The Big Bang Theory is the most widely accepted cosmological model of evolution of our universe. According to this theory, the universe started out as a hot and extremely dense mass, which represented a singularity. This dense mass started expanding and continues to expand today. Over time, the universe cooled down sufficiently and matter (as we know it today) formed and over time, planets, stars, and other celestial bodies formed. The expansion of universe has been confirmed by the observation of red shift of galaxies, first discovered by Edwin Hubble. Another evidence for big bang theory is the discovery of cosmic microwave background radiation by Arno Penzias and Robert Wilson. It has been hypothesized that the big bang took place around 13.8 billion years ago and that is the age of our universe.
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