So, black holes, or dark stars, as the first physicist who postulated their existence, John Mitchell, a priest, called them in 1783. He had an intuition way, way ahead of his times. By focusing on the idea and by maybe some suggestion from some astral beings, he drew from one of God's spheres of thought an idea existing in the causal realms that nobody else grasped before, in this civilization.
A black hole is called black since it is not directly visible because it emits no light. Nothing, not even the photons, the light particles, can escape its immense gravitational field. It can be seen indirectly, by its halo, he glow emitted by the plasma-state particles rotating around it, with the light distorted by the huge gravitational field. So far, we have radio images of two black holes, both located in the center of a galaxy. One of them is Sagittarius A*, the center of our galaxy. In the following picture what we see is the glow of the trapped particles, glow which is amplified in some parts by the light distortion.
