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This compact and often astonishing overview of the current state of astrobiology, by a director at the SETI Institute, explores the scientific advances of the past few decades, many of which have radically altered our understanding of the universe and, Cabrol argues, brought us close to finding extraterrestrial life. Space telescopes—most notably the Kepler, launched in 2009—have revealed a cosmos “populated by more planets than stars,” and infrared surveys of those planets’ atmospheres will yield vast amounts of data in the coming years. Cabrol, an assured and accessible guide, notes that interpreting that data poses a great challenge: because we still lack a consensus on the definition of life, we may not know it when we see it.
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