Aliens, Gods and Human Civilizations

Ancient humans created many incredible things that could not have been possible with their not-so-advance technology. These amazing structures and things make us believe that gods might have helped humans to build them. Who are gods? Where did they come from? These questions are answered by different religions. All religions state that gods came from heaven, but a question Where is heaven and is it a planet? arises from this statement.This book tries to answer this question with evidence of aliens in different civilization, close encounters of aliens with humans and alien technology.