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by marcosdumay 1467 days ago
Well, that's not a good assumption to make. Our most capable life detector¹ is analyzing the atmosphere of planets, captures stuff similar to our simplest single celled life. So, it's not a good guess that it's common.

1 - Actually our second best. The best one is the fact that nobody colonized Earth before we existed, that is tuned in space-faring life.