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It is always a mystery about how the universe began whetherif and when it will end Astronomers construct hypotheses calledcosmological models that try to find the answer There are twotypes of models Big Bang and Steady State However throughmany observational evidences the Big Bang theory can bestexplain the creation of the universe The Big Bang model postulates that about 15 to 20 billionyears ago the universe violently exploded into being in anevent called the Big Bang Before the Big Bang all of thematter and radiation of our present universe were packed togetherin the primeval fireball--an extremely hot dense state from whichthe universe rapidly expanded1 The Big Bang was the start oftime and space The matter and radiation of that early stagerapidly expanded and cooled Several million years later itcondensed into galaxies The universe has continued to expandand the galaxies have continued moving away from each other eversince Today the universe is still expanding as astronomers The Steady State model says that the universe does notevolve or change in time There was no beginning in the pastnor will there be change in the future This model assumes theperfect cosmological principle This principle says that theuniverse is the same everywhere on the large scale at alltimes2 It maintains the same average density of matter forever There are observational evidences found that can prove theBig Bang model is more reasonable than the Steady State model First the redshifts of distant galaxies Redshift is a Dopplereffect which states that if a galaxy is moving away the spectralline of that galaxy observed will have a shift to the red end The faster the galaxy moves the more shift it has If thegalaxy is moving closer the spectral line will show a blueshift If the galaxy is not moving there is no shift at all However as astronomers observed the more distance a galaxy islocated from Earth the more redshift it shows on the spectrum
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