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霍金逝世一周年，英国皇家铸币厂发售“黑洞”纪念币
source link: https://tech.sina.com.cn/d/i/2019-03-14/doc-ihrfqzkc3837995.shtml
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（观察者网讯）英国皇家铸币厂12日发行了一枚面额“50便士”（约4.4元人民币）的纪念币，上面刻着黑洞、霍金的名字，以及贝肯斯坦与霍金共同提出的黑洞熵公式S=kc？A/4？G，以此纪念科学家史蒂芬·霍金（1942.1.8-2018.3.14
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