Drake's equation gives the number of intelligent civilizations able to communicate within our own galaxy.
N=R*fs*fp*ne*fl*fi*fc*L
| STAR FORM RATE (stars/year) |
SUITABLE SUN FRACTION | PLANETARY FRACTION | SUITABLE PLANETS IN SYSTEM | LIFE FRACTION | INTELLIGENT FRACTION | RADIO FRACTION | TECH LIFETIME (years) |
|---|---|---|---|---|---|---|---|