Jisho

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宇宙年齢
Wikipedia definition
1. Age of the universeThe age of the universe is the time elapsed since the Big Bang. The best current estimate of the age of the universe is 13.75 ± 0.11 billion years (4.339 x 10 seconds) within the Lambda-CDM concordance model. The uncertainty range of 0.11 billion 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.
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