> Black holes themselves are, obviously, impossible to image. What we observe is the "shadow" of the black hole. The expectation is that the flux from the shad

> Black holes themselves are, obviously, impossible to image. What we observe is the "shadow" of the black hole. The expectation is that the flux from the shadow should be consistent with zero. For M87* the observed flux ratio with the ring was ~10:1. See Paper 1: First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole https://arxiv.org/abs/1906.11238 https://arxiv.org/abs/1906.11238