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It is always a mystery about how the universe began whether if andwhen it will end Astronomers construct hypotheses called cosmologicalmodels that try to find the answer There are two types of models BigBang and Steady State However through many observational evidences theBig Bang theory can best explain the creation of the universe The Big Bang model postulates that about 15 to 20 billion years agothe universe violently exploded into being in an event called the BigBang Before the Big Bang all of the matter and radiation of our presentuniverse were packed together in the primeval fireball--an extremely hotdense state from which the universe rapidly expanded1 The Big Bang wasthe start of time and space The matter and radiation of that early stagerapidly expanded and cooled Several million years later it condensedinto galaxies The universe has continued to expand and the galaxies havecontinued moving away from each other ever since Today the universe isstill expanding as astronomers have observed The Steady State model says that the universe does not evolve orchange in time There was no beginning in the past nor will there bechange in the future This model assumes the perfect cosmologicalprinciple This principle says that the universe is the same everywhere onthe large scale at all times2 It maintains the same average density of There are observational evidences found that can prove the Big Bangmodel is more reasonable than the Steady State model First the redshiftsof distant galaxies Redshift is a Doppler effect which states that if agalaxy is moving away the spectral line of that galaxy observed will havea shift to the red end The faster the galaxy moves the more shift it hasIf the galaxy is moving closer the spectral line will show a blue shiftIf the galaxy is not moving there is no shift at all However asastronomers observed the more distance a galaxy is located from Earth themore redshift it shows on the
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