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When the most massive stars (20 times than our sun) consumes all their hydrogen and then all their helium, they can't fed anymore the nuclear reactions that allow them to emit an intense blue light and contrast the enormous gravitational force of their own mass.
So, they start to collapse to the infinite, concentrating all their mass in a volume even smaller of the Earth.

This is the birth of a BLACK HOLE and shows how immense can be the gravitational force in the universe.
At a certain distance from a black hole, called the EVENTS HORIZON, nothing can excape any more, neither light and, conversely, everything falls into it at an increasing enormous speed, emitting GAMMA and X-radiation.
So, black holes can't be seen by us and only their X and Gamma emissions reveal their presence.
Black holes are always in the center of galaxies, surrounded by wide and dense clouds of gases. These central black holes are supermassive, even billions of times more than our Sun.
The great energy they emit excite the surrounding clouds producing high energy electrons that emit an enormous X-ray radiation.
These are called QUASARS (QUASi stellAR objects) and are the most powerful energy sources of the universe.
They also attract many stars accelerating them towards their destruction; their speed is proportional to the black hole mass that can be calculated in this way.
Normally, much less massive black holes are frequent in the galaxies, everywhere a single big star had died .
Sometimes, black holes orbitate around a younger star of what once was a double or triple stars system, attracting its matter with great gaseous protuberances directed, appearently, to the NOTHING.

Learn more about this author, Aldo Bonincontro.
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