留美老師帶你每日說英文第419期:和硬幣一樣直徑的黑洞

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臺灣籍旅美老師今天交給我們的句子是：

In fact, a black hole with the diameter of a nickel would be slightly more massive than the Earth. It would have a surface gravity a billion billion times greater than our planet currently does.
事實上，和硬幣一樣直徑的黑洞其質量比地球還稍稍重一些，它的表重力，比我們現在的星球還大上數百億倍。