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?
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?
the Galaxy consists of 100 billion stars.银河系由1千亿颗恒星组成。
From this you can calculate the total mass in the Galaxy.据此,你可以计算出银河系的总质量。
"the Galaxy has an inner clutch of rocky, sort of terrestrial-like planets," Butler says.巴特勒说:“这个星系内部有一堆岩石,有点像类地行星。”