"Are the Planets Inhabited?" by E. Walter Maunder is a compelling exploration into the possibility of extraterrestrial life beyond Earth. Maunder, a respected astronomer, delves into this age-old question, combining scientific inquiry with imaginative speculation. Through meticulous examination of astronomical observations and advancements in the understanding of celestial bodies, the book scrutinizes the conditions necessary for life and contemplates the potential habitability of planets within our solar system and beyond. Maunder's work navigates the intersection of astronomy, biology, and the limits of human knowledge, inviting readers to ponder the existence of life beyond our home planet. This intriguing inquiry, framed within the scientific context of its time, offers both an informative and speculative perspective on the age-old question of whether the planets in our universe might host extraterrestrial inhabitants.