It is generally a mystery about how the universe started, whether if and when it will end. Astronomers construct hypotheses called cosmological models that try to discover the answer. There are two kinds of models: Significant Bang and Steady State. Nevertheless, by way of a lot of observational evidences, the Large Bang theory can best clarify the creation of the universe.
The Major Bang model postulates that about 15 to 20 billion years ago, the universe violently exploded into becoming, in an event known as the Significant Bang. Prior to the Massive Bang, all of the matter and radiation of our present universe have been packed with each other in the primeval fireball-an exceptionally hot dense state from which the universe quickly expanded.1 The Big Bang was the begin of time and space. The matter and radiation of that early stage swiftly expanded and cooled. Various million years later, it condensed into galaxies. The universe has continued to expand, and the galaxies have continued moving away from each and every other ever since. Right now the universe is nonetheless expanding, as astronomers have observed.