这篇文章的作者认为，探测到外星文明的电波的几率可以计算。

Although it might not be self-evident, it is in fact entirely possible to calculate the probability of detecting alien radio signals by understanding what types of extraterrestrial radio emissions can be expected and what properties these emissions can have. Using the Drake equation as the obvious starting point, and logically identifying and enumerating constraints of interstellar radio communications can yield the probability of detecting a genuine alien radio signal.

谁能解释为啥外星文明也一定会使用电波呢？它们可能和我们地球上的生命形式完全不一样呢。