They then explode, as supernovae.

然后，它们像超新星一样爆炸。

Smaller light echoes have been seen around supernovae.

规模较小的光回音可在超新星附近看见。

The arrows in the top row of images point to the supernovae.

上面一行图片中的箭头指出了超新星。

Now this path to supernovae will have to be investigated in more detail.

现在，这条产生超新星的途径必须要得到更加仔细的研究。

It comes from observations of supernovae and other very distant sources.

而是来自遥远的超新星和其他非常远的源。