Voyager 1 and Voyager 2 launched back in 1977 with only a five-year mission to take a gander at Jupiter and Saturn’s rings and moons. Obviously, the Voyager spacecrafts have persisted a lot longer than five years: 46 years, to be exact. They’re still careening through space at a distance between 12 and 14 billion miles from Earth. So how have they lasted four decades longer than expected?

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