If you buy through a BGR link, we may earn an affiliate commission, helping support our expert product labs. Voyager 2 has been exploring interstellar space — the region of space beyond our Sun ...

That doesn't mean it left the solar system, though. Rather, Voyager 1 broke through the heliopause: the area where a "wind" of the sun's high-speed plasma particles grinds to a relative halt.

They are now just outside the heliopause, the boundary marking the end of the sun’s influence and the beginning of the interstellar medium, sometimes called “empty space” but suffused with ...