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Q&A Could intelligent life on Earth have been seeded by precursor aliens?

This idea comes up quite frequently in science fiction, but there has not been a question about it yet on Worldbuilding.SE. Is it possible that intelligent life was brought to Earth by an alien ci...

5 answers  ·  posted 10y ago by bazola‭  ·  last activity 7y ago by bazola‭

Question aliens intelligence earth origin-of-life life