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The Red Giant Star HE1523
The HE1523 red giant star is 13.2 billion years old and has a huge overload of very heavy elements. The thorium and uranium abundance was the second of its kind, so we had a better grasp on that. Thorium has a half life of 14 billion years, I believe, and uranium of 4.7,. Those kind of timelines are good when you want to explore the early universe.