In this classic work, Dutch mathematician and astronomer Christiaan Huygens presents a compelling argument for the idea that planets other than our own may be inhabited. He uses astronomical observation and mathematical reasoning to refute common objections and establish the plausibility of life on other worlds. This book is a must-read for anyone interested in the history of astronomy or the search for extraterrestrial life. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.