The universe as we know it today had a beginning, therefore it has an age. According to the current observational results (such as CMB), the universe was born 13.8 billion years ago. This is the event (t=0) we call the BIG BANG. The Big Bang is a point (not specific location) in the very early universe, where spacetime came into existence and it has been expanding ever since. Following Big Bang, is the Planck era, an era where all of the fundamental forces of nature (Gravitational, Strong, Weak, Electromagnetic Forces) where unified into one enormous force. This era took place place sometime around 10^(-43)s, the temperature of the universe were around 10^(15)GeV. Much less is know about the underlying physics at this point, due to inconsistency of the two fundamental pillars of the 21th century; Quantum mechanics and Theory of General Relativity. Then we have a Grand United Era (at around 10^(-36s), where gravitational force disintegrate from the other three fundamental forces. Little is known about the process causing this disintegration (Physicists call this process symmetry breaking). At T=10^(28)k, strong force separates out from the electroweak force and this catalysed another regime that of rapid exponential expansion of the universe known as Inflation. The Standard Big Bang model has some flaws that needs resolution, this is provided by the inflationary model. Most of the predictions of the inflationary model has been verified so far, but it has it's own problems that needs to be resolved. What happened next is the know as the Early Universe, which shall be explored in the next very short article!
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