Big Bang Theory

Tuesday, 05 Oct 2010 04:13 PM

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The Big Bang Theory is one of the scientific theories proposing the probable events that led to the formation of the universe. According to one of the scientific theories in cosmology, the Big Bang theory says that the universe was initially in a hot and dense state. One day it started expanding and is still expanding. It shall be cooled to nothing one day.

George Lemaitre proposed the Big Bang Theory as an explanation for one of the mysteries of the universe. The Big Bang Theory suggesting an expanding universe is based on Einstein's theory of relativity, and is one of the most comprehensive and precise explanations provided in cosmology.
 
The Big Bang Theory depends on two major assumptions: the universality of physical laws and the cosmological principle. The cosmological principle states that the universe on large scales is homogenous and isotropic.
 
The Big Bang Theory does not mean, as the name suggests, the explosion of matter to fill an outward empty universe, but implies the expansion of space with time and ever expanding, two commoving points on a proportional scale factor of the Universe.

The important feature of this theory is the expansion of big bang space-time in the presence of horizons. As the age of the universe is finite and light travels at a finite speed, this defines a future horizon for the universe.

Some of the direct and observational evidence of the Big Bang Theory are Hubble-type expansion seen as Red Shift in the galaxy, detailed measurements of cosmic microwave background, abundance of light elements, and large-scale distribution, and apparent evolution of other galaxies. These are the various ways that the Big Bang Theory was studied and evaluated in cosmology.

In the field of cosmology, the universe expanding is explained using the big bang model. However, with the overwhelming support and prominence of the big bang model, the universe expanding via alternative models in cosmology is not well explained.

The core ideas of the Big Bang are the expansion, the early hot state, the formation of helium, and the formation of galaxies, which are derived from various derivations and observations.

This model for the universe expanding is well established in cosmology. The universe is predicted to end on reaching infinity with a big crunch, or alternatively, if the universe is going to be equal or below a critical density, then expansion will slow down. In addition, star formation would cease, and in the end a star will burn out leaving white dwarfs, neutron stars, and black holes.

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