Scary theory about aliens (pt 2)

First, we need to accept that the Eukaryote Miracle is the biggest filer, filtering out multi-cellular life forms. When applied to the Drake equation, we end up with between 40 and 70 intelligent species in our galaxy. The galaxy is incredibly BIG. Humans haven't been around for very long. If we did receive a signal, it would likely be 10,000 years old. And that's the fundamental problem we face, the sheer SCALE of our galaxy makes detecting aliens a virtual impossibility. In truth, finding a needle in a haystack would be easier.