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。
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。
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。
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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