Big bang

The knowledge itself that the universe exists has not satisfied mankind's curiosity for further understanding. One of the most common asked questions is how the universe was created. Most people believed that the universe had no beginning or end.
The Big Bang theory is the dominant scientific theory about the origin of the universe. According to the Big Bang the universe was created about 10-20 billion years ago from a tremendous cosmic explosion that send matter and energy in all directions. At the point of the explosion all the matter of the space was contained at one point.
Before the Big Bang the entirety of the universe was contained into the confines of an atomic nucleus. This is known as singularity and this was the condition of the universe before its creation when time and space did not exist.
In 1927, the Belgian priest George Lamaitre was thefirst person who proposed that the universe began with the explosion of a primeval atom. The proposal of that theory came due to the observation of red shift in distant nebulas by astronomers to a model of universe based on relativity.
Nevertheless, the origin of the Big Bang theory is credited to Edwin Hubble. Hubble made the observation that the universe is continuously expanding. He discovered that a galaxy's velocity is proportional to its distance. That means that galaxies that are twice as far from the earth move twice as fast.
Since the Big Bang, the universe has been continuously expanding and thus there has been more distance between clusters of galaxies. This phenomenon of galaxies moving further away from each other is known as the red shift. As light from distant galaxies approaches the earth there is an increase of space between the earth and the galaxy, which means that wavelengths have been stretched.The Big Bang explains why distant galaxies are travelling away from us at great speed.
Also, the theory predicts the existence of cosmic background…

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