Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...

Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...

SETI 研究人员调查了地球对外星文明的可探测程度，发现我们最明显的技术信号是无线电辐射和大气污染物。 如果从附近的太空观测，激光、卫星和城市灯光也会发出我们存在的信号。 这项研究为地球的能见度提供了一个新的视角，有助于完善SETI的搜索策略。