Isn't the optimistic guess at Drake 2 or something (correct me if I'm wrong)? That's not /very/ far from zero, and if you consider that it's the number in the M

Isn't the optimistic guess at Drake 2 or something (correct me if I'm wrong)? That's not /very/ far from zero, and if you consider that it's the number in the Milky Way I'd say that's pretty very much close to zero.