Futurism:  NASA's two Voyager spacecraft have spent almost half a century traveling through distant space. The probes, which launched less than a month apart in the summer of 1977, have survived a lot, from dwindling power supplies and grimy thrusters to near-fatal software glitches. Voyager 1, in particular, which is currently floating past the generally-defined edge of the solar system some 15 billion mil...

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