Physics Curiosities

Big Bang Theory Science Definition

Theory of the Big Bang is one of the most popular and widespread theories that exist about the origin of the universe and that considers that it was the product of a tremendous explosion .

The name of Big Bang is due to the British-born astronomer Fred Hoyle and was the product of his intention to name this theory in a pejorative way, with which he did not agree at all. By the way . this astronomer was the author of the steady state theory.

It can serve you: Who proposed the big bang theory?

According to what the Big Bang proposes, one was in nothingness itself and suddenly, after a great explosion, matter emerges and as a consequence the whole universe. The shock wave from that explosion was able to radiate in all directions and created what we now call the universe.
Meanwhile, that matter that began to disperse in a fantastic way after the Big Bang was composed of fundamental particles such as electrons, photons, baryons, positrons, among others.

The first elements that constitute the universe would have been produced immediately after the Big Bang and at times when the temperature was really high and the density present generated the fusion of particles into chemical elements.

Elements such as hydrogen and helium were the first to appear after the explosion and the heavier components arrived after these, apparently in the stars themselves. A theory about the appearance of galaxies and stars maintains that when helium and hydrogen cooled, they condensed in these stars.

See also: What is the big bang theory definition?

It is worth noting that since the explosion occurred, the universe did not stop expanding and as a result of this the astro- physical objects began to move further and further away, appearing at the distances that we appreciate today.

Recently, scientists from the specialized center of the University of Harvard who just study this issue found evidence of gravitational waves that contribute to the theory of the Big Bang.

The Big Bang theory considers that galaxies are moving away from each other, as observed by Edwin Hubble, in 1930. Thus, it is admitted that, in the distant past, around 10 to 15 billion years ago, all galaxies were at the same point, at a very high temperature, which expanded in the Big Bang.

So, although the name ” Big Bang ” reminds us of the idea of ​​a kind of explosion, in fact, what happened was an expansion, from a tiny (and very dense) state to what it is today. In other words, the Big Bang Theory is not intended to explain what started the creation of the Universe, what existed before the Big Bang or even what exists outside the Universe, but how it “became” what today we call it the Universe.

Belgian priest, civil engineer and cosmologist Georges-Henri Lemaître was most likely the first to propose a model for the Big Bang in 1927. He imagined that all matter was concentrated in one point, which he called the primordial atom , and that this atom had broken into many pieces, which were fragmenting more and more, until they reached the atoms that we know today. The hypothesis raised by Lemaître is the first idea that nuclear fission would have occurred (a process in which a heavy atom fragments into lighter and more stable nuclei).

Although incorrect, since the hypothesis developed by Lemaître violates the laws of the structure of matter, it inspired modern models of theories about the origin of the Universe.

Regardless of Lemaître, the Russian mathematician and meteorologist Alexander Friedmann discovered a whole family of solutions to the General Theory of Relativity equations (this is the theory of gravity, describing gravitation as the action of the masses in the properties of space and time, which ends up not only affecting the movement of bodies, but also other physical properties).

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