Why do astronauts have to wear protective suits when they are on the surface of moon?

Explanation

In space, there is no pressure, if we do wear a pressured suit, our body will die. In space, we have to wear a pressurised suit, otherwise our body will continue to push out and blow up like a balloon. It would look cool, but we will be dead. So the astronauts in space must wear a pressurised suit.