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Astronomers missed a space explosion as powerful as a billion suns — until they spotted its echo

A cosmic explosion with an energy equivalent to the output of a billion suns went unnoticed by astronomers until they caught ...
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A cosmic explosion with the force of a billion suns went unseen—until we caught its echo

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 ...