地球的力量 第5集 稀有行星(15):唯一的星球

Any closer to the Sun, like Venus,and it's far too hot.

离太阳再近些，像金星 那就太热了

Any water would boil away.Look at the green zone.

什么水都会蒸发掉 看那片绿色区域

This is the only place in the entire solar system that can support complex life,

这是整个太阳系中唯一一个 可以支持复杂生命生长的位置

and Earth is the only planet there.

地球是这里唯一的星球

But it's not just Earth's proximity to the Sun that's important.

重要的并不只是地球和太阳的位置

We're also lucky enough to orbit the right type of sun.

我们也很幸运围绕着正确的恒星旋转

This is the actual surface of the Sun.

这是太阳表面

Every second, four million tons of the Sun is converted into pure energy.

每一秒，太阳上的四百万吨物质 都会被转换成能量

It's been doing this for more than four and a half billion years.

它已经这样燃烧了45亿年了

And it's this long lifespan that makes our Sun so special.

就是因为这样长的时间让我们的太阳这么特别

Many other stars are bigger, but at a cost.

其它的恒星可能更大但是那是有代价的

The larger the star is, the quicker it burns up and dies.

恒星越大它燃烧的越快很快就会燃尽消亡

It took billions of years for complex life to get going on Earth,

复杂生命需要几十亿年在地球上进化

and it's our Sun's long life that made that possible.

因为我们的太阳寿命长才使复杂生命成为可能

And there's one final piece of good fortune that life on Earth depends on.Jupiter.

地球上的生命 还有最后一件幸运事 木星