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Voyager 1 passes another milestone: It's now 138AU from home

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So which is it?

on Tuesday it reached 138 astronomical units from Earth...

...we noticed the “Miles Since Left Planet” counter tick over...

Distance from Earth, or miles travelled?

As it happens, the exact numbers for both Voyager craft are here, which also states:

Note: Because Earth moves around the sun faster than Voyager 1 is travelling from Earth, the distance between Earth and the spacecraft actually decreases at certain times of the year.

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