What characteristic of HD 140283 confirms its primordial heritage as a very old star?

Answer

Its extreme metal-poor composition

The star is extremely metal-poor, containing only about one-tenth the concentration of iron found in our Sun, which confirms that it formed before successive generations of stars had time to disperse heavy elements.

What characteristic of HD 140283 confirms its primordial heritage as a very old star?

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This Star Is Older Than The Universe and Scientists Can't Explain It

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