Other Civilizations in the Universe
I recently came across a very interesting paper in a nsa.gov portal (National Security Agency) that was entitled ‘ Communication with Extraterrestrial Intelligence .’ The very first line is ‘We are not alone in the universe’ which sets the tone for the article. The article goes on to say that even accounting for a five thousand percent margin of error there are probably 100 million stars in our own galaxy which have a planet in the habitable zone. If you then consider that there are probably a billion other galaxies in the universe the number of civilizations that could have arisen by now is probably closer to a billion. A billion other civilizations in the universe is certainly a huge number. I discuss similar information with a bit different data in my book Aliens Are With Us and also in my blog post regarding other intelligent life but it is always good to read other papers and articles that corroborate the same theory. The article goes on to discuss the challenges of