According to the discoveries of the astronomers, when did galaxies form? [br] Ac

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问题 According to the discoveries of the astronomers, when did galaxies form? [br] According to the passage, the "hierarchical" theory of galaxy formation suggests that big, bright galaxies formed as ______.

选项

答案 smaller galaxies collided and merged

解析根据题干中的关键词“hierarchical”theory定位到最后一段，可得答案。

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