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The unique shape of the Cartwheel Galaxy with its huge rim - larger than the diameter of the Milky Way galaxy - is likely due to a collision with one of the smaller galaxies on the lower left several hundred million years ago.
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释义
车轮星系独特的外观及庞大的外缘(比银河系的直径还要大)可能起源于几亿年前与左下某个小星系的碰撞。
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