慢速英语:Is There a Ninth Planet in Our Solar System?

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短语讲解：

1. They want to find out more about “Planet Nine’s” orbit, and its impact on the outer part of our solar system.

find out 发现; 使发作
例句：I'll find out the address,and ring you back.
我找到地址后再与你通电话。

2. They say that this new planet is so large that there should be no doubt that it is a true planet, once they confirm it.

no doubt 固然; 无疑地; 很可能
例句：I have no doubt of their being happy together.
我不怀疑他们在一起的快乐。

3. At the moment it’s simply a prediction.

at the moment 当时; 此刻，现在
例句：Our chief concern at the moment is the weather.
眼前我们最关心的事是天候。