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The Voyager spacecraft will probably last a billion years, says a scientist on the mission for nearly five decades
(www.businessinsider.com)
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Pretty bold statement there. However, it's just the civilization that needs to perish, not mankind, for our knowledge to be lost within a few decades.
Considering the number of civilisations that have perished (like, there were quite a lot) vs the number of civilizations that have persisted (uh... One? Which is young and just hasn't dissolved yet) I'd say the chances for that to happen is definitely not zero. It's not necessarily one either, of course.