Observation confirms that a black hole’s area can only grow and never shrink



Summary

Recent observations of a black hole have provided strong evidence supporting the theoretical “black hole area theorem,” which states that the surface area of a black hole’s event horizon can only increase or remain constant over time, never decrease. This aligns with Einstein’s theory of general relativity and is often seen as a black hole analogue to the second law of thermodynamics. The findings, derived from gravitational wave data produced by a black hole merger, demonstrate that the final black hole’s area was indeed larger than the sum of the areas of the two original black holes, reinforcing the theorem’s validity. This confirmation further solidifies our understanding of black hole physics and the fundamental laws governing the universe.

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