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120光年外的“生命信号”:科学家为何对K2-18b如此期待?
科学家形容:这是“迄今最强烈的系外生命迹象”,未来一两年进一步的观测尤为重要。如果K2-18b上检测到的二甲基硫醚等分子最终被证实来源于生命活动,那么其意义将是革命性的。这将意味着人类在茫茫宇宙中第一次找到了地球以外生命存在的有力证据,K2-18b也将成为首个生命存在的系外世界。
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