An artist’s concept depicts one of NASA’s Voyager probes. The twin spacecraft launched in 1977. Credit: NASA/JPL-Caltech The farthest-flung human-made objects will be able to take their science-gathering even farther, thanks to these energy-conserving measures. 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. Thre...