What if humanity is just the first draft at intelligent life? A new theory from astrophysicists Tsvi Piran and Raul Jimenez suggests that, due to a since-decreasing frequency of Galactic Gamma-Ray Bursts in the early universe, human beings may be the first intelligent life forms to have the time necessary to evolve in the Milky Way. Were it not for the Milky Way’s high metallicity, Dr Piran and Dr Jimenez reckon, GRBs would be common enough that a planet almost anywhere in the galaxy would have suffered from at least one in the past billion years. They estimate that even now only 10% of the universe’s galaxies would host sufficiently few GRBs to give the evolution of complex life a fair run.
Posted on: Wed, 22 Oct 2014 14:35:51 +0000
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