史帝芬韋柏: 外星人到哪兒去了？

外星人到哪兒去了？

宇宙非常古老，極度廣大，具有數兆個星球——所以，外星人在哪裡？天文學家史帝芬韋柏有一項解釋：我們在宇宙中是孤獨的。在這場能拓展思維的演說中，他詳細說明了一個星球若要有外星文明，會需要清除多麼大的障礙——並說明了我們可能的宇宙孤獨也是很美麗的理由。「宇宙的沉默正在吶喊：『我們是走運的生物。』」韋柏說。

Despite a universe filled with trillions of planets and billions of years of opportunity, no trace of extraterrestrial civilizations has emerged. Stringent barriers—like the right planet, stable climate, emergence of life, and advanced technology—make the odds of intelligent life vanishingly small. The idea that humanity may be alone is both humbling and empowering. The very absence of a signal suggests every moment of awareness is a cosmic stroke of luck.