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The Universe
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The Universe 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 expanded.1 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 expand,and the galaxies have continued moving away from each other eversince. Today the universe is still expanding, as astronomershave observed. The Steady State model says that the universe does notevolve or change in time. There was no beginning in the past,nor 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 alltimes.2 It maintains the same average density of matter forever. There are observational evidences found that can prove theBig Ban...
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