这种奇怪的设置可能是由于盘状星系捕获了途径的星系中的物质，而被捕获的物质形成了这个旋转的环形所致。
The bizarre configuration could have been caused by the chance capture of material from a passing galaxy by the disk galaxy, with the captured debris strung out in a rotating ring.
成团的年轻蓝星围绕一个环形的轨迹旋转。
Clusters of young, blue stars trace a ring around a center that is rotating with the galaxy.
另一方面，地球卫星北极附近的巨大环形山埃特肯盆地(aitken basin)，在月亮历史上，可能非常大导致了剧烈的旋转，迈罗氏提到。
On the other hand, a huge crater near the South Pole of Earth's moon-the Aitken basin-may be large enough to have triggered a dramatic roll early in the moon's history, Melosh noted.
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