Voyager 1 will reach a new milestone in November 2026: it will be so far from Earth that a radio signal travelling at the speed of light will take a full 24 hours to reach it — a distance humanity’s most distant spacecraft crossed in just over 49 years of continuous flight.

In November 2026, Voyager 1 will cross a boundary that is not marked by dust, plasma, gravity or any visible edge. It will become a spacecraft one full light-day from Earth. NASA now lists the moment as Wednesday, November 18, 2026, at 2:16:07 a.m. PST. At that point, a radio command leaving Earth will need [...] The post Voyager 1 will reach a new milestone in November 2026: it will be so far from Earth that a radio signal travelling at the speed of light will take a full 24 hours to reach it —