An artist's concept of teeny primordial black holes (though in reality they wouldn't have accretion disks). Illustration: NASA's Goddard Space Flight Center Black holes are some of the most vexing ...
As such, one alternative that scientists are exploring to explain dark matter are so-called primordial black holes, ones that ...
But there is a fourth type that remains hypothetical and unobserved. Known as primordial black holes, they are thought to have formed from tiny fluctuations in the hot and dense early cosmos.