线条的方向表示恒星运动的方向；
The direction of the line indicates the direction of the star's motion;
但地球相对于太阳运动，太阳相对于某些其他恒星运动，等等。
But the earth is in motion relative to the sun, the sun is in motion relative to some other star, and so on.
所以，你的意思是因为恒星运动么？为了铭刻于心我需要好好追随你的思路。
So, what do you mean by interstellar activity? Keeping in mind I need to follow what you are talking about.
吉布·哈特手中有地面观测的其他15个球状星团中恒星运动的数据资料，其中大部分的核心没有M 15那么稠密。
Gebhardt has data in hand from a ground-based survey of star motions in about 15 other Milky Way clusters, most of them easier to study than the crowded heart of M15.
吉布·哈特手中有地面观测的其他15个球状星团中恒星运动的数据资料，其中大部分的核心没有M 15那么稠密。
Gebhardt has data in hand from a ground-based survey of star motions in about 15 other Milky Way clusters, most of them easier to study than the crowded heart of M15.
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