Saturn 's interior is probably composed of a core of iron , nickel and rock ( silicon and oxygen compounds ) , surrounded by a deep layer of metallic hydrogen , an intermediate layer of liquid hydrogen and liquid helium and an outer gaseous layer .
The inside of Saturn is probably a core of iron , nickel , silicon and oxygen compounds , surrounded by a deep layer of metallic hydrogen , then a layer of liquid hydrogen and liquid helium and finally , an outer gaseous layer .