Solar System Facts - 2

The four outer planets, also known as the “gas giants”, are substantially larger and more massive than the inner planets.
The two innermost gas giants, Jupiter and Saturn, are the largest of the four outer planets and are composed mainly of hydrogen and helium.
The two outermost gas giants, Uranus and Neptune, are composed largely of ices (water, ammonia and methane). Together they are referred to as the “ice giants“.