How is the Big Bang Theory explained?
An overwhelming weight of evidence has convinced cosmologists that the universe came into existence at a definite moment in time, some 13 billion years ago, in the form of a superhot, superdense fireball of energetic radiation. This is known as the Big Bang theory. Until the arrival of the Big Bang theory the universe was believed to be essentially eternal and unchanging, represented by the Steady State model. The first clear hint that the universe might change as time passes came in 1917 when Albert Einstein developed his General Theory of Relativity. Einstein realised that his equations said that the universe must be either expanding or contracting, but it could not be standing still, because if it were then gravity would attract all the galaxies towards one another.
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