NASA shut off a Voyager instrument. Only these 4 remain.
Nuclear fuel lasts a long time. But not forever. Both Voyager craft, launched in 1977, convert heat produced by the decay of radioactive plutonium-238 into electricity. Over the decades, NASA engineers have strategically shut off instruments to extend the life of Voyager 1 and 2, which are respectively well over 15 and 12 billion miles…