# How do you derive Drake's Equation? #N=R*f_p*n_e*f_1*f_i*f_c*L#

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Also, how do you calculate the factors?

Also, how do you calculate the factors?

##### 1 Answer

#### Answer

#### Answer:

#### Explanation

#### Explanation:

#### Answer:

Around 10,000 to 100,000,000 civilizations in the Milky Way Galaxy

#### Explanation:

All of these values vary **greatly**, optimistic estimates is about 100,000,000 civilizations, more pessimistic estimates give us around 1,000. But a more general estimate is about 100,000.

Edit: Drake came up with the equation by considering the factors that are required in order to detect extraterrestrial life.

"As I planned the meeting, I realized a few day[s] ahead of time we needed an agenda. And so I wrote down all the things you needed to know to predict how hard it's going to be to detect extraterrestrial life. And looking at them it became pretty evident that if you multiplied all these together, you got a number, N, which is the number of detectable civilizations in our galaxy. This was aimed at the radio search, and not to search for primordial or primitive life forms." —Frank Drake.

Source: Wikipedia, the Drake Equation

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