Not sure if any of you are aware of what gamma radiation bursts are but there is some speculation that at least one or more of the massive die offs of Earth creatures in Earth's past may have been connected to such a thing.
I'll post some articles later.
To summarize, a GRB occurs (we think) when a nova or supernova occurs, a star collapses, two massive bodies collide (likely black holes) or possibly local to our own area of space, the sun spits out a massive coronal mass ejection which hits the planet.
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