primordial black hole. tagged posts

Dark Matter is Not Made Up of Tiny Black Holes

The Milky Way galaxy (left) and the Andromeda galaxy (right) are separated by 2.6 million light years. Compared with the areas where stars are clustered together, dark matter is believed to be distributed over a much larger volume.
Credit: Kavli IPMU

An international team of researchers has put a theory speculated by the late Stephen Hawking to its most rigorous test to date, and their results have ruled out the possibility that primordial black holes smaller than a tenth of a millimeter make up most of dark matter. Details of their study have been published in this week’s Nature Astronomy.

Scientists know that 85% of the matter in the Universe is made up of dark matter. Its gravitational force prevents stars in our Milky Way from flying apart...

Read More