
银河系里几千亿颗恒星,按概率,适合生命的地方应该不少。这期咱们用德雷克方程算算"宇宙里可能有几个文明",再用费米悖论泼盆冷水——"他们都在哪呢?"聊宜居带是怎么回事,聊2025年韦伯望远镜在系外行星大气里疑似看到了生物活动才可能产生的气体信号(注意,是疑似,不是确认)。人类找了几十年外星人,宇宙却静得能听见自己心跳。几千亿颗恒星、几千颗宜居行星,难道就咱地球一棵独苗?还是说,他们也在某个角落,悄悄找着我们?
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