No human-made objects have traveled further into the final frontier than Voyager 1 and Voyager 2, but both probes are reaching the end of their service lives

To help them conserve energy, mission operators at the agency's Jet Propulsion Laboratory (JPL) are shutting off one scientific instrument on Voyager 1 and another on Voyager 2. The move will buy both spacecraft a bit of extra time on their journeys through the cosmos.