What is the oldest thing in the universe?
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According to the best cosmic evidence we’ve been able to assemble, we can precisely determine the age of the Universe to be 13.8 billion years since the start of the hot Big Bang, with an uncertainty of just ~1%. And yet, we know how stars work, and astronomers have estimated the age of the Methuselah star, found right here in the Milky Way, to be 14.5 billion years old: significantly older than the cosmos itself. Clearly, you can’t have a star within the Universe that’s older than the Universe itself. But what is it that’s wrong: our estimates for the star’s age, the Universe’s age, or something else entirely?