Launched in 1977, the Voyager probes are NASA's longest-running and most distant spacecraft. They are currently exploring interstellar space, but their power is dwindling. To extend their operational lifespan, NASA is turning off some of their instruments. - NASA is powering down two scientific instruments on both Voyager 1 and Voyager 2. - This action is necessary to conserve the spacecraft's limited power supply. - The Voyager probes have been exploring interstellar space for over 47 years. - Voyager 1 is currently 24.14 billion kilometers away from Earth. - More instruments may need to be shut down in the future to keep the probes operational.