Comment Re:satellites (Score 3, Informative) 403
The Voyager RTGs are decaying, NASA expects output power to drop below the point where it can keep a single instrument going around 2025.
The Pioneers are already long past the point where they can't send a strong enough signal to be detected.
The latest nuclear power plants for the US Navy have been designed to run without refueling for the life of the ship. That's 50 years for aircraft carriers, so the USS Gerald R Ford (CVN 78) is capable of functioning until 2065. Now I don't know how stable a nuclear power plant is when left on its own, but potentially this'll live much longer than the Voyagers.