Barren

Barren planets are rocky, ore-rich planets that are often very difficult to traverse and inhabit. They are rewarding to explore due to their abundance of ore, but require more advanced life support systems if you plan to explore the outside of your spaceship. Making a base on a Barren planet is ill-advised due to their value and their difficulty to successfully inhabit. Barren planets are the only planets that have Beryllium, making them useful for making warheads.