the answer to the Fermi paradox is that the aliens have always been here, and that they made us. it's in Genesis, the Enuma Elish, and countless other origin myths from cultures around the world
picrel from Apollo 20 a joint US/USSR mission to explore a crashed mothership on the moon
http://www.angelismarriti.it/ANGELISMARRITI-ENG/REPORTS_ARTICLES/Apollo20-NewEvidence.htm