According to the Fermi paradox, there are multiple filters and a great filter that civilizations have to pass to keep evolving. What are these barriers?
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1. Probability, as stated by many others.
You have to flip a lot of heads in a row to make life and make it thrive.
2. Distance.
The *observable* universe is 45 billion light years. This means that anything we can observe from even the closest stars is delayed by a number of years equal to the distance (the closest ones are 5 to 15 light years away). And travel would take several hundreds of years at best from even the closest stars, let alone anything at the edge of our galaxy (100’000 light years away) or away from it.
3. Humans.
What makes you think that an alien wouldn’t be so different from us that we were not able to understand it as intelligent life? We are used to E.T. and stuff like that, but maybe it could be something impossibly different.
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