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Dating the stars: most accurate red giant age yet

Scientists identify stars leftover from cosmic collision.

Two orange balls with the centre cut out. One is small and one is big. The big one has a small white ball in it, and the small orange ball has a large white ball in it.
Artist's impression of the structure of a solar-like star and a red giant. The two images are not to scale - the scale is given in the lower right corner. Credit: Wikimedia Commons.
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