HOUSTON—NASA’s Voyager 2 probe should join its twin, Voyager 1, by departing the Solar System in 2–3 years, according to one of the project’s longest-serving science team members. Voyager 2 launched first from Cape Canaveral, Florida, on Aug. 20, 1977, followed by Voyager 1 on Sept. 5, 1977. Both probes took advantage of a planetary alignment that only occurs every 176 years, using gravitational assists to reduce fuel and time to thread their ways through the outer ...

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