After nearly fifty years, Voyager 1 spacecraft approaches one light-day milestone - 25.9 billion km distance from Earth ensures one day of latency for commands

When you buy through links on our articles, Future and its syndication partners may earn a commission. Voyager 1, the farthest human-made object from Earth, is about to hit one light-day distance from us, or the distance that light travels in a singl... [1979 chars]