From BBC News:
The Voyager-1 spacecraft has become the first manmade object to leave the Solar System.
Scientists say the probe’s instruments indicate it has moved beyond the bubble of hot gas from our Sun and is now moving in the space between the stars.
Here’s hoping we don’t see it in a few hundred years calling itself “V’Ger”.
Update: According to a Reddit AMA with the Voyager mission team, it has actually entered Interstellar space and not left the Solar System, as reported by most news outlets.