"Conversations on the Plurality of Worlds" by Bernard le Bovier de Fontenelle is a popular science book published in 1686. Written in French rather than Latin, it presents complex astronomical theories through dialogues between a philosopher and an intelligent marquise as they stroll through gardens at night. The work explores the heliocentric model and speculates boldly on extraterrestrial life throughout the cosmos, making it one of the first major works of the Age of Enlightenment. (This is an automatically generated summary.)