以下为句子列表：
英文: A spectral analysis also shows that the supernovae used to measure the universe's expansion rate today look remarkably similar to those that exploded nine billion years ago and are just now seen by Hubble.
中文: 光谱分析同样显示现今用来测量宇宙膨胀率的超新星与那些90亿年前爆炸的也就是现在被哈勃看到的超新星非常的相似。
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英文: Finding such ancient and far-off supernovae is difficult, however.
中文: 然而，想发掘如此古老而又遥远的超新星可不简单。
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英文: Observations from the Chandra X-ray telescope helped show that it didn't become a black hole like other supernovae and skipped a stage of star death.
中文: 通过钱德拉X射线望远镜观察发现，它并不像其他超新星（爆炸以后）变成黑洞，它跳过了恒星死亡的一个阶段。
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英文: Pinpointing supernovae in the faraway universe is similar to watching fireflies in your back yard.
中文: 在遥远的宇宙中精确定位超新星就像在你的后院中观察萤火虫。
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英文: Pulsars and Supernovae are shown on the sky because scientists believe they emit gravitational waves.
中文: 天球上标识出了脉冲星和和超新星遗迹，因为科学家们相信它们都会发射出引力波。
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