According to the discoveries of the astronomers, when did galaxies form? According to the passage, the "hierarchical" theory of

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问题 According to the discoveries of the astronomers, when did galaxies form?
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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