The Voyager spacecraft have been cruising through interstellar space for more than 47 years, collecting precious data on the vast cosmos. All that traveling has taken a toll on the farthest human-made objects, and the spacecraft’s days are numbered. NASA engineers are resorting to shutting off science instruments on both Voyager probes to keep the two iconic missions alive. Mission engineers at NASA’s Jet Propulsion Laboratory turned off Voyager 1’s cosmic ray subsystem experiment on February 25...