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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 expanded.1 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......

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Approximate Word Count: 1232
Approximate Pages: 5 (250 words per double-spaced page)

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