The radio afterglow has been detected of a powerfulspace explosion that went unseen, possibly an orphan gamma-ray burst or a rareblackhole event 1.7 billion light-years away. Some of the universe’s most extreme explosions leave behind almost no trace. The original explosion is unseen, but our observations can capture the long-lived echo it leaves behind as the shock front ploughs into its surrounding environment. In new r... [5070 chars]
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