Are we searching hard enough for aliens?

It has been called the Fermi paradox, after the physicist Enrico Fermi, and it asks why - if it is so probable that life exists elsewhere in the universe - haven't we found any?
The common suggestion in response to this paradox is to explain that the universe is very, very big - and there are a lot of places we could potentially find some life. Looking everywhere takes some time.
Now, a trio of astrophysicists have taken another look at the "needle in a haystack" analogy and have created a model to assess how much work has actually been done to search for aliens.In the paper written by the scientists from the Pennsylvania State University, the trio question how much work projects such as SETI (Search for Extra-terrestrial Intelligence) have actually done.They compared this work against the hypothetical amount of searching that would need to be done before scientists can believe it is probable that there is no extra-terrestrial life.In 2010, Dr Jill Tarter famously compares the search for alien life to looking for fish in a glass of water while standing beside the unexplored ocean.
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