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Chergovy cycle of development of the Earth's civilisation. Humankind is not ideal, but it is driven by the thirst for knowledge of the world. Scientists are looking for answers to a simple question – are we ourselves not only in the Sonia system, but also on our home planet? If so, earthlings dream of interzoriani perelioti, but they need a reliable and powerful engine. In a coincidence Sol, a student, meets the renowned scientist Professor Aysatar, and as part of his research group she helps to destroy the development of the engine. But the share – thing chimerna, because already for a year Sol together with his comrades virushayet u zorianu ekspeditsiya. But not everything is so simple, as it may seem at first glance. Will the expedition be successful, or will the conservative forces celebrate the victory?