From Gizmodo
Voyager 1 Is Approaching a Full Light-Day From Earth—and It Just Scared the Crap Out of NASA

Voyager 1 is nearing one light-day away from Earth, when radio signals will take 24 hours to travel between Earth and the spacecraft.
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Voyager 1 is nearing one light-day away from Earth, when radio signals will take 24 hours to travel between Earth and the spacecraft.