Physics Curiosities

What is the big bang theory definition?

For a long time, men wondered how the Universe would have emerged. Gradually, it was necessary to abandon the idea that we occupy a central position in the Universe and adopt the conception that our location in the Universe is insignificant.

Big Bang theory definition

It is known as big bang to a huge outbreak , according to a scientific theory, marked the origin of the universe . This theory indicates that the universe originated 13.8 billion years ago , expanding thanks to the explosion in question.


The big bang is linked to the notion of cosmic expansion. In 1927 , Georges Lemaître warned that if the universe is continually expanding, there must have been a single point of origin in the past. That origin would be the bing bang. The increasing separation of the galaxies discovered by Edwin Hubble in 1929 also served to support this hypothesis .

The current bing bang theory, in short, combines the principles of the theory of general relativity with various observations on the position changes of galaxies, allowing the conditions of the universe in time to be extrapolated.

Following the precepts of the bing bang, scientists have discovered that the universe is currently expanding faster . This could be due to so-called dark energy .

This last concept refers to the form of energy found in outer space that tends to exert a certain repulsive pressure , in the opposite way to what the force of gravity does. This should not be confused with dark matter , which does not emit enough electromagnetic radiation so that scientists can detect it with current devices, although they can deduce its existence by observing certain factors and related phenomena, such as the effect it causes. in the light as it deflects her from her path.

Through the application of the physical laws that humans know of nature, it is possible to carry out a large number of complex calculations and investigations that allow us to know the characteristics of the universe millions of years ago, and some of the results obtained in the last decades they point out that the temperature and density of the beginnings were considerably high.


The series The Big Bang Theory presents a peculiar look at the typical problems of people who live on the margins of society because of having interests considered “unusual”, which in this case focus on science. Despite having well defined the vocations of the characters, the script is broad enough so that anyone with adaptation problems can feel identified and find a refuge in that group of friends without equal.

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.

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