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Our solar system, the place we call home
太阳系，我们的家园
lies about 26,000 light years from the center of our galaxy, the Milky Way.
位于距离银河系中心二万六千光年的地方
or around two thirds the way out.
或说是银河系直径的三分之二处
The story of how these huge planets came to be orbiting
这些巨大行星用了六百万年才开始
an average yellow star is six billion years long,
环绕一颗中等大小的金色恒星运行
and since we don't have that much time, I'll speed it up a bit.
由于时间有限，我会加快速度解释过程
It starts with a bang.
故事的开头是一个大爆炸
Long ago an ancient star exploded,
很久以前，一颗古老的恒星发生爆炸
littering space with swirling clouds of the materials it had made while it lived
向空中抛出旋转的它燃烧时产生的物质云团
and the heavier metals it created as it died.
和灭亡时产生的更重的金属
We know this because we
我们之所以知道这些是因为
can see similar feels of dust out in space today.
现今能从星际尘埃中看到相似的感觉
They are called nebulae and they are very beautiful.
它们叫作星云，形态绚丽多彩
Every nebula is different,
每个星云都不同
and in our case the clouds contained nitrogen and oxygen and iron and silicon
我们的星云包含氮，氧，铁，硅
and all the other stuff needed to build a world like ours.
和其他构成丰富多彩的世界所需的东西
Then the tireless force of
接着，不知疲倦的万有引力开始
gravity started to pull it all back together.
将一切牵引到一起
And the heavy engineering that produces planets began.
创造行星的浩大工程开始了
Vast spirals of dust began to form
大量尘埃飞扬，开始排列
and at the center of one of these,
某片尘埃中央
a rocky planet called Earth started to take shape,
一颗称为地球的岩状行星开始成形
built of stardust and assembled by gravity.
由星尘为材料，由万有引力组建而成
