Men Into Space

I was around 6 or 7 (like everyone else it seems). My clearest episode memory is one where they are all walking around on the moon, and one man notices some sort of sand streaming down off a large rock, so he walks over & cups his gloved hands under the stream. He immediately starts screaming in agony, but I don't remember why. Maybe it was super hot, or else some extremely corrosive substance.

In another episode, one member of the team is terrified because he swears he saw something moving while he was walking around on the moon. Eventually they all discover that he had seen his own reflection in a sheet of ice. This was their first discovery of ice on the moon, and they realise the implications.

This show significantly helped to define the exciting world I was lucky enough to be growing up into. Now the world has regressed thousands of years.