The star that exploded that year was just on the edge of the theoretical mass limit for forming black holes, about 20 times the mass of the sun.
爆炸的恒星其质量接近形成黑洞的理论质量极限，即太阳质量的20倍左右。
The known sample is not large enough to determine a firm upper mass limit, which would in turn give more detailed insight into the physics of such extremely dense forms of matter.
这些已知的样本还不足以确定一个严格的质量上限，而这个上限可以帮助我们进一步了解这些极高密度的物质的物理特性。
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