We are not alone in the universe - this is shown by Harvard professor Avi Loeb in this book. Avi Loeb is one of the most renowned astronomers of our time. And he is certain: We are not alone in space. The shape and characteristics of the unidentified flying object that shot through our inner solar system in October 2017 allowed for only one explanation: Oumuamua, as it was called, was alien technology developed by an extraterrestrial civilization on an exploratory mission. Here, Loeb recounts the first sighting of this interstellar visitor, substantiates the high probability of extraterrestrial life, and poses the question of what consequences this has for us: for science and religion, for the future of humanity and the planet Earth. His book is a journey to the limits of our imagination.