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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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Astronomers spot a magnetar’s birth using a general relativity effect

Astronomers have identified the birth of a magnetar, a hyper-magnetized neutron star, by detecting a subtle warping of space-time predicted by Einstein’s general relativity. The discovery came from ...