Uranus' atmospheric composition by volume is 82.5% hydrogen, 15.2% helium and 2.3% methane. Its internal structure is made up of a mantle of water, ammonia and methane ices, as well as a core of iron and magnesium silicate. Neptune' Atmospheric composition by volume is 80% hydrogen, 19% helium, 1.5% methane ices,So where does that put Neptune & Uranus?
Good observation. If we examine the exoplanet sites, we may need *Super-duper* gas giants tooThe facts of the article are interesting but Saturn is still a gas giant due to the fact that it's a giant planet and it's mostly gas! I've noticed in the stories about newly discovered planets around other stars that there are also a lot of planets much larger than Jupiter. Maybe what we should really be talking about is a new category of "Super Gas Giants" rather than changing the classification we use for Solar System planets.
Good observation. If we examine the exoplanet sites, we may need *Super-duper* gas giants too