At the farthest edge of the Sun’s influence, the Voyager probes have stumbled into something that sounds almost mythic: a sheath of gas heated to tens of thousands of degrees, a kind of invisible ...

In late 2026, a spacecraft launched in the 1970s will reach a distance from our planet that once belonged purely to science fiction: one full light-day from Earth. When Voyager 1 crosses that ...

As it heads out of the solar system never to return, the deep space probe Voyager 1 is headed for yet another cosmic milestone. In late 2026, it will become the first spacecraft to travel so far that ...