Cosmic radiation is the key to find out what happened in the early universe. From an instance our newlycreateduniverse which is billion times smaller than atom expands. Scientists call this rapid expansion Inflation. Inflation expands our universe uniformly. The evidence of inflation is cosmic radiation left by the Big Bang. Cosmic radiation is so uniform throughout the universe it seems unbelievable to the scientists. The temperature of one region of cosmic microwave background (CMB) is same as the other region. It leaves only one explanation. Our universe inflates faster than the speed of the light. But according to Einstein nothing can travel faster than light. Then how it is possibe that inflation rate was faster than light speed. It is another mystery of our universe yet to be solved!!