Hunting dark matter 'stars' that mimic black holes

Hypothetical dark matter stars known as "boson stars" could leave telltale ripples across the cosmos, offering researchers a new way to probe the invisible forces shaping the universe. In 2019, a strange event was observed in the depths of space. Called GW190521, the event sent out gravitational waves-invisible ripples in the universe-that were picked up on Earth. These waves appeared to mark the moment when two massive black holes, dozens of times the mass of our sun, collided and merge...