What If Dark Matter Is Just Black Holes?

The video explores the hypothesis that dark matter could be composed of black holes, specifically primordial black holes formed in the early universe. It discusses the challenges of this theory, including the need for black holes to be abundant and spread out like dark matter. Various methods, such as microlensing, are used to test this hypothesis by ruling out certain black hole masses. The video concludes that while black holes are unlikely to account for all dark matter, the search for its true nature could lead to new physics.

What new insight or understanding did you gain from this video?