Neptune is similar in composeetion tae Uranus, an baith hae composeetions which differ frae those o the lairger gas giants, Jupiter, an Saturn. Neptune's atmosphere, while similar tae Jupiter's an Saturn's in that it is componed primarily o hydrogen an helium, alang wi traces o hydrocarbons an possibly nitrogen, contains a heicher proportion o ""ices"" such as watter, ammonia, an methane. Astronomers sometimes categorise Uranus an Neptune as ""ice giants"" in order tae emphasise these distinctions. The interior o Neptune, lik that o Uranus, is primarily componed o ices an rock. It is possible that the cor has a solit surface, but the temperatur would be thoosands o degrees an the atmospheric pressur crushin. Traces o methane in the ootermaist regions in pairt accoont for the planet's blue appearance.