探索宇宙，天文学家发现40光年外一颗类似地球这样的系外行星格利泽12b，银河系中究竟有多少潜在的宜居行星？
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探索宇宙，天文学家发现40光年外一颗类似地球这样的系外行星，银河系中究竟有多少潜在的宜居行星？
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