The universe is so huge it is unlikely we're alone.
Fire is a natural phenomenon on Earth, but evidence suggests humans first discovered how to control it. In time, this enabled early civilisations to smelt and mould metals, leading first to the Bronze Age, then the Iron age. Over millennia, this resulted in the invention of the internal combustion engine, a revolution in our history.
Some also argue that cooking food led to an expansion in our brains, further enabling humans’ incredible development. However, laboratory experiments have shown that atmospheres with oxygen levels below about 18% do not allow combustion to fully occur. This suggests that even if life did proliferate on such a planet, they would never be able to develop technology advanced enough to either find us, or help us find them.
‘You may have enough oxygen in the atmosphere of an exoplanet to have complex multicellular life, but you may not have enough oxygen to start combustion,’ said co-author Professor Amedeo Blabi, speaking to New Scientist.The University of Rome scientist, alongside co-author Professor Adam Frank from New York’s University of Rochester, suggests this ‘bottleneck’ for creating advanced civilisations may explain why we have yet to find life beyond Earth – potentially solving the Fermi paradox.
The Fermi paradox is the discrepancy between the lack of evidence for advanced extraterrestrial life and the likelihood of its existence, given the sheer scale of the universe.
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