约 23 亿岁：天文学家测定距地球约 57 光年的褐矮星 HR 7672 年龄
IT之家 5 月 8 日消息，夏威夷大学天文研究所团队借助凯克天文台（W. M. Keck Observatory）和凯克行星探测器（KPF），给 HR 7672 系统中的一颗褐矮星定出了较精确年龄。 褐矮星（brown dwarf）常被称为“失败的恒星”，是质量介于行星和恒星之
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