A. J. Iovino

Astrophysicists have shown: the merger of two non-spinning black holes always produces an object with maximally chaotic movement of light rays at the horizon. The discovery helps better decode gravitational waves and test general relativity.

An analysis of black hole mergers over the past year of observations reveals: almost all signals come from ordinary black holes of stellar origin. Primordial black holes, if they exist at all, make up only a tiny fraction of dark matter.