Where are the aliens?

– Explanations for the Fermi Paradox

In my former article „On the Drake equation“ I have shown a way how to reduce the number of 4 completely unknown Variables in the Drake equation to only one by application of a model of an interstellar ecology. The Drake equation was introduced in 1961 and provides a simple model for the estimation of the number of intelligent communicative civilizations in our home galaxy. It is related to the Fermi paradox. The Fermi paradox is the contradiction between the lack of evidence for the existence of extraterrestrial civilizations and the estimates that lead regularly to very high probabilities for existence. Famous physicist Enrico Fermi (1901-1954) once produced the following arguments:

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On the Drake equation

– Ecology leads to a simplified equation and a solution of the problem

In 1995 mankind discovered the first extrasolar planet and since then we have detected thousands of them. We have also detected planet candidates that seem to be within a certain distance to their home stars so that liquid water should exist on their surface. We have detected enough of those worlds to get into statistic ranges, where extrapolations normally are quite good (significant). Meanwhile we can predict with a high certainty that our galaxy owns at least millions of planets with conditions that allow life as we know it. But where are the aliens?

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Actually, if there are so many worlds with conditions that are similar to planet Earth, there should be an agile traffic between all that planets. Aliens should regularly visit us, one might expect. Why don’t they? Where are they? Do they actually exist? At least these alien civilizations should be capable to send radio signals into the surrounding universe, as we do. We are searching for that alien radio signals since decades now but never found anything. Why is space void if there are so many planets with possible life conditions? We call this discrepancy the Fermi Paradox.

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