The Zoo Hypothesis: Are aliens avoiding Earth?

‘In 1950, physicist Enrico Fermi asked a very important question over lunch at the Los Alamos National Laboratory. Based on the number of galaxies we know exist, how many stars are inside those galaxies, and how many planets potentially orbit those stars, probability states that there should be alien life. So, where is everybody?
This question – known as the Fermi Paradox – raised a lot of eyebrows, because it’s a logical thought when considering just how vast our Universe is. While there are many different hypotheses out there that attempt to concoct an answer, one of the best and most thought-provoking is the zoo hypothesis.
The zoo hypothesis was thought up in 1973 by MIT radio astronomer John Ball. He posited that, yes, there might well be intelligent aliens out there, but maybe they are simply ignoring us, forcing us to live in a cosmic ‘zoo’ or wildlife sanctuary where they can monitor our activity without disturbing it.’
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