He wanted to estimate N, the number of communicative civilizations out there in our galaxy, and he included in there the rate of star formation, the rate of planets, but crucially, intelligence.
A vrut să estimeze N, numărul civilizaţiilor capabile de comunicaţie din galaxie. Şi a inclus acolo rata de formare a stelelor, rata planetelor, dar decisiv, inteligenţa.