NASA’s twin Voyager probes, which launched in 1977, are the longest-running missions to send data home. But as their power supplies wane, scientists are saying goodbye to one instrument on each spacec

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,