Gamma ray burst 2 billion light-years away impacted Earth's atmosphere as strongly as a solar flare

Last year, on October 9, we on Earth witnessed the most luminous celestial event ever recorded, by far. It was a gamma ray burst (GRB) at least 10x as bright as any other example ever seen, and it lasted 70x longer than any other known GRB. This was

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Gamma ray burst 2 billion light-years away impacted Earth's atmosphere as strongly as a solar flare

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