But there are key distinctions. "Because Sagittarius A* is a much smaller black hole - it's around a thousand times smaller - its ring structure changes on timescales that are a thousand times ...

M87: The significance of the first ever image of a black hole The image shows an intensely bright "ring of fire", as Prof Falcke describes it, surrounding a perfectly circular dark hole.

The researchers found that the emitted dark matter would ring space-time like a bell around the black hole. It would not be as strong of a signal as the ones that come from black hole mergers ...