这种疾病的零星爆发令调查者们担心。
The sporadic outbreaks of the disease have worried the researchers.
超新星爆发以后，剩余的物质可能塌缩为一个黑洞，也可能形成一颗密度极大的中子星。
After the supernova, the leftover matter could either have collapsed into a black hole or an extremely dense neutron star.
近期的恒星形成本身似乎由星风和超新星爆发触发，来自前代大质量恒星，清除和压缩了分子气体。
The recent star formation itself was likely triggered by winds and supernova explosions, from previous generations of massive stars, that swept up and compressed the molecular gas.
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