Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas cover image

259 | Adam Frank on What Aliens Might Be Like

Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas

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Civilization Erased by Time

The speaker suggests a civilization as large as the current one could have existed a hundred million years ago, but it would have been erased over time. The earth's surface undergoes significant restructuring over millions of years, with most traces disappearing after 10 million years due to subduction and other geological processes. Fossils are also unreliable due to the incompleteness of the fossil record.

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