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The possibility that alien life exists in the universe is among the most profound of human conjectures, which today is being investigated not just by science-fiction writers but by scientists. Astrobiology presents an expert guide to this compelling field of science. It shows how the tell-tale signatures of life on Earth might hold the key to detecting life beyond our planet; explores the many planets beyond our Solar System discovered by NASA's Kepler and TESS missions; and explains alien- hunting touchstones such as Fermi's Paradox, the Drake Equation, and the 'Wow' signal. As NASA's rovers burrow into Mars and its probes peer ever further into the cosmos, this illustrated edition combines deep space images with infographics to cast a scientific eye over the most significant of scientific treasure hunts.