Searching for extraterrestrial life

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The Search for Extraterrestrial Life by Wade Roche... Are we alone in the universe? If not, where are the others? Is there life, intelligent or otherwise, on other planets? Everything we know about how planets form and how life originated suggests that human civilization on Earth is not unique; we should, therefore, be seeing ample evidence of extraterrestrial activity, but we have found nothing yet. This book covers the long history of extraterrestrial speculation, the emergence of the search for extraterrestrial intelligence as a scientific discipline, the use of radio and optical techniques by scientists to search for extraterrestrial signals, and the development of astrobiology and the search for exoplanets.