So far, what is the furthest space exploration machines have been able to reach in the universe? Thanks.
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1Duplicate question: http://space.stackexchange.com/q/3010/265 . – Mark Adler May 30 '16 at 23:42
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Thanks, I did not know Voyager one from 1977 was still around. – Jack Maddington May 31 '16 at 08:09