There are two known ice giants in the Solar System, Uranus and Neptune, although there has been recent substantial evidence of a third ice giant, tentatively nicknamed "Planet Nine", as it would be the solar system's ninth major planet.
There are two known ice giants in the Solar System, Uranus and Neptune. There has been recent substantial evidence of a third ice giant. It would be the solar system's ninth major planet. There has tentatively nicknamed "Planet Nine". It would be the solar system's ninth major planet.