... 本地星系群 Local Group 矮卫星星系群 dwarf satellite galaxies 致密星系群 compact group of galaxies ...
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希克森致密星系群31的合成图显示了4个相互混合的星系。
The composite image of Hickson Compact Group 31 shows the four galaxies mixing it up.
在中间上部是NGC 7319和被称为斯蒂芬五重星系的致密星系群。
At top center is NGC 7319 and the compact galaxy group known as Stephan's Quintet.
但是这些星系，也就是希克森致密星系群31的成员，距离我们相对较近，只有1.66亿光年。
But these galaxies, members of Hickson Compact Group 31, are relatively nearby, only 166 million light-years away.
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