Could Early Universe Black Holes Be Dark Matter?

Artist’s impression of a microlensing event caused by a black hole observed from Earth toward the Large Magellanic Cloud. The light of a background star located in the LMC is bent by a putative primordial black hole (lens) in the Galactic halo and magnified when observed from the Earth. Microlensing causes very characteristic variation of brightness of the background star, enabling the determination of the lens’s mass and distance.
Credit: J. Skowron / OGLE

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