http://www.pbs.org/wgbh/nova/origins/drake.htmlUsing this, how many civilization did you get? I would like to see how many you get using this equation. It's an interactive that calculates it for you.
So, how many civilizations are there in the Milky Way?
WHAT PEOPLE SAID...
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Deoxy99: 10,000 civilizations
DRAKE: 10,000 civilizations
Bla: 5,500 civilizations
NeutronStar: 1,750 civilizations