How Did The Universe Started

How Did The Universe Started

The Big Bang Theory is one of the most influential and widely accepted theories in the world, but it is also one of the most difficult theories to comprehend. Don't worry, in this article, we will clarify according to the big bang theory how did the universe began.


Despite our best efforts to explain this, there is a wealth of data that embodies the theory known as the Standard Cosmological Model of Big Bang Cosmology. An important statement of this theory is that the large-scale average of the universe expanded homogeneously from a dense early state. 


Big Bang Theory


The Big Bang Theory was born in 1929 when Edwin Hubble discovered that the universe was moving outwards. He explained this discovery by theorizing that the entire universe is expanding in this direction. The reason this theory is so popular and widely accepted is that every observation we have made about the cosmos supports it. 


Despite these discoveries, there is still controversy about the theory, but it seems to be a reasonable theory about how the universe came into being, and it is an important theory to understand in the field of astronomy. Due to the limitations of the laws of science, there is no way to determine the exact time of the origin of the universe. But scientists can look at what happened in the first moments after the Big Bang. 


The Big Bang theory does not describe the conditions at the very beginning of the universe, but it does help physicists to describe the early moments before the beginning of the expansion. In those early moments, the universe was very hot and dense. As the universe cooled down, the conditions became just right to create the building blocks of matter, such as the quarks and electrons we make. 


In short, the Big Bang hypothesis is that all current and past matter in the universe originated at the same time, 13.8 billion years ago. At that time, matter condensed into a small sphere of almost infinite density and intense heat, known as a singularity. This ball began to expand, and the universe as we know it began. 


This is known as the Big Bang Theory. Today, there is a consensus among scientists, astronomers, and cosmologists that the universe as we know it was created by a huge explosion that produced not only most of the matter but also the physical laws that govern our expanding cosmos. 

For centuries, the term has been used by scholars and non-scholars alike. This should not come as a surprise, as it is the most widespread theory of our origins. In the simplest case, the theory is simple. 



The Big Bang model seems to explain how the universe came into being as it is today, but does not provide a complete picture of the early universe. For example, the density of the universe at T = 4.3 seconds after the Big Bang was about 1090 kg / cm3 and the temperature at almost 1032 Kelvin. At that time, we would have needed quantum gravity and developed theories associated with general relativity and quantum mechanics to predict the properties of space-time. 


Cosmic inflation


The Big Bang theory is the most promising theory to explain how our universe came into being and how inflation was included, and it is part of the current concordance model of cosmology. However, there are reasons why this theory is not universally accepted. 



In science, we often go down an arduous path, accepting what is tested by experiments and observations. Albert Einstein gave us the test for the generally accepted theory of relativity, which establishes the relations between mass, energy, space, and time. He showed that a homogeneous distribution of matter in space withstands the test. 


How do we know the universe is expanding.


Astrophysicists have discovered a lot of convincing evidence for the Big Bang theory over the last hundred years. There is also evidence from observations that the universe is expanding. Looking at the light emitted by distant galaxies, scientists have found that these objects are moving ever closer to our galaxy, the Milky Way. The explosion of the Big Bang could have caused everything that could explain these observations to fly apart at some point. 


The huge explosion of the Big Bang has begun to expand the universe. All matter and energy in the universe and in space itself came from the explosion. There is no way for scientists to know exactly how, but there is evidence. 


What Cause universe to Expand


When the universe was young, it was permeated by dark energy and there was less space, so gravity prevailed, and gravity slowed expansion. Throughout billions of years, as expansion increased, the abundance of dark energy caused expansion to accelerate. 



Fred Hoyle, an English cosmologist, was the first to call this process the Big Bang. He wanted to denigrate the theory as the "Big Bang," but the catchy "Big Bang" quickly gained popularity. It is misleading to describe this process as a kind of explosion of matter at a certain point in space. 

An important property of the Big Bang makes it unique. Unlike the explosion of an artificial bomb that expands the air, the Big Bang did not expand outward. Instead, space has increased since the dawn of time. Physicists believe the explosion itself created a part of space that expanded the universe. 


For centuries, scientists thought that the universe existed in unchanged form and, thanks to the laws of physics, ran like clockwork. Then a Belgian priest and scientist named George Lemaitre came up with an idea. In 1927, he suggested that the universe began as a large, pregnant primordial atom that exploded, emitting the small atoms we see today. In 1929, astronomer Edwin Hubble discovered that the universe was not static, but was expanding. 


In 1912, Vesto Slipher measured the first Doppler shift of a spiral nebula (the term spiral galaxy is now obsolete as a term for spiral galaxies) and discovered that such nebulae retreated from Earth. Slipher did not understand the cosmological implications of this development at the time, and it is still debatable whether these spiral galaxies are islands in the universe, like our Milky Way. The Big Bang theory was developed from observations of the structure of the universe and theoretical considerations.  

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