If the center of NGC 4258 were a starcluster, the stars would be so closely spaced that collisions between individual stars would have long ago torn the cluster apart.
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。
2
The starcluster is embedded in a nebula, which spans some 110 light-years.
该星团嵌在一个约110光年大的星云内。
3
Can you find, in the above image, a comet, a spiral galaxy, an open starcluster, and a supernova remnant?