After that it is expected to become a red giant, as the hydrogen that presently comprises it is exhausted and the sun switches to burning helium instead.
之后，据推测太阳会成变成一颗红巨星，因为到那时候现在构成太阳的氢气燃烧殆尽，太阳转而燃烧氦气。
When a star similar to the sun fuses most of its hydrogen into helium, then the helium into carbon, the star becomes unstable and puffs out into a red giant.
当一颗类日恒星大部分的氢聚变为氦，氦又聚变成碳的时候，它就变得不再稳定，而膨胀成一颗红巨星。
Of course, in about five-billion years, our Sun will become a red giant and likely will swallow up the inner planets and the planets' accompanying moons.
当然，在大约50亿万年内，我们的太阳将会变成一颗红巨星，并且很可能将吞噬掉内行星和这些行星的卫星。
The sun will then become what's called a red giant, and its radius will reach just past the orbit of Venus.
太阳就变成了所谓哦红巨星，它的半径将会达到以前金星的运行轨道。
The sun will swell into a red giant .
太阳将膨胀为一颗红巨星。
The sun will swell into a red giant.
太阳将膨胀为一颗红巨星。
As a result, the core will shrink and the outer layers will rapidly expand as the Sun transforms itself into a red giant.
最终随着太阳变成一个巨型火球，内核将会收缩，外层将会快速膨胀。
Our Sun is between the lightweight and heavyweight stars. The red giant star at the bottom of the graphic is much larger than the other stars in the illustration.
在插图下方的红巨星看起来比其他的恒星都要大，但是它的质量却只有太阳的十几分之一到几分之一。
Billions of years ago Mira was likely similar to our Sun, but has now become a swollen red giant star, its outer layers of material blowing off into interstellar space.
数十亿年前，苎藁增二是一颗类似我们太阳的恒星，但现在变成了一颗肿胀的红巨星，它外层的物质被吹到星际太空中。
And about 5.4 billion years, the sun will become the ultimate shredder. A red giant large enough to swallow earth's whole.
大约在54亿年之后太阳会成为终极粉碎机，它会变成一个红巨星大小足以吞噬整个地球。
Around 7.5 billion years, the expanding sun, now a red giant, will engulf the earth entirely, Sounds bleak, so can we avoid this hot mass?
75亿年后不断膨胀的太阳已成红巨星，并将完全吞噬地球。听起来很吓人那我们能躲过这团热球吗？
Around 7.5 billion years, the expanding sun, now a red giant, will engulf the earth entirely, Sounds bleak, so can we avoid this hot mass?
75亿年后不断膨胀的太阳已成红巨星，并将完全吞噬地球。听起来很吓人那我们能躲过这团热球吗？
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