The figure shown the planetary system of Fomalhaut as illustrated by space artist.
图中是画家笔下北落师门的行星系统。
extrasolar planetary system.
其他行星系
Travel to the planetary systems of other stars is a much more formidable undertaking.
要航行到其他恒星的行星系中去是件极难实现的事。
Within our own galaxy there are probably tens of thousands of planetary systems.
在我们自己的星系里可能有数以万计的行星系。
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