N-COUNT A supernova is an exploding star. 超新星
At least one supernova occurs per decade in our galaxy.
每十年至少有一颗超新星在我们的银河系中出现。
Supernovas in the Milky Way are the likeliest source for most of the cosmic rays reaching Earth.
银河系中的超新星最有可能是大多数宇宙射线到达地球的来源。
Supernovas can briefly shine as brightly as an entire galaxy.
超新星能短暂地发出相当于整个星系亮度的光。
Supernovas are a class of violently exploding stars that become super bright after eruption.
超新星是一类剧烈爆炸的恒星，爆发之后它变得极为明亮。
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