Conversations on the Plurality of Worlds

Conversations on the Plurality of Worlds (French: Entretiens sur la pluralité des mondes) is a popular science book by French author Bernard le Bovier de Fontenelle, published in 1686. It offered an explanation of the heliocentric model of the Universe, suggested by Nicolaus Copernicus in his 1543 work De revolutionibus orbium coelestium. The book is Fontenelle's most famous work and is considered to be one of the first major works of the Age of Enlightenment.

Unlike many scientific works of its time, Conversations on the Plurality of Worlds was written not in Latin, but in French and is notable as one of the first books to attempt an explanation of scientific theories in popular language. In the preface, Fontenelle addresses female readers and suggests that the offered explanation should be easily understood even by those without scientific knowledge. This move has been praised by some modern feminist critics as admitting women's intelligence in scientific matters. A precursor includes Giordano Bruno's De l'infinito, universo e mondi.

The book itself is presented as a series of conversations between a gallant philosopher and a marquise, who walk in the latter's garden at night and gaze at stars. The philosopher explains the heliocentric model and also muses on the possibility of extraterrestrial life. Fontenelle's work was not cast polemically against the world views of either the Catholic Church or the Protestant churches, nor did it attract the attention, positive or negative, of theologians or prelates.

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