<P> A gas giant is a giant planet composed mainly of hydrogen and helium . Jupiter and Saturn are the gas giants of the Solar System . The term `` gas giant '' was originally synonymous with `` giant planet '' , but in the 1990s it became known that Uranus and Neptune are really a distinct class of giant planet , being composed mainly of heavier volatile substances ( which are referred to as `` ices '' ) . For this reason , Uranus and Neptune are now often classified in the separate category of ice giants . </P>
<P> A gas giant is a giant planet composed mainly of hydrogen and helium . Jupiter and Saturn are the gas giants of the Solar System . The term `` gas giant '' was originally synonymous with `` giant planet '' , but in the 1990s it became known that Uranus and Neptune are really a distinct class of giant planet , being composed mainly of heavier volatile substances ( which are referred to as `` ices '' ) . For this reason , Uranus and Neptune are now often classified in the separate category of ice giants . </P>
what planet is the big blue gas planet
what planet is the big blue gas planet
Jupiter and Saturn
Jupiter and Saturn