A comet is at aphelion when it is farthest from the sun.

彗星离太阳最远时就是在它的远日点上。

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That's because, at our farthest from the sun, like now, Earth is traveling most slowly in its orbit.

这是因为，像现在离太阳最远，地球在它的轨道运行最慢。

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But even with more than a century and a half of observations, many unresolved questions remain about the farthest planet from the sun.

不过，即使经过了一个半世纪的观测，这个距离太阳最远的行星，仍有许多尚未解决的问题。

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