"The universe is commonly defined as the totality of everything that exists, including all matter and energy, the planets, stars, galaxies, and the contents of intergalactic space. Definitions and usage vary and similar terms include the cosmos, the world and nature. Scientific observation of earlier stages in the development of the universe, which can be seen at great distances, suggests that the universe has been governed by the same physical laws and constants throughout most of its extent and history. There are various multiverse theories, in which physicists have suggested the universe is one among many universes that likewise exist." (Wikipedia)
Universe is defined as, the whole system of existing things, including the earth and everything on it, outer space, and all heavenly bodies. Theories were developed to explain its origin. The Steady State, Plasma theory, Inflation Universe, Big Bounce, Cyclic Universe, Big Bang theory. Among them, the most widely known is the Big Bang Theory.
They say that everything was quiet until a cataclysmic explosion occurred hurling materials in all direction. this bang marked the birth of the universe. there were no galaxies and even atoms at that time except for a dense, very hot (estimated to be 10^32 degrees Celsius) and massive ball, the universe. As time passed, that ball started to expand. its rapid expansion caused it to cool and as it cooled its particles slowed down. The basic components of now began to form. For the next hours, it cooled up to ten million degrees Celsius and the protons and neutrons combined causing the formation of helium, the element that we can find now in the universe. The cooling didn't stopped and reached the temperature of 3000 degrees Celsius and electrons combined with nuclei to form neutral atoms. it took another billion of years for gravity to form the first stars and early galaxies.
Universe until now remains a mystery and man still seek for further information to answer the questions on their minds and they would not stop until they are contented.
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