The book "Conversations about the plurality of worlds" by Fontenel M. de (Bernard Le Beauvier) is a philosophical publication, written in the form of a dialogue between a young man and a woman, which examines the concept of a plurality of worlds, or cosmos. The author relies on the teachings of Copernicus and Galileo to show that the Earth is not the center of the universe, but only one of the many planets that revolve around their stars. The book raises issues of space, astronomy, geography and philosophy, taking the reader on a fascinating journey through different worlds and possible forms of life. "Conversations about the multitude of worlds" is not only a popular science publication, but also an invitation to think about the place of man in the universe and the realities of space.