14 Feb 2015
Where are the aliens?
For decades, people search for signals of extraterrestrial civilizations. The Milky Way as we know it so far, has up to 300 billion stars, probably millions of habitable planets, and it is more than 13 billion years old. Quite some facts these are. During this time there were plenty of chances for intelligent aliens to colonize the galaxy. Alone, so far humanity has not heard anything from them.