A lecture on the radio communication system of the spacecraft 'Vostok-1', the principles of its operation, precise engineering solutions, and the courage of scientific thought. Yuri Gagarin's flight is most often remembered as a great symbol of the era - with the famous smile and phrases known by everyone. But behind this event stood complex technology, without which the first human flight into space would have been impossible. The lecture offers a fascinating perspective on this historical moment - through the radio communication system of the 'Vostok-1' spacecraft and the engineering solutions that allowed the astronaut's voice to overcome the vast distance between orbit and Earth. Listeners will learn how the radio communication equipment was structured, the principles it operated on, and why technical reliability was one of the key conditions for the success of the flight. Behind the well-known phrase "Zarya-1, I am Cedar" lies not only human excitement and the historical significance of the moment but also a complex signal transmission system that required precision, calculation, and a high level of scientific thought. The lecture will be conducted by Alexander Korotkevich - Candidate of Physical and Mathematical Sciences and Professor at Skoltech. On our website, we share information about free events in Moscow.