Could primordial black holes be dark matter?

(PhysOrg.com) — “We know that about 25% of the matter in the universe is dark matter, but we don’t know what it is,” Michael Kesden tells PhysOrg.com. “There are a number of different theories about what dark matter could be, but we think one alternative might be very small primordial black holes.”

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Could primordial black holes be dark matter?