HE 1523-0901是一顆位於天秤座的紅巨星,它在銀河系內,距離地球大約7500光年。它被認為是一顆第二星族星(或貧金屬星)為目前發現年齡最老的恆星([Fe/H] = −2.95)。它的質量為太陽的0.8倍。通過歐洲南方天文台的甚大望遠鏡測量出為132億年,而宇宙年齡大約為137億年。
![Thumb](http://upload.wikimedia.org/wikipedia/commons/5/5f/He1523a.jpg)
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