短语讲解：

1. The approach was the closest the spacecraft will get to the planet before crashing into it at the end of its mission in 2018.

at the end of 在…结尾，在…末端
例句：He parted with us at the end of the trip.
旅行结束时他和我们分手了。

2. Jupiter and the three other outer planets are known as gas-giants because of their thick, gaseous atmosphere.

because of 因为，由于
例句：It is mainly because of my fault.
这主要是由于我的过错。

3. Scientists also hope to find out more about the great red spot.

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