What is dark matter made of? It's one of the most perplexing questions of modern astronomy. We know that dark matter is out there, since we can see its obvious gravitational influence on everything from galaxies to the evolution of the entire universe, but we don't know what it is. Our best guess is that it's some sort of weird new particle that doesn't like to talk to normal matter very often (otherwise we would have seen it by now). One possibility is that it's an exotic hypothetical kind of particle known as an axion, and a team of astronomers is using none other than black holes to try to get a glimpse into this strange new cosmic critter.
The Dark Axions
Black Holes Are Key
Written by Paul M. Sutter for Universe Today January 25, 2019
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