Passage: NASA's Wilkinson Microwave Anisotropy Probe (WMAP) project's nine-year data release in 2012 estimated the age of the universe to be (13.772±0.059) ×109 years (13.772 billion years, with an uncertainty of plus or minus 59 million years).However, this age is based on the assumption that the project's underlying model is correct; other methods of estimating the age of the universe could give different ages. Assuming an extra background of relativistic particles, for example, can enlarge the error bars of the WMAP constraint by one order of magnitude.This measurement is made by using the location of the first acoustic peak in the microwave background power spectrum to determine the size of the surface of the decoupling (size of the universe at the time of recombination yield).The age is based on the assumption that the project's underlying model is correct; other methods of estimating the age of the universe could give different ages. However, this age is based on the assumption that the underlying model of the project is correct
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