特征
NGC 772的直径约20万光年,是银河系的两倍大小[1],其周围有若干个卫星星系——包括矮椭圆星系NGC 770——其施加于NGC 772潮汐力很可能导致了后者发展出了一条非常长的外螺旋臂。
参考资料
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