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.

離太陽(yáng)再近些，像金星 那就太熱了

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

什么水都會(huì)蒸發(fā)掉 看那片綠色區(qū)域

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

這是整個(gè)太陽(yáng)系中唯一一個(gè) 可以支持復(fù)雜生命生長(zhǎng)的位置

and Earth is the only planet there.

地球是這里唯一的星球

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陽(yáng)的位置

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

我們也很幸運(yùn)圍繞著正確的恒星旋轉(zhuǎn)

This is the actual surface of the Sun.

這是太陽(yáng)表面

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

每一秒，太陽(yáng)上的四百萬(wàn)噸物質(zhì) 都會(huì)被轉(zhuǎn)換成能量

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

它已經(jīng)這樣燃燒了45億年了

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

就是因?yàn)檫@樣長(zhǎng)的時(shí)間讓我們的太陽(yáng)這么特別

Many other stars are bigger, but at a cost.

其它的恒星可能更大但是那是有代價(jià)的

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

恒星越大它燃燒的越快很快就會(huì)燃盡消亡

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

復(fù)雜生命需要幾十億年在地球上進(jìn)化

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

因?yàn)槲覀兊奶?yáng)壽命長(zhǎng)才使復(fù)雜生命成為可能

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

地球上的生命 還有最后一件幸運(yùn)事 木星