环状星系是外观上有环状结构的星系，环中包含了质量大、相对较年轻且极端明亮的蓝色恒星，中央区域则仅有少量且相对昏暗的物质。
但是，有时候这些光变得过于弯曲，在第一个星系周边形成环状。
That light can sometimes become so distorted that it actually appears to ring the nearer galaxy.
赛非星系能量巨大，因为在其中心有-一黑洞，黑洞周围则环绕着环状星云。
Seyfert galaxies are energetic because they have a central black hole surrounded by a ring of gas.
两个母星系间的碰撞产生里一个冲击波先将物质拉向中心然后使其向外传播形成环状。
The collision between the two parent galaxies produced a shockwave effect that first drew matter into the center and then caused it to propagate outwards in a ring.
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