What you are seeing is material orbiting Sgr A* less than 60 million kilometers from the black hole! The black hole’s shadow isn’t the black hole itself, it’s what we metaphorically refer to as the black hole’s shadow: Close in, yet still above the Point of No Return, photons of light can orbit the black hole before falling in and so we see no light from that area.

The fantastic accomplishment of observing the same region at the same time was made possible by connecting eight telescopes across our world and giving them the same eyesight as a single telescope the size of Earth. They examine in extremely long wavelengths of light, comparable to that used by your microwave to cook food, and meticulous measurements assisted astronomers in combining their findings and peering into the dark center of our galaxy.