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HD 140283. ঊতসঃ http://www.slate.com/blogs/bad_astronomy/2014/09/26/oldest_star_astronomers_have_found_the_most_ancient_known_star.html
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HD 140283. ঊতসঃ http://www.slate.com/blogs/bad_astronomy/2014/09/26/oldest_star_astronomers_have_found_the_most_ancient_known_star.html