Heavy elements, like uranium, can only be created in a catastrophic cosmic explosion.

象铀一样的重元素只能在灾难性的宇宙爆炸中产生。

This releases energy, and creates heavier elements.

这会释放出能量，并产生更重的元素。

There are practically no heavy elements and metals.

几乎没有重金属元素。

There's some helium and traces of heavier elements.

太阳中含有氦和少量较重的元素。

The heavy elements spread out and mixed with the outer layers of Jupiter.

重元素向外扩散并与木星的外层混合。

Observations of the targeted galaxy suggested it contained gas filled with heavy elements.

对目标星系的观测表明，它含有充满重元素的气体。

But across the universe, there are vanishingly small amounts of those heavy elements.

茫茫宇宙之中这些重元素的含量简直少到不能再少。

That technique for creating a new heavy element is inspired. Oh, well, thank you.

你的理论对合成新超重元素有着重大的意义。哦，谢谢。

The star shoots most of its innards into space, seeding the galaxy with heavy elements.

这颗恒星把它大部分的“内脏”射入太空，在星系中植入重元素。

Iron refuses to fuse any further, so the star is now jam-packed with heavy elements.

铁原子不会进一步聚变，所以这颗恒星现在充满了重金属元素。

Massive stars explode and scatter their heavy elements into the Universe, and that takes time.

大质量恒星爆炸并将重元素散布到宇宙中，这需要时间。

Only they can reach the extreme temperatures needed to create large amounts of the heavy elements.

只有这种恒星才能达到制造重元素所需的温度，大量生成重元素。

I mentioned that uranium is the heaviest element in the periodic table, but which is the lightest?

我提到过铀是元素周期表中最重的元素，但哪个元素是最轻的呢？

This leads to the creation of heavier elements up to iron.

这导致了较重元素的产生，一直到铁。

Supernova explosions are also predicted to be responsible for producing heavy elements such as gold, platinum and uranium.

据预测，超新星爆炸也会产生诸如金、铂和铀等重元素。

These conditions last for just 15 seconds, but it's enough to form the heaviest elements like gold.

这种情况只能持续大约 15 秒，但是已经足够产生一些重质基本元素了，比如说金元素。

The resulting supernova creates even more heavy elements, scattering them through space.

由此产生的超新星产生了更多的重元素，将它们散射到太空中。

Today you learned that massive stars fuse heavier elements in their cores than lower mass stars.

今天你学到了高质量恒星比低质量恒星在核心中融合更重的元素。

The stars in globular clusters tend to have less heavy elements in them too, which you expect if they're old.

球状星团中的恒星往往也含有较少的重元素，如果它们很老的话，这也是你所期望的。

It took billions of years for stars like the Sun to form, the ones with more heavy elements in them.

像太阳这样的重元素较多的恒星需要数十亿年的时间才能形成。