Aliens: Past, Present and Future covers the subject of extraterrestrial life from every angle, from the earliest speculations more than 400 years ago about the possibility of life on other worlds, to today's ongoing search for Earth 2.0. In between are lessons learned about how life originated on our own planet, as well as the story behind the vast cult that has grown up around "flying saucers" and strange visitors from other planets, including popular culture renditions of them. The book is organised into three Parts. Part 1 reviews humankind's changing thinking about extraterrestrial...