And so this slide here illustrates a concept known as stellar parallax.
这张投影片展示出 恒星视差的概念。
They measured the star's proper motion and calculated its stellar parallax.
他们测量了该恒星的自行并计算了其视差。
The stellar parallax therefore, is very small and actually very hard to detect.
因此，恒星视差非常小，很难侦测到的。
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