Are There Lost Alien Civilizations in Our Past?
Kurzgesagt – In a Nutshell · 1 则 HN 推荐
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Kurzgesagt asks whether advanced civilizations could have existed on Earth in the deep past and left little evidence. It looks at time as a dimension for searching for alien civilizations and the limits of the geological record.
HN 推荐的原因： HN brings it up in threads on ancient civilizations and detecting past technology in geology.
“I enjoyed Kurzgesagt's video [0] about our ability to sense ancient aliens.” 阅读 HN 讨论 ↗