Planet 9's orbit is strange, and planet 9 is the farthest planet from the sun, and it's the planet is behind on neptune, but it's far. and planet 9 is dark and it's the coldest planet, it's more colder than neptune. planet 9 is named planet nine, planet 9 or planet X. this planet is hypothetical in the outer region of the solar system. and it's quiet larger than earth but neptune is larger than planet 9.
credits to all.
