Voyager 1 nears a milestone: one light-day from Earth

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NASA has published an explainer on the 'light-day,' a unit of distance equal to how far light travels in one day. Voyager 1, the spacecraft launched in 1977, is approaching the point where it will be a full light-day away from Earth. The article uses this measure to help readers grasp the vast distance the probe has covered. Voyager 1 remains one of the most distant human-made objects and is still transmitting data from interstellar space. The piece is hosted on NASA's science site, and the story gained attention on Hacker News with about two dozen points.

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