At the ragged frontier where the Sun’s influence gives way to interstellar space, Voyager 1 has stumbled into something that sounds more like science fiction than plasma physics: a blisteringly hot ...

Voyager 1, launched in 1977, has traveled farther than any spacecraft in human history. After more than four decades of silent endurance through space, it now sails beyond the orbit of the outer ...

Astronomers are closing in on one of the most tantalizing possibilities in planetary science, evidence that a previously unknown world may be lurking in the outer reaches of the solar system. The ...