Astronomers Struggle to Explain Why Ancient Black Holes Are Nowhere to Be Found
Briefly

Many researchers feel they are a strong candidate for dark matter, but there would need to be plenty of them to satisfy that theory... we have a model which should explain why this is the case.
Primordial black holes, potentially as small as an atom, could neatly explain the existence of dark matter, accounting for over 85 percent of all mass in the universe, but are challenging to detect.
Primordial black holes are created through the collapsing of gravitational waves.
Read at Futurism
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