你们有多少人见过银河,天上的银河系?
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。
Isn that strange that the Milky Way is the galaxy that the planet earth is in, and most of us have never seen it?银河系是地球所在的星系,而我们大多数人从未见过它,这不是很奇怪吗?