What the common term " BLACK HOLE " is referring to is a " HOLE " at the center of a Galaxy which has a gravitation intensity so strong that nothing can escape. That is wrong. At the center of Galaxies the " CORE STAR (S) " do not emit enough light be seen against the brightness of it's surroundings. I prefer to call them " GALACTIC CORE STARS ". They are not black at any time of their existence. There may also be circumstances where the galactic core is a formation with no firm boundaries, just a jumble of gravity, energy, and matter be pulled in all directions by the gravitational forces surrounding it.
Some people have related the look and formation of Galaxies to " TORNADO'S, HURRICANES, CYCLONES " with a " CALM EYE " at their center. They conclude that the " CALM EYE " they think lies at the core of Galaxies to be a " BLACK HOLE ". However, Galaxies are based on gravitation, and there is " NO " calm eye at their core. There are of course a " CORE STAR (S) ".
After some stars have used up all or most of it's available fuel whether it is at the core of a galaxy or by itself " MOST " of the electromagnetic spectrum would be absorbed, and not be reflected or radiated from most of the surface. However, every type of energy and matter has been detected being ejected from the poles.
The " HOTTER " something gets, the greater is the intensity of energy. Like a carbon filament in a light bulb - ( i.e. it glows. ) - taking into account the entire electromagnetic spectrum.
The gravitational intensity at the core of galaxy's would " NOT " be strong enough to retain all of the energy types being generated - keep in mind gravity is the weakest of the forces. The energies surrounding a " CORE STAR (S) " at the center of galaxies would have an energy buildup extending millions of miles. That is far beyond gravity's ability to retain it - ( i.e. The energy escapes. ). Back to the color of a Galaxy Core Star (S) - the color would be bright depending on it's composition, but not black.
John Mitchell was the first person to come up with black holes - in 1783.
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