银河系中最少有500亿的外行星，这个天文学估算听起来怎么样？
How's this for an astronomical estimate? There are at least 50 billion exoplanets in our galaxy.
如果这种想法正确，我们银河系中心的轰隆声将给天文学家一个新的方式去检验那里的情况。
If this kind of thinking is correct, the rumblings at the centre of our galaxy will give astronomers a new way to examine conditions there.
其中的一个光环------那个大的环围绕着银河系的中心------可能是最近与另外一个银河系碰撞中形成的，天文学家们说。
One of the rings, a large one encircling the galactic center, may have formed during a recent collision with another galaxy, astronomers say.
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