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Essay Galaxy - The Big Bang
The Big Bang
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 ga....
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Number Of Pages: 5 |
Number Of Words: 1297 |
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