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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. 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......

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Approximate Word Count: 1339
Approximate Pages: 6 (250 words per double-spaced page)

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