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

Veteran probes close in on the half century More science instruments are being shut down on the Voyager probes as engineers attempt to eke out the power and keep them running for years to come.… It should not come as a surprise that NASA is turning off instruments.

Mission engineers at NASA's Jet Propulsion Laboratory in Southern California turned off the cosmic ray subsystem experiment aboard Voyager 1 on Feb. 25 and will shut off Voyager 2's low-energy charged particle instrument on March 24.