Four Pillars of Big Bang Theory

Topics: Big Bang, Universe, Physical cosmology Pages: 4 (1138 words) Published: November 23, 2013

“The evolution of the world can be compared to a display of fireworks that has just ended; some few red wisps, ashes and smoke. Standing on a cooled cinder, we see the slow fading of the suns, and we try to recall the vanishing brilliance of the origin of the worlds.” (Four Pillars, n.d.) The Big Bang theory is perhaps the greatest discovery of all time. The Big Bang is a cosmological model that explains how the universe came to be and is based on known and well-tested laws of physics. However, the Big Bang theory does not explain why the universe was created. Three particular observations led scientists to believe in the standard hot Big Bang model: The expansion of the universe, the cosmic background of radiation and the abundance of light elements. Before these discoveries were made, the Big Bang model was highly controversial and various alternative models existed. It will become evident that the Big Bang theory lays down the framework for the evolution of the universe.

One of the most significant observations is that the universe is expanding. When Einstein applied his theory of general relativity, he found that it predicted an expanding or contracting universe. (Expanding universe, n.d.) This caused Einstein to add a cosmological constant to his equations that made his calculations consistent with a static universe. (Expanding universe, n.d.) Einstein admitted this was a great mistake when Edwin Hubble demonstrated that the more distant a galaxy is from earth, the greater its redshift and therefore the faster it moves away from us. The velocity of galaxies that are moving away from us can be given by an equation known as Hubble’s law: v = H*d. (Martin White, n.d.) Where V represents velocity, H represents Hubble’s constant and D represents distance. (Martin White, n.d.) In essence, Hubble’s constant sets the rate at which the universe is expanding. The implication of the expanding universe hypothesis is that all matter and energy must have been...

Cited: Bryson, B. (2012). A Short History of Nearly Everything Quotes. Retrieved November 6,
2012, from http://www.goodreads.com/work/quotes/2305997-a-short-history-of-nearly-
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