Welcome to an astronomical hell: the birth of black holes. Like neutron stars, these objects are among the most compact in the universe and result from the collapse of massive stars at the end of their life. In both cases, the birth is cataclysmic: the outer layers of a giant star explode in a violent rebound. This gives rise to one of the shortest and most intense phenomena known in the universe: a burst of gamma. It lasts no more than a few minutes and can release in one second all the energy emitted by the Sun throughout his life. This is the "birth cry" of black holes.
It is so prodigiously powerful that we can detect it everywhere in the Universe, even billions of light years away. The specialists estimate that it lights one per day on the celestial vault. They are so "bright" that we would see them very well if our eyes were gamma-ray sensitive. Astronomers have some
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