This doesn't look like much, and that's because the population on Mars is just 15! It's a group of people that decided to jump off Steve's high-speed spaceship. They built a complex that is made primarily of glass, but a hint of wood is also used. They don't have much, because they have everything they need outside! Since there's no air, they fixed that by adding a sealed-tight door and special air suits. Eventually, their civilization will become one of the most advanced in the entire universe.