|According to theorm 7.3.2, there
are 1-12 old technological civilizations
in our galaxy that operate interstellar space travel.
Really old civilizations, those that have existed for several million years, will have seen some species evolve, evolve and die out again over the course of their history.
Our civilization, with its little more than 300,000 years, is quite young in comparison with the "galactic" periods shown. We only reached technological level 6200 years ago and are in the process of developing planetary level 7. On the galactic level (level 8) we are at best newcomers.
Old alien civilizations may have visited and contacted humanity since the beginning of its development. It seems that they also left a number of traces (e.g. cave paintings) on humans.
This makes the following hypothesis possible:
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