A NASA space probe launched in 1977 is about to become the first manmade object to travel beyond the solar system, scientists report.
The Voyager 1 probe, a relic of the beginning of the Space Age, is still alive and kicking, and due to make history any day now. It's hard to tell exactly where the edge of the solar system lies, but scientists say Voyager 1 is measuring clues that suggest it's close.
