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宇宙中可能存在外星生命的行星或许比预计的还要少
source link: https://tech.sina.com.cn/d/s/2019-07-16/doc-ihytcitm2278922.shtml
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新浪科技讯北京时间7月16日消息，据国外媒体报道，一项新研究大大减少了可能存在外星人的行星数量。过去，科学家会根据行星到其围绕的恒星之间的距离划定“宜居带”。如果某颗行星（比如地球）到恒星的距离刚刚好，表面允许液态水存在，就会被视为“宜居星
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