Drake Equation

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Description
Star: average rate of star formation in our galaxy.

Star with two planets: fraction of those stars that have planets.

Three planets: average number of planets that can potentially support life per star that has planets.

Cell: fraction of planets that could support life that develop life at some point.

Gear: fraction of planets with life that develop intelligent life.

Radio signal: fraction of civilizations that develop a technology that send detectable signs of their existence into space.

Clock: length of time civilizations broadcast detectable signals into space.
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