proving that they are indeed type Ia;

其次，证明发现的确实是Ia型超新星；

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Astronomers know that each Type Ia explosion has about the same brightness.

天文学家知道每种类型的Ia超新星的爆炸亮度相差无几。

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Astronomers know that each Type Ia explosion has about the same brightness.

天文学家知道每种类型的Ia超新星的爆炸亮度相差无几。

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