‘Alien cliques’ may be keeping Earth isolated – study

‘If the idea really is true that aliens are deliberately preventing humans from contacting them, then extraterrestrial civilizations most likely formed a number of cliques rather than a pan-galactic government, a new study suggests.
The Fermi paradox – named after physicist Enrico Fermi – says that if sentient life is not unique to Earth, then our galaxy should have plenty of other civilizations, including some more technologically advanced than ours. The paradoxical part is that we have not detected any signs of them.
A supposition called ‘the zoo hypothesis’ is one possible solution for this conundrum, and states that alien civilizations are for some reason deliberately keeping humans from detecting any extraterrestrial life.’
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