IS ANYBODY OUT THERE? In the 18th century the existence of extraterrestrial life went from debatable hypothesis to fundamental tenet of Enlightenment thought.

The article focuses on the historical debates during the 17th and 18th centuries regarding the "plurality of worlds," the idea that other planets beyond Earth might be inhabited. Influenced by emerging astronomical discoveries and philosophical analogies, thinkers like Jérôme Lalande and Bernard Le Bovier de Fontenelle argued that planets resembling Earth likely supported life, a view that became intertwined with Enlightenment culture and Newtonian cosmology. These discussions often incorporated religious perspectives, with British theologians reconciling the existence of multiple inhabited worlds with Christian doctrine, while others questioned the compatibility of extraterrestrial life with the role of Christ. Despite extensive speculation, no definitive evidence emerged, leaving the debate open and reflective of broader tensions between science, philosophy, and theology.