Ned's son was observing galactic clusters with a telescope.

内德的儿子当时正在用望远镜观看银河星团。

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The ring may have been formed when two galactic clusters collided.

这个‘指环’可能是在两个星团发生碰撞时形成的。

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Last year, astronomers took a major step to chart dark matter, with a map of the substance around individual galaxies and galactic clusters.

去年，天文学家开始着手为暗物质绘图，地图上包括个体星系和银河系群星周围的物质。

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The rate at which galactic clusters form depends, in part, on the amount of dark energy around at the time.

ECONOMIST: Cosmology

Such black holes ranging in size from 1, 000 to 10, 000 times the mass of the sun should sit inside globular clusters like scaled-down versions of galactic black holes at least in theory.

MSN: Existence of middleweight black holes nearly ruled out