The Changing Shadow of M87* In 2019, the EHT collaboration released the first-ever image of a black hole, a “fiery doughnut” ...

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 ...