Dark matter might make space-time ring like a bell around black holes — and we might be able to 'hear' it

A black sphere is surrounded in gasses that fade from a bright purple to a dark rust. .

It turns out that dark matter can sing, but only if it's given a microphone made of a black hole.

The true nature of dark matter has eluded scientists for decades. To explain why dark matter particles haven't come up in any direct detection experiments, physicists have wondered if it may be a kind of particle known as an axion. Axions are predicted in highly theoretical models of the strong nuclear force and also appear in various versions of string theory.