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The heat and light energy from the Sun is due to the fusion of hydrogen atoms at a very high temperature and pressure.

太阳的光能和热能是由于氢原子在极高的温度和压力下发生核聚变的缘故。

The star used to be like the sun, a "main sequence" star that burns hydrogen by nuclear fusion, producing helium.

这颗恒星曾和太阳一样，是颗“主序星”（“mainsequence”）。它通过核聚变燃烧氢，从而产生氦。

Instead of fusion taking place in the stellar core, it fizzles towards the surface.

这时核聚变将在恒星表面发生，而不再是其在核心了。

Massive stars normally die when they run out of material to sustain nuclear fusion, and all that's left in their cores is inert iron.

大质量恒星死亡时，它们通常运行的材料进行维持核聚变，以及所有在其核心的左边是惰性铁。

It's easy to see why: nuclear fusion powers the sun, and it holds out the possibility of near-limitless electricity, without pollution.

很容易知道原因：核聚变为太阳提供能量，也为一种近乎无限的无污染的电提供了可能。

Quantum tunneling is involved in many physical processes, such as radioactive decay and the nuclear fusion that takes place in the Sun.

量子隧穿发生在许多的物理过程中，比如说放射性衰变和太阳上发生的核聚变。

But to effectively use the energy released by nuclear fusion, nuclear fusion must be able to reasonably control the speed and scale.

但要想有效利用核聚变释放的能量，必须能够合理地控制核聚变的速度和规模。

But most stars are not massive enough to create the pressures and heat necessary to burn heavy elements, so fusion and heat production stop.

不过大多数恒星都没有足够的质量以产生燃烧重元素所需的压力与热能，所以核聚变与热能产生过程都停止了。

A large amount of nuclear energy is produced when a heavy nucleus splits in two light nuclei join to form a heavier nucleus(nuclear fusion).

当一个重核子分裂成两个结合在一起形成一个更重核子的轻核子时，释放巨大的能量（核聚变）。