Time Is Short

People of Earth,

Now that this has happened, time is short. I can only assume that the inhabitants of the planet around Gliese 581 have left us unmolested up to this point is that as long as we did not know of their existence we were no threat. Now that the word is out, I can only assume that their long-prepared invasion fleet is under way. Fortunately, we have 20.5 years until word reaches them, and another 20.5 before their planet-killing machines can acheive Earth orbit, so we must use the 41 years of peace left to us to prepare. I am not a crank.