Presumed young star turns out to be a galactic senior citizen

49 Lib, a relatively bright star in the southern sky, is twelve billion years old rather than just 2.3 billion. For many decades, researchers were stumped by conflicting data pertaining to this celestial body, because they had estimated it as much younger than it really is. Determining its age anew, astronomers have now successfully resolved all inconsistencies.

(via WSJ)

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