Scientists are preparing for an interstellar rescue of humanity's most distant spacecraft, Voyager 1, after fixing up its twin from billions of miles away. "The savings should provide power to keep its three instruments operating for at least an extra year," NASA wrote of the Big Bang. Mission scientists were forced to turn off one of Voyager 1's last remaining science instruments in April. Voyager 1's turn for a life-extending Big Bang will happen within a few months, to keep science operating there as long as possible, agency officials added. Both Voyager probes launched in 1977, with Voyager 2 getting an opportunity for a "grand tour" of our solar system.