adsl said – Thu, 09 Oct 2008 12:03:53 -0000 ( Link )
Big Bang Theory is related to discuss the creation of the universe. This theory was born of the observation that other galaxies are moving away from our own at a great speed, in all directions, as if they had all been propelled by an ancient explosive force. Before Big Bang, scientists believe, the entire vastness of the observable universe, including all of its matter and radiation, was compressed into a hot, dense mass just a few millimeters across. This nearly incomprehensible state is theorized to have existed for just a fraction of the first second of time. Big Bang proponents suggest that some 10 billion to 20 billion years ago, a massive blast allowed all the universe’s known matter and energy—even space and time themselves—to spring from some ancient and unknown type of energy. The theory maintains that, in the instant a trillionth—trillionth of a second after the big bang, the universe expanded with incomprehensible speed from its pebble-size origin to astronomical scope. Expansion has apparently continued with accelerating velocity. Astronomers say that within whole universe only 10% is visible and the rest 90% is unknown even now which is called “Dark Matter”. The characteristics of the dark matter is not similar to our known particle, but it is probably weakly interacting massive particle. These particles are so that they response to only one force out of four kinds of forces in our universe. Probably the force is generated by the unity of four kinds of forces(Gravitational force, Weak force, Electromagnetic force& Strong force) is responsible for the expansion of the universe.
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