Key Message: Life in the Universe takes readers on a journey through the solar system and beyond, using a rigorous yet accessible introduction to astronomy, biology, chemistry, and geology to explain natural phenomena and explore unanswered scientific questions. The Second Edition has been thoroughly revised to include updated scientific discoveries, optional quantitative coverage, an enhanced illustration program, and expanded coverage of the solar system and stellar material. Key Topics: Introducing Life in the Universe: A Universe of Life?, The Science of Life in the Universe, The Universal Context of Life. Life on Earth: The Habitability of Earth, The Nature of Life on Earth, The Origin and Evolution of Life on Earth. Life in the Solar System: Searching for Life in Our Solar System, Mars, Life on Jovian Moons, The Nature and Evolution of Habitability. Life Among the Stars: Habitability Outside the Solar System, The Search for Extraterrestrial Intelligence, Interstellar Travel and the Fermi Paradox. Epilogue: Contact – Implications of the Search and Discovery Market: For all readers interested in a rigorous yet accessible introduction to astronomy, biology, chemistry, and geology, while exploring fundamental pan-scientific questions such as: How did life begin on Earth? What are the most extreme forms of life currently known? What are the challenges of trying to colonize another planet?