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  Scientists have verified an essential property of black holes The research team conducted an analysis of data from the most massive black hole merger ever recorded. Black holes, characterized by their mass and angular momentum, are remarkably simple entities compared to the more intricate matter distributions found in stars or planets. These mysterious cosmic entities emit a unique gravitational wave spectrum with distinct frequencies that gradually decay over time. When two black holes merge, the final phase of gravitational wave emission manifests as a mixture of rapidly damped sinusoids. The black hole no-hair theorem, an important property governing black holes, postulates that the quasi normal mode spectrum of a black hole should be highly constrained. This is because only two parameters, mass and spin, are expected to determine the entire spectrum. A global team of researchers from Radboud University has validated this fundamental characteristic of black holes thro...