The speculation that some form of alien life exists beyond our planet goes back to ancient Greece and Rome, yet humans have still not made contact.
There have been various theories, including the lonely proposal that human-level intelligence is totally 'unique' in the universe, but one scientist has revealed a more likely scenario - alien civilizations were destroyed by gamma-ray bursts (GRBs).
GRBs are immensely energetic explosions that have been observed in distant galaxies, occurring when the core of a massive star runs out of nuclear fuel and collapses under its own weight, unleashing a massive 'super nova' of radiation.
'It's a tightly focused beam,' astronomy professor Dr. Frederick Walter told DailyMail.com. 'And, if it's directed through the plane of the galaxy, it could basically sterilize about 10 percent of the planets in the galaxy.'
'It's just one of many possible explanations,' he noted, 'sort of morbid, I suppose.'
The premise is entirely wrong. Aliens have cotacted us.
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