Big Bang Theory
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 ...
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in the future. This model assumes the perfect cosmological
principle. This principle says that the universe is the same everywhere
on the large scale, at all times.2 It maintains the same average density
of matter forever.
There are observational evidences found that can prove the Big Bang
model is more reasonable than the Steady State model. First, the
redshifts of distant galaxies. Redshift is a Doppler effect which states
that if a galaxy is moving away, the spectral line of that galaxy observed
will have a shift to the red end. The faster the galaxy moves, the more
shift it has. If the galaxy is moving closer, the spectral line will show
a blue shift. If the galaxy is not moving, there is no shift at all.
However, as astronomers observed, the more distance a galaxy is located
from Earth, the more redshift it shows on the spectrum. This means the
further a galaxy is, the faster it moves. Therefore, the universe is
expanding, and the Big Bang model seems more ...
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never be known. However, recent theoretical
breakthroughs, based on the principles of quantum theory, have suggested
that space, and the matter within it, masks an infinitesimal realm of
utter chaos, where events happen randomly, in a state called quantum
weirdness.4
Before the universe began, this chaos was all there was. At some
time, a portion of this randomness happened to form a bubble, with a
temperature in excess of 10 to the power of 34 degrees Kelvin. Being that
hot, naturally it expanded. For an extremely brief and short period,
billionths of billionths of a second, it inflated. At the end of the
period of inflation, the universe may have a diameter of a few ...
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Big Bang Theory. (2008, February 4). Retrieved November 28, 2024, from http://www.essayworld.com/essays/Big-Bang-Theory/78525
"Big Bang Theory." Essayworld.com. Essayworld.com, 4 Feb. 2008. Web. 28 Nov. 2024. <http://www.essayworld.com/essays/Big-Bang-Theory/78525>
"Big Bang Theory." Essayworld.com. February 4, 2008. Accessed November 28, 2024. http://www.essayworld.com/essays/Big-Bang-Theory/78525.
"Big Bang Theory." Essayworld.com. February 4, 2008. Accessed November 28, 2024. http://www.essayworld.com/essays/Big-Bang-Theory/78525.
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