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what is the age of the universe?
The age of the universe is defined in physical cosmology as the time elapsed since the Big Bang. The best estimate of the age of the universe is 13.75 ± 0.11 billion years[Measurements by the WMAP satellite can help determine the age of the universe. The detailed structure of the cosmic microwave background fluctuations depends on the current density of the universe, the composition of the universe and its expansion rate. As of 2013, WMAP determined these parameters with an accuracy of better than than 1.5%. In turn, knowing the composition with this precision, we can estimate the age of the universe to about 0.4%: 13.77 ± 0.059 billion years.


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