I just read the other comment. I myself watched it on East German TV in the seventies. Now it came out on DVD in Germany, with a German soundtrack provided by the former East German DEFA. I still hope for a new Russian Release with the original soundtrack and subtitles. Great nostalgic sci-fi movie. It certainly is no piece of propaganda of the old regime. You have young people with dreams as the spaceship crew. It is a very quiet movie, the heroes being adolescents sent on the long way to Cassiopeia. But something goes a bit wrong ... no I will not tell you more. At least if you know some German, you can now watch it. As I know the Russians, they will probably have it out again on DVD pretty soon.