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Age of the universe
Part of a series on Physical cosmology Universe Big Bang Age of the universe Chronology of the universe Inflation Nucleosynthesis GWB Neutrino background Cosmic microwave background Redshift Hubble's law Metric expansion of space Friedmann equations FLRW metric Shape of the universe Structure formation Reionization Galaxy formation Large quasar group Large-scale structure Galaxy filament Ultimate fate of the universe Future of an expanding universe Lambda-CDM model Dark energy Dark matter Timeline of cosmological theories History of the Big Bang theory Discovery of cosmic microwave background radiation Observational cosmology 2dF SDSS COBE BOOMERanG WMAP Planck Galileo Copernicus Newton Einstein Hawking Friedman Lemaître Hubble Penzias Bharadwaj Tolman Wilson Gamow Dicke Zel'dovich Aaronson Alpher Mather Rubin Penrose Alfvén Smoot Ehlers Ellis Sunyaev Schmidt Suntzeff de Sitter Guth others Religious interpretations Astronomy portal  Category: Physical cosmology v t e In physical cosmology, the age of the universe is the time elapsed since the Big Bang. The best measurement of the age of the universe is 13.798±0.037 billion years ((13.798±0.037)×109 years or (4.354±0.012)×1017 seconds) within the Lambda-CDM concordance model. The uncertainty of 37 million years has been obtained by the agreement of a number of scientific research projects, such as microwave background radiation measurements by the Planck satellite, the 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. Cite error: There are tags on this page, but the references will not show without a {{reflist}} template (see the help page).
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