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The speculations about the existence of life elsewhere in the universe are centuries old. Thinkers and scientists from Giordano Bruno to Steven Hawking have argued that universe teeming with life would make more mathematical sense than if we were alone, but will we ever find evidence? This book examines the various theories on the subject, as well as hypothetical types of biochemistry, exosolar planets and the Search for Extra Terrestrial Intelligence program to give an insight of what or who could be waiting for us out there.

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