Swarms of 'primordial' black holes might fill our universe
By Rafi Letzter - Staff Writer 3 days ago
Beware the primordial black hole.
(Image: © Shutterstock)
The universe might be full of tiny, ancient black holes. And researchers might be able to prove it.
These mini black holes from the beginning of time, or primordial black holes (PBHs), were first dreamed up decades ago. Researchers proposed them as an explanation for dark matter, an unseen substance that exerts a gravitational pull throughout space. Most explanations for dark matter involve hypothetical particles with special properties that help them evade detection. But some researchers think swarms of little black holes moving like clouds through space offer a cleaner explanation. Now, a new study explains where these PBHs might have come from, and how astronomers could detect the aftershocks of their birth.
Where did the little black holes come from?
A black hole is a singularity, an infinitely dense point in space packed with matter. It forms when that matter gets so tightly packed that the force of gravity overwhelms everything else, and the matter collapses. It warps space-time and surrounds itself with an "event horizon," a spherical boundary region beyond which no light can escape.
The laws of general relativity allow black holes to exist at any scale; crush an ant hard enough and it will collapse into a black hole just like a star; it'll just be incredibly tiny.
More:
https://www.livescience.com/primordial-black-holes-hunt.html?utm_source=notification
= new reply since forum marked as read
There’s supposed to be much more ‘dark matter’ than regular matter. To cause the lensing, distortion and gravitic effects that’s been attributed to dark matter would mean there would be gazillions of little black holes all through the galaxy. Yoicks, hope none of them decide to visit our solar system like that ‘Ouamuamua object that flew through a couple of years ago! 
