Neutron stars are the extremely dense remnants of supermassive stars that have exploded as supernovae.

中子星是极其密集的超大质量星体爆炸后残留下来的物体，这些星体曾经是超新星。

The first-generation stars were supermassive stars with masses ranging from 140 to 260 times that of the Sun, making them the oldest stars in the universe.

第一代恒星是质量为太阳 140 倍至 260 倍的超大质量恒星，是宇宙中最古老的恒星。