One night of telescope time rules out black hole/dark matter idea

The latest bit of emptiness was published this week, and it seemingly puts an end to one of the possible remaining explanations for dark matter: black holes that formed shortly after the Big Bang and have been structuring the Universe ever since. While black holes of this mass range can’t form during the deaths of stars, it is possible that they could have formed early in the Universe. So, the conclusion is that, if primordial black holes did form early in the Universe’s history, they weren’t formed in sufficient numbers to account for dark matter.

Source: arstechnica.com