NASA has revived a set of thrusters on the nearly 50-year-old Voyager 1 spacecraft after declaring them inoperable over two decades ago. It's a nice long-distance engineering win for the team at NASA's Jet Propulsion Laboratory, responsible for keeping the venerable Voyager spacecraft flying - and a critical one at that, as clogging fuel lines threatened to derail the backup thrusters currently in use. The things you have to deal with when your spacecraft is operating more than four decades beyo...