In those years Stephen Hawking enters the scene. After graduating in physics he is completing a doctorate in Cambridge under the supervision of cosmologist Dennis Sciama.
Hawking is literally bewitched by the scientific ferment around General Relativity and black holes.
Despite the first manifestations of amyotrophic lateral sclerosis, begins to deepen the Big Bang theory, at that time not accepted by all academics. Hawking compares the Big Bang to a reverse black hole: instead of finishing everything in a singularity, everything starts with a singularity.
And together with Penrose, in 1970, he published a work which demonstrates how the Universe was born of a singularity. [3]
Hawking senses that a black hole can only increase in size, never shrink, it understands that the mass of a black hole determines the size of the space that surrounds the singularity within which nothing can come out. The border takes the name of "event horizon". He senses that a black hole can not "break", not even in the case of a collision with another black hole and comes to juxtapose the continuous expansion of the event horizon with another concept: entropy, which measures the degree of disorder of a system. Entropy (the disordered state of a system) it can only increase, never decrease: the universe therefore becomes more and more disordered the more it ages.
MAQ/March 2018/42