Drake's equation
Here's a form at MSNBC for inputting your guesses about the various parameters and calculating the result.
This is a more formal article defining each of the terms.
Space/Science » in reply to ETI, and the formula
Space/Science » in reply to ETI, and the formula
Here's a form at MSNBC for inputting your guesses about the various parameters and calculating the result.
This is a more formal article defining each of the terms.