drake equation Proving EBE outside of earth.
here is an equation created by Frank Drake that basically goes like this: N=R* x f(p) x n(e) x f(l) x f(i) x f(c) x L N = # of civilizations in our galaxy where communication might be possible R* = the average rate of star formation/year in our galaxy f(p) = the fraction of those stars that have planets n(e) = the average # of planets that can support life/star that has planets f(l) = fraction of n(e) that can actually go on to support life at some point f(i) = the fraction of f(l) that can develop intelligent life L = length of time it would take to release detectable signals into space The most recently accepted numbers for each of these are as follows: R*=7 f(p)=1/2 n(e)=2 f(l)=.33 f(i)=.01 f(c)=.01 L=10000 This would make N=2.31, which means that there are about 2-3 civilizations in a galaxy can communicate at any given time. This would also leave 200 more that aren't trying to communicate. And this is only within our galaxy, so it doesn't include ...