The expanding material, called the supernova remnant, forms fantastic shapes.

这个膨胀的物质被称为超新星遗迹，形成了奇异的形状。

Star clusters, supernova remnants, and a double star all make it worth it to take a closer look at Cassiopeia.

星团、超新星遗迹，还有双星，它们都值得你仔细地观察仙后座。

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。

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。