每日口說挑戰 要是你口袋裡有黑洞的話會發生什麼事呢 (What if there was a black hole in your pocket?)

今日挑戰句子

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。