[Nyx]

If the planet's atmosphere is the same as your race breathes you can build outdoors and this means that you can build 5 times as many facilities on the planet. You can also capture people from other races and put them on worlds that they like. For example, you have a race that breathes hydrogen. On non-hydrogen worlds you can have

Tiny: 1, Small : 2, Medium: 3, Large: 4, and Huge: 5 facilities. On hydrogen worlds, you can have 5, 10, 15, 20, or 25 facilities respectively. If you later capture some people who breathe methane and put them on a medium methane world, they will be able to build 15 facilities there while your people could only build 3.