More than 70 miners were killed in the initial blast.
在最初的爆炸中，有70多名矿工遇难。
The expanding ring carries with it another great mystery, however: why wasn't this supernova seen 400 years ago when light from the initial blast should have passed the Earth?
关于这个正在膨胀的圆环，还有一个不为人知的秘密——400年前，当这颗超新星开始爆发，为什么地球上没人注意到？
The expanding ring carries with it another great mystery, however: why wasn't this supernova seen 400 years ago when light from the initial blast should have passed the Earth?
关于这个正在膨胀的圆环，还有一个不为人知的秘密——400年前，当这颗超新星开始爆发，为什么地球上没人注意到？
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