The Celestial Worlds Discovered: Or Conjectures Concerning The Inhabitants, Plants And Productions Of The Worlds In The Planets is a book written by Christiaan Huygens in 1722. The book explores the possibility of life on other planets and the potential inhabitants, plants and productions that may exist in those celestial worlds. Huygens uses his knowledge of astronomy and physics to make educated guesses about the conditions and environments of these...