The Voyager space launch in 1977 is one of humankind?s greatest achievements. More than twelve billion miles away, a tiny spaceship is leaving our Solar System and entering the void of deep space ? the first human-made object ever to do so. Slowly dying within its heart is a nuclear generator that will beat for perhaps another decade before the lights on Voyager finally go out. But in all likelihood, Voyager will probably outlive humanity.