A razor-thin radio signal hit the MeerKAT radio telescope from more than 8 billion light-years away, and it was far too bright to make sense. A thin, stubbornly bright line showed up in data from the MeerKAT radio telescope that did not fit the usual rules of distance. The feature sat in a familiar part of the radio spectrum, but it was coming from so far away that signals like it typicall... [4857 chars]
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