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 miles away, is looking worse for wear these days.
Most recently, scientists became worried after the lonely probe started sending nonsensical messages back to Earth — as if its senility was catching up with it.