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

Mission engineers at NASA’s Jet Propulsion Laboratory turned off Voyager 1’s cosmic ray subsystem experiment on February 25, and will shut off the low-energy charged particle instrument aboard Voyager 2 on March 24,

NASA engineers are turning off two instruments on Voyager 1 and Voyager 2 to ensure these twin spacecraft can continue exploring interstellar space.