All that carbon and oxygen — byproducts of the helium fusion process — build up in its core. At that point the star will shed its outer layers and the core will form a White Dwarf.

所有氦聚变中的附产物碳和氧在它的核心逐渐积聚，这期间它将失掉较外层物质，核心最终枯萎成为白矮星。

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It also bodes ill for the prospect of fusion using helium-3, a rare helium isotope that is missing a neutron.

这也预示着，利用氦- 3这种缺少一个中子的稀有的氦同位素进行核聚变的前景很黯淡。

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Helium-3 has one less neutron than regular helium (helium-4) and is also produced in the sun and almost as quickly consumed in fusion reactions as deuterium.

氦- 3比普通氦(氦- 4)少一个中子，并且同样在太阳里产生然后象氘一样在核聚变中迅速被消耗掉。

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At such temperatures atoms are stripped down to their electrically charged components, so the helium created by fusion remains within the magnetic bottle.

ECONOMIST: Nuclear fusion

"It is dubious whether it will ever be economically viable even if nuclear fusion works commercially or if helium-3 is a better option than other elements available on earth, " he told CNN.

CNN: Mining the moon for a nuclear future

But the Moon is a source of rare earth elements, as well as Helium-3, a possible future fuel for nuclear fusion reactors (if we ever actually invent them).

FORBES: Richard Branson Wants a Population on Mars. Here's How He Can Create It.