1.  star cluster
2.  stardust

• 1. 星团: cluster | stardust | Praesepe
• 2. 猎户四边形星团: Trapezium Cluster
• 3. 球状星团: globular cluster | globular star clusters

更多释义

• 1.星系往往聚集形成星团。
  Galaxies tend to clump together in clusters.
  dict.yoduao.com
• 2.如果 NGC 4258 的中心是一个星团，恒星之间的距离会非常近，以至于在很久以前单个恒星之间的碰撞就会把星团撕裂。
  If the center of NGC 4258 were a star cluster, the stars would be so closely spaced that collisions between individual stars would have long ago torn the cluster apart.
  dict.yoduao.com
• 3.球状星团曾经统治着银河系。
  Globular clusters once ruled the Milky Way.
  dict.yoduao.com

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