translation.en: You can work it out on a piece of paper in a laboratory, get a telescope, swing it to the sky, and you find that there are no dead stars bigger than 1.4 times the mass of the Sun.
translation.zh: 你可以在实验室里拿张纸算出来， 或者用个望远镜，对着天空 你就会发现，没有质量超过太阳1.4倍 的死亡恒星。