Two of the most enigmatic phenomena in the cosmos may be linked

Black holesRAL—objects so dense that nothing can escape their pull—are among the most eye-catching predictions of general relativity, a model of gravitational attraction proposed by Albert Einstein over a century ago. They squat invisibly in the middle of galaxies, feasting on stars and interstellar debris.They are also a clear indicator that general relativity’s days as gravity’s best explanation are numbered. That theory says a black hole’s core is a point of infinite density and pressure called a singularity. This, says Chris Pearson at Space, Britain’s national laboratory for space research, is a mathematical impossibility.