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of supernovas and extinction events

the journal of Michael Werneburg

twenty-seven years and one million words

So, it looks like a supernova could have stripped the Earth of its ozone layer 360 million years ago, at the end of the Devonian. This was just when some creatures were beginning to live on the Earth's land surfaces, and it took 40 million years to recover. 200 million years after that there was the Chicxulub impact event. Space is a pretty rough neighborhood.