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The Big Bang - Origin of Universe

What is Big Bang ?

The Big Bang was an explosion of all the matter in the universe about 15,000,000,000 years ago, which was squashed into a tiny area at more than 10,000,000 0C. The matter exploded so quickly that within the hundredth of a second, the universe was as big as the Sun ! It carried on growing.

The first few seconds

Before the Big Bang, there was nothing that we would recognize as physical material, not even atoms. In the first ten-thousandth of a second of this explosion, unimaginably high temperature and density helped to create some of the first building blocks from which atoms are formed. These pieces of matter are known today as quarks and mesons.

As the Big Bang hurled this primitive material outwards in all directions, the temperature and the density began to fall. The building blocks began to stick together to form the sub-atomic particles - protons and neutrons that are at the core of atoms. Only ten seconds had passed. The primal material continued to fly outwards on the wings of the explosion.

After the Big Bang

After the Big Bang, with temperatures of at least 10,000,000 0C, nuclear reactions started to create the basic structures of the gases hydrogen and helium. Over the next million years, the radiated energy of light and head stemmed from the original explosion. The long process of the formation of the first stars began.

At first, the new atoms joined up into a thin cloud of hot gas. The radiation that kept the atoms moving eventually weakened as millions of years passed. Atoms began to cluster together. Eventually, what had been an evenly distributed gas cloud became a large number of huge, separate clumps of gas. All objects in the universe exert the force of gravity. It played a major part, first in the grouping of the gas globules that would become clusters of galaxies, and eventually in the formation of the stars within the galaxies.
 
     
 
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