在这个极限点上，其中心压力将变得如此巨大，以至于爆发失控的核聚变，而恒星则爆炸成为热核爆炸型超新星。

At this point the pressure at its center will become so great that runaway fusion occurs and the star will detonate in a thermonuclear supernova.

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这类名为Ia型的超新星爆发由于可以在很远的距离上被观测到，并且亮度遵循可靠的模式，它们被当成测量宇宙膨胀的里程计。

These supernovae, called Type 1a, serve as cosmic mile markers to measure expansion of the universe because they can be seen at large distances, and they follow a reliable pattern of brightness.

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大多数科学家认为，当白矮星(年老恒星坍缩而成的残骸)超过质量极限，变得不稳定并爆发的时候，会产生Ia型超新星。

Most scientists agree a Type 1a supernova occurs when a White Dwarf star — a collapsed remnant of an elderly star — exceeds its weight limit, becomes unstable and explodes.

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