https://en.m.wikipedia.org/wiki/Planet_Nine#Size_and_composition https://en.m.wikipedia.org/wiki/Planet_Nine#Size_and_composi... https://en.m.wikipedia.org/wik

https://en.m.wikipedia.org/wiki/Planet_Nine#Size_and_composition https://en.m.wikipedia.org/wiki/Planet_Nine#Size_and_composi... https://en.m.wikipedia.org/wiki/Ice_giant https://en.m.wikipedia.org/wiki/Ice_giant More like a giant lump of ice and rock with a frozen atmosphere, a so-called “Ice Giant” like Neptune or Uranus.