科研之友
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<正>当一颗恒星衰老时,它已经耗尽了燃料,再也没有足够的力量来承担起外壳巨大的重量。所以核心开始坍缩,直到最后形成体积接近无限小、密度几乎无限大的"黑洞"。Unlike a hole in your sock, a black hole is not an opening; it’s a place in space where gravity pulls so much that even light can not get out.When a big star—much more massive than our Sun—uses up all its fuel after a few mil-
