NGC 470暗淡而巨大的弧圈或壳可能是与比邻星系NGC 470之间的引力碰撞形成的。
The faint, wide arcs or shells of NGC 474 could have been formed by a gravitational encounter with neighbor NGC 470.
这个壳层的存在表明在过去不久发生过星系之间的大碰撞。
The shells' presence indicates a Titanic clash with another galaxy in the relatively recent past.
另一种说法是，壳状结构如同是池塘中的波纹，是NGC 474与位在其上的螺旋星系正在进行的碰撞所产生的密度波搅动而激起的。
Alternatively the shells may be like ripples in a pond, where the ongoing collision with the spiral galaxy just above NGC 474 is causing density waves to ripple though the galactic giant.
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