Final answer:
The Drake Equation does not include the parameter 'Fraction of planets with a moon and magnetic field.' It comprises several factors to estimate communicating extraterrestrial civilizations, such as the fraction of stars with planets, habitable planets, and planets where intelligence develops.
Step-by-step explanation:
The parameter of the Drake Equation that is not included is: b. Fraction of planets with a moon and magnetic field. The Drake Equation is used to estimate the number of communicating extraterrestrial civilizations in the Milky Way galaxy. This equation includes the following parameters:
- fp = the fraction of stars with planets
- ne = the fraction of those planets that are in the habitable zone
- fl = the fraction of habitable zone planets where life actually arises
- fi = the fraction of planets with life where intelligence develops
- fc = the fraction of civilizations that develop a technology that releases detectable signs of their existence into space
- L = the length of time such civilizations release detectable signals into space
Each parameter represents a factor that affects the likelihood of encountering intelligent life capable of communication in our galaxy. While we can make educated guesses, many values in the Drake Equation remain speculative due to the lack of empirical evidence outside of our own planet.