This article is intended to provide a review of some modifications to the Drake equation, a 1961 concept presented by Frank Drake to determine the number of extra-terrestrial civilizations able to communicate. A reduced version of the Drake equation will then be presented. This can be used to estimate an important question for astrobiology, the frequency with which planets are habitable. Finally, a concept is presented that can also integrate the habitability of moons into the reduced Drake equation.

中文翻译：

---

对宇宙中生命频率的类德雷克计算

本文旨在回顾对德雷克方程的一些修改，德雷克方程是 1961 年由弗兰克·德雷克提出的一个概念，用于确定能够进行交流的外星文明数量。然后将呈现德雷克方程的简化版本。这可用于估计天体生物学的一个重要问题，即行星宜居的频率。最后，提出了一个概念，该概念也可以将卫星的宜居性整合到简化的德雷克方程中。