The most famous is the Crab nebula, from a star we saw blow up in the year 1054.

其中最著名的是蟹状星云，它来自于我们在1054年看到的恒星爆炸。

This is the Crab Nebula, the remains of that exploding star that the Chacoans saw in these skies a thousand years ago.

这是蟹状星云，它是由一千年前那场超新星爆发形成的。

There's a pulsar in the center of the Crab Nebula, the remains of a star that exploded to create that supernova remnant.

在蟹状星云的中心有一颗脉冲星，这是一颗恒星爆炸后产生的超新星遗迹。

The crab nebula is visible tonight.

今晚能看见蟹状星云。

The most famous of all of them is probably the supernova explosion that gave rise to the Crab Nebula.

其中最著名的可能是产生蟹状星云的超新星爆炸。

So studying supernova remnants, like the Crab Nebula, allowed astronomers to firmly conclude that the vast majority of oxygen on earth was produced by supernova explosions over the history of the universe.

因此，研究超新星遗迹， 如蟹状星云，让天文学家能够坚定地得出结论， 地球上的绝大多数氧气是由宇宙历史上的超新星爆炸产生的。