Drake equation

Etymology
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Proper noun

 * 1)  A formula for calculating the probability of civilizations existing elsewhere in the Milky Way galaxy and of their ability to communicate with Earth.

Translations

 * Finnish: Draken yhtälö
 * French: équation de Drake
 * Japanese: ドレイクの方程式
 * Portuguese: equação de Drake
 * Russian: уравне́ние Дре́йка