20-Day Signal From Dead Star: Astronomers detect ‘heartbeat’ from AT2020afhd; may reveal black hole spin

A dead star’s remnants are pulsing every 20 days, offering strong evidence for Einstein’s theory of frame-dragging. This phenomenon, observed in the debris of a star shredded by a black hole, shows the twisting of spacetime caused by a rotating massive object. The discovery provides a new way to study black hole spin and its impact on cosmic events.

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