A massive burst of gamma rays produced by ... GRB 221009A appears to have come from two billion light-years away, yet it still had a marked effect on the ionosphere. “This disturbance impacted ...

As the light traveled to us, interaction with the intergalactic medium caused the burst to flicker in brightness ... it proves that it is specifically an effect of their intense magnetic fields.

A fast radio burst, or a strong pulse of energy, was tracked to a distant long-dead galaxy that astronomers never thought could produce such a signal.