The film tells about various hypotheses of the origin of the Moon as a celestial body. The film includes filming: landscapes of the rising and setting moon. Letters from the archive of K.E. Tsiolkovsky. Residents of the city of Moscow observe a total lunar eclipse in the courtyard of a residential building. Scientists are studying the alignment of the lunar and solar disks through telescopes. Drawings depicting various hypotheses of the appearance of the moon. Stills from TV reports about the landing of a man on the Moon, films and photographs of Soviet and American space exploration of the Moon.