Why Haven't We Seen Aliens?

Om boken

If there really is alien life elsewhere in the Universe, then it's reasonable to ask why we haven't seen it. Surely planet Earth must have been visited by aliens, if they exist. Does that mean that alien life doesn't exist? This book uses our knowledge of the universe, some simple maths and a little bit of intelligent speculation to take a sober look at the chances of our actually meeting alien life. After all, we will only meet up if both of us are in the right place at the right time. The Univ...Vis mer