Anamika PrajapatKnowledge Contributor
How is the universe 13.7 billion years old?
How is the universe 13.7 billion years old?
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We do not know the exact age of the universe, but we believe that it is around 13 billion years – give or take a few billion. Astronomers estimate the age of the universe in two ways: (a) by looking for the oldest stars; and (b) by measuring the rate of expansion of the universe and extrapolating back to the Big Bang.