made object in existence. .
Launch date: Sept. 5, 1977
The Voyager 2 spacecraft, which has been in operation since 1977 and is the only spacecraft to have ever visited Uranus and Neptune, has made its way to interstellar space, where its twin spacecraft, Voyager 1, has resided since August 2012. .
Launch date: Aug. 20, 1977