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It is always a mystery about how the universe began whether if and when it will end Astronomers construct hypotheses called cosmological models that try to find the answer There are two types of models Big Bang and Steady State However through many observational evidences the Big Bang theory can best explain the creation of the universe The Big Bang model postulates that about 15 to 20 billion years ago the universe violently exploded into being in an event called the Big Bang Before the Big Bang all of the matter and radiation of our present universe were packed together in the primeval fireball--an extremely hot dense state from which the universe rapidly expanded1 The Big Bang was the start of time and space The matter and radiation of that early stage rapidly expanded and cooled Several million years later it condensed into galaxies The universe has continued to expand and the galaxies have continued moving away from each other ever since Today the universe is still expanding as astronomers have observed The Steady State model says that the universe does not evolve or change in time There was no beginning in the past nor will there be change in the future This model assumes the perfect cosmological principle This principle says that the universe is the same everywhere on the large scale at all times2 It maintains the same average density of matter forever There are observational evidences found that can prove the Big Bang model is more reasonable than the Steady State model First the redshifts of distant galaxies Redshift is a Doppler effect which states that if a galaxy is moving away the spectral line of that galaxy observed will have a shift to the red end The faster the galaxy moves the more shift it has If the galaxy is moving closer the spectral line will show a blue
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