相互作用星系

但是我们只看到一团相互作用的星系，成为室女座星系团。

But we see mostly one large intervening cluster of galaxies , called the Virgo cluster .

哈勃的观测对这组相互作用四重星系的故事增加了新的重要线索，让天文学家确定星系遭遇开始的时间，并预言未来并合的情况。

The Hubble observations have added important clues to the story of this interacting foursome , allowing astronomers to determine when the encounter began and to predict a future merger .

它们是：1.盘状星系大尺度棒状不稳定性，2.死晕与活晕和盘状成份的相互作用，3.旋涡星系中球状成分的分布对旋涡结构的影响，4.互扰星系。

Four subjects are dealt with : 1 . the large-scale bar instability in disk galaxies , 2 . the interaction between the disk component and dead or live halo , 3 . the influence of spherical component in spiral galaxies upon spiral structure , 4 . interacting galaxies .