There is a hypothesis that the Ordovician–Silurian mass extinction 450 million y... | Hacker News

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e0m on Jan 29, 2015 | parent | context | favorite | on: Gamma-ray bursts are a threat to life

There is a hypothesis that the Ordovician–Silurian mass extinction 450 million years ago was caused by a Gamma-ray burst!

http://en.wikipedia.org/wiki/Ordovician%E2%80%93Silurian_ext...

It stripped the Earth's ozone and killed all the surface-dwelling organisms.

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