Are we alone in the Universe, or are there other life-forms ‘out there’? Recent discoveries of planets beyond the solar system (more than 4000 of them) suggest that the question is not ‘whether?’ but ‘where?’. This book enables general readers to understand current endeavours to answer this question and the related one of ‘what kind?’

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Wallace Arthur is an evolutionary biologist and science writer. He is Emeritus Professor of Zoology at the National University of Ireland, Galway. His most recent book is The Biological Universe: Life in the Milky Way and Beyond, published by Cambridge University Press in 2020.