On Saturday, December 30, 2017 at 12:53:03 PM UTC-6, Herbert Glazier wrote:
Same material,but have these different aspects.#1 meteor craters #2 roundness.#3 spin.#4 amount ofmoons.#5 length of orbits.#6 having H2O Trebert

Planet nine may have different materials if it turns out to be captured from deep space.