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The probe's runaway speed essentially buys it immortality. New Horizons will drift among the stars forever. It seems pretty unlikely any aliens could find these interstellar notes-in-bottles, but who can imagine the capabilities of an advanced extraterrestrial civilization? These plucky robots are monuments to our curiosity that will vastly outlast the Egyptian pyramids. They will be the last surviving artifacts of an inquisitive bipedal race called Homo sapiens that once lived in the galaxy's Orion spur.
Originally posted by Xammu
...All matter, including the metal the probes are made from, eventually dissipates atomically. The lighter elements do so at such a slow rate that it is impossible to detect with our strongest instruments. Nevertheless, after trillions, even quadrillions of years, the probes would be reduced to almost nothing.