Calculation Page

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The Drake Equation is:

**N*** represents the number of
stars in the Milky Way Galaxy.

**fp** is the fraction of stars that
have planets around them.

**ne**
is the number of planets per star that are capable of sustaining life.

**fl** is the fraction of planets in
**ne** where life evolves.

**fi** is the fraction of **fl**
where intelligent life evolves.

**fc** is the fraction of **fi**
that communicate.

**fL** is fraction of the planet's
life during which the communicating civilizations live.

Start replacing letters with numbers at **N*. **Multiply
each number by the one before it to get your answer.
Getting the correct answer depends upon multiplying each step correctly.

**Work Space**:

**When all of these variables are
multiplied together we come up with:
**

**N = the number of communicating civilizations in the galaxy**!