Laymen here. 1. From my understanding the universe is like the surface of a balloon. The universe is expanding as a balloon grows when air in being placed inside of it. Just like a surface of a balloon if you go in any direction in a straight line you will come back to the original point. Is this description correct, if no please elaborate. 2. When we look at other galaxies we are looking at how they were in the past as light takes a long time to travel to us. This would mean that we are looking at what that galaxy was like when the surface of the balloon was smaller. We can't observe the entire surface of the balloon in its present form because by the time light reaches us the balloon is bigger. Is this description correct, if no please elaborate. 3. How thick is the surface of the balloon?