The book is dedicated to the most diverse secrets that surround the moon and have been exciting people for many centuries - from the secrets of astronomy, geology, medicine to the secrets of space research and UFOs. In the appendices to the book, K.E. Tsiolkovsky's science fiction work "On the Moon" is published, which still remains little known to readers. This book was written in a difficult time for astronautics, when its funding decreased to a minimum and when it was subjected to massive and sharp criticism - both the costs of space research are great, and the practical return is low, and in general it is not up to them now, they say, "not up to fat, I would live..."