neptune

Both are fundamentally distinctive from the larger gas giants Jupiter and Saturn, and from smaller rocky worlds like Earth. Uranus and Neptune have similar masses and internal compositions. Their outer atmospheres are composed of hydrogen, helium and methane, although their mantles are a combination of water, ammonia and methane ices, and their cores are a mix of rock and ice. Uranus is 31,800 miles in diameter at its equator, creating it the third biggest planet in the solar program . Comparable to Jupiter, Saturn, and Neptune, Uranus consists mostly of gas. These circumstances exist inside Uranus and Neptune and undoubtedly...