Ask Ethan: How do we know the Universe is 13.8 billion years old?

Ask Ethan: How do we know the Universe is 13.8 billion years old?

Ask Ethan: How do we know the Universe is 13.8 billion years old? - After over a century of debate over the age of the Universe, including a period of decades where many argued that the Universe was infinitely old, we finally know its age: 13.8 billion years. - There are a number of challenges to this claim: from some who claim the expanding Universe's uncertainty can change its age to those who claim to have found stars older than …