Smile – this writer has humour !
I was listening to the radio while still in bed last weekend and they were talking about how, in the year 775, gamma rays blasted the earth with a heavy dose of radiation.
How did they figure this out, the interviewer asked? It wasn’t from eye-witness accounts, because people wouldn’t have even noticed it.
It also wasn’t from catastrophic damage caused by the radiation, because it didn’t plunge the world into a nuclear winter, nor did it blow away the ozone layer or cause people to grow extra limbs, so there was little evidence of it even happening.
Turns out the scientists found clues by looking at tree rings. And then, in order to find an answer to this, they determined it was caused by two black holes that had collided with each other.
Despite these explanations, I still don’t understand how they figured out that this happened…
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