Is Dark Matter Made of Black Holes?

Could dark matter consist of primordial black holes, as numerous as the stars? It’s an old, improbable idea, but it made a Lazarus-like comeback a year ago, when the discovery of gravitational waves suggested that the cosmos abounds with unexpectedly heavy black holes. With decades-long searches failing to find the hypothetical dark matter particles that theorists have favored, physicists, including Marc Kamionkowski, former Member (1991–95) in the School of Natural Sciences, and current Member in the School Timothy Brandt, are turning to more radical ways of explaining the universe’s missing mass.

Read more at Science Magazine.