Voyager, the iconic twin spacecraft that NASA launched in 1977, are still flying in interstellar space. But their power is dwindling, and it's unclear how much longer they can last. The pioneering Voyager probes might only have a few years left to explore interstellar space, and that's assuming a planned, risky maneuver in 2026 goes well. NASA's twin Voyager 1 and Voyager 2 spacecraft, both running on nuclear power, now have acc... [5650 chars]