35 years after its launch, NASA's Voyager-1 spacecraft has finally left the Solar System -- the first ever man-made object to do so. It will now continue on a course that, in 40,000 years, will take it within 1.7 light years of a star called AC+793888 -- the first man-made object to pass so close to another star, and potentially other planets. Eventually, millions of years from now, Voyager-1 will reach the core of the Milky Way.