As other answerers mentioned, you are probably thinking of the Drake Equation. It isn't a theory. It's simply an organized way of asking the question of how many intelligent technological species may exist out there. It does not in any way purport to provide a specific answer to that question.
As other answerers mentioned, you are probably thinking of the Drake Equation. It isn't a theory. It's simply an organized way of asking the question of how many intelligent technological species may exist out there. It does not in any way purport to provide a specific answer to that question.
I think you're talking about the Drake Equation, but it's NOT a theory - it's just a back-of-the-envelope calculation, and has a lot of problems with assumptions and numbers we don't actually know.
