银河系内出现的超新星。
每十年至少有一颗超新星在我们的银河系中出现。
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 in the Milky Way are the likeliest source for most of the cosmic rays reaching Earth.
确实，Cheng预计银河中心激震前沿的能量将近是超新星爆发产生的能量的一百倍。
Indeed, Cheng expects that the energy of the shock front at the galactic centre is nearly 100 times greater than that created by a supernova explosion.
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