The white ball in the middle of this picture may look familiar, but it shouldn't.
Although it looks a little like the moon you see in the sky almost every night, you have probably never seen this moon before.
This moon has a name: Dione. Instead of orbiting the Earth, this moon orbits Saturn. Do you remember where Saturn is?
It is the sixth planet from the sun. There are two planets between Earth and Saturn.
Saturn is famous for the big rings that circle the planet. You can see them in this picture, just below the moon. The rings are mostly made up of ice and rock.
The words of the day
to orbit
繞...的軌道運行
(rao4 ... de5 gui3 dao4 yun4 xing2)
The Earth orbits the sun. It takes one year to go all the way around.
地球繞著太陽運行一週，要花一年的時間。
planet
行星 (xing2 xing1)
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