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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 13.772 ± 0.059 billion years (4.346?±?0.019 *1017 seconds) within the Lambda-CDM concordance model. The uncertainty of 59 million years has been obtained by the agreement of a number of scientific research projects, such as microwave background radiation measurements by Wilkinson Microwave Anisotropy Probe and other probes. Measurements of the cosmic background radiation give the cooling time of the universe since the Big Bang, and measurements of the expansion rate of the universe can be used to calculate its approximate age by extrapolating backwards in time.


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