N = R_{*} ×
F_{p} ×
N_{e} ×
F_{l} ×
F_{i} ×
F_{c} ×
L

Estimate the number of detectable alien civilizations in the Milky Way using the Drake Equation.

- to think about the size and composition of the galaxy and how it affects the possibility of intelligent life
- to understand and estimate the terms of the Drake Equation
- to compare your initial guess with the final value