The Pioneer 10 and eleven probes have achieved wonderful distances from earth, at over 120 AU and one hundred AU respectively; but they haven’t been doing actual science for a long time. That is the farthest that any human has ever travelled, however it’s a tiny distance in solar system phrases — just zero.0027 AU, a tenth of a thousandth of the distance to Neptune. Its extremely-elliptical orbit implies that in essentially the most distant a part of its orbit, the place it spends most of its time, it’s farther out than the rest we have seen through our telescopes; however even at this huge distance, it is still not the farthest thing we find out about.
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