Watch: How NASA keeps its 46-year-old Voyager spacecraft going Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. CNN — Engineers have sent a “poke” to the Voyager 1 probe and received a potentially encouraging response as they hope to fix a communication issue with the aging spacecraft that has persisted for five months. Launched in 1977, Voyager 1 and its twin, Voyager 2, are venturing through unchart...