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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 moving away from each other ever
since.......

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Approximate Word Count: 1151
Approximate Pages: 5 (250 words per double-spaced page)

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