WHAT IS THE FERMI PARADOX?
The Fermi Paradox questions why, given the estimated 200-400 billion stars and at least 100 billion planets in our galaxy, there have been no signs of alien life.
The contradiction is named after its creator, Italian physicist Enrico Fermi.
He first posed the question back in 1950.
Fermi believed it was too extraordinary that a single extra-terrestrial signal or engineering project has yet to be detected in the universe — despite its immense vastness.
Fermi concluded there must a barrier that limits the rise of intelligent, self-aware, technologically advanced space-colonising civilisations.
This barrier is sometimes referred to as the 'Great Filter'.
Italian physicist Enrico Fermi devised the so-called Fermi Paradox in the 1950s, which explores why there is no sign of alien life, despite the 100 billion planets in our galaxy
If the main obstacle preventing the colonisation of other planets is not in our past, then the barrier that will stop humanity's prospects of reaching other worlds must lie in our future, scientists have theorised.
Professor Brian Cox believes the advances in science and engineering required by a civilisation to start conquering the stars will ultimately lead to its destruction.
He said: 'One solution to the Fermi Paradox is that it is not possible to run a world that has the power to destroy itself.
‘It may be that the growth of science and engineering inevitably outstrips the development of political expertise, leading to disaster.'
Other possible explanations for the Fermi Paradox include that intelligent alien species are out there, but lack the necessary technology to communicate with Earth.
Some believe that the distances between intelligent civilisations are too great to allow any kind of two-way communication.
If two worlds are separated by several thousand light years, it's possible that one or both civilisations would become extinct before a dialogue can be established.
The so-called Zoo hypothesis claims intelligent alien life is out there, but deliberately avoids any contact with life on Earth to allow its natural evolution.
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