But if you could monitor the whole night sky, you'd see a type Ia supernova every few seconds.
但是如果我们监测全天，那么我们每几秒钟就可以看到一次Ia型超新星。
The chance of observing a type Ia supernova in any given galaxy is low. Only one or two are expected to pop off per galaxy per millennium.
在任一给定的星系中观测到Ia型超新星的机会是很小的，每个星系每千年预期只有一到两次。
The chance of observing a type Ia supernova in any given galaxy is low. Only one or two are expected to pop off per galaxy per millennium.
在任一给定的星系中观测到Ia型超新星的机会是很小的，每个星系每千年预期只有一到两次。
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