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Q&A If humans evolved on Mars instead of Earth, how quickly would we have detected life on Earth?

Suppose that both Earth and Mars was booming with life in a similar way. Except that, on Earth, there was no hominid family, and no humans evolved. Instead, humans evolved on Mars. Assuming we ha...

2 answers  ·  posted 5y ago by Bridgeburners‭  ·  last activity 5y ago by Bridgeburners‭

Question astronomy planets alternate-history history life