Video forbidden, man has already gone to Mars

It was shared on YouTube and on Reddit. It's something that has already been around for some time. The material is announced as property of NASA, from the RedSun Project space mission, from 1973.

In the clip you see the planet Earth from afar, go to the moon and you can see it near Martian terrain. In a moment you see a board that indicates that the mission takes 158 days.