​Time dilation at the event horizon and the acoustics of the Perseus Cluster.

​We see them as points of no return, but the reality of a black hole is far more complex than just "destruction." From the extreme time dilation at the event horizon—where you could theoretically witness the "end of time" in the outside universe—to the haunting eons-old echo found in the Perseus Cluster sonification, these objects challenge everything we know about physics.

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