In the meantime, helium fusion isn't very stable, to say the least.

与此同时，至少可以说，氦聚变并不十分稳定。

This resistance is phenomenally strong, and becomes the dominant force in supporting the core of a star once helium fusion stops.

这种阻力非常强大，一旦氦聚变停止，它就会成为支撑恒星核心的主要力量。

At some point, the core contracts and heats up so much that the conditions will finally be primed for helium fusion.

在某一时刻，核心会收缩和升温，最终为氦聚变提供了条件。

Like the Sun, though, a massive star changes when hydrogen fusion stops, its core contracts, and then helium fusion begins.

和太阳一样，当氢聚变停止时，大质量恒星会发生变化，它的核心收缩，然后开始氦聚变。

Hydrogen fusion makes helium, helium fusion makes carbon, and each heavier element, in general, takes higher temperatures and pressures to fuse.

氢聚变产生氦，氦聚变产生碳，一般来说，每一种较重的元素需要更高的温度和压力才能进行聚变。

The Sun will probably undergo a series of tremendous paroxysms, epic eruptions as the helium fusion spikes, creating huge surges in energy production.

随着氦聚变的爆发，太阳可能会经历一系列巨大的爆发，产生巨大的能量。

When helium fusion stops, the Sun's core will have about half the mass of what the Sun does today: the rest will have blown away into space around it.

当氦聚变停止时，太阳核心的质量将只有今天太阳质量的一半：剩下的将被吹散到它周围的太空中。