Astronomers analyzing M87*, the first black hole ever imaged ... They found that the bright ring’s location fluctuates due to turbulence in the hot gas surrounding the dark vortex.

On left, this composite simulated image shows how M87* is seen by the Event Horizon Telescope at 86 GHz (red), 230 GHz (green), and 345 GHz (blue). On right, 345 GHz is seen in dark blue ...