Prof. Jonathan Lunine explains how planetary science unifies the search for life beyond Earth by integrating astronomy, geology, chemistry, and atmospheric science to investigate habitable environments on Mars, Europa, Enceladus, Titan, and exoplanets.This lecture was given on July 18th, 2025, at Dominican House of Studies.For more information on upcoming events, visit us at thomisticinstitute.org/upcoming-events.About the Speakers: Jonathan Lunine is the Chief Scientist at NASA’s Jet Propulsion Laboratory and Professor of Planetary Science at Caltech in Pasadena, California. Beforehand, he was the David C. Duncan Professor in the Physical Sciences and Chair of the Department of Astronomy at Cornell University. Lunine is interested in how planets form and evolve, what processes maintain and establish habitability, and what kinds of exotic environments (methane lakes, etc.) might host a kind of chemistry sophisticated enough to be called "life". He pursues these interests through theoretical modeling and participation in spacecraft missions. He is co-investigator on the Juno mission now in orbit at Jupiter, using data from several instruments on the spacecraft, and on the MISE and gravity science teams for the Europa Clipper mission. He was on the Science Working Group for the James Webb Space Telescope, focusing on characterization of extrasolar planets and Kuiper Belt objects. Lunine has contributed to concept studies for a wide range of planetary and exoplanetary missions. Lunine is a member of the National Academy of Sciences and has participated in or chaired a number of advisory and strategic planning committees for the Academy and for NASA.Keywords: Astrobiology, Biosignatures, Enceladus, Europa, Exoplanets, Habitability, James Webb Space Telescope, Mars Exploration, Planetary Science, Titan

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