Dark Matter May Have Left Its Fingerprint in a Gravitational Wave.

Physicists at MIT and across Europe have developed a new method that may allow for the detection of dark matter, which constitutes roughly 85 percent of all matter in the universe but has never been directly detected. When two black holes collide and merge, they create gravitational waves that can carry an imprint of dark matter if the black holes pass through a dense cloud of it. This technique enables scientists to read that imprint, and one signal in existing data is already attracting attention.