Gas giant Gas giant A gas giant is a giant planet composed mainly of hydrogen and helium. Gas giants are sometimes known as failed stars because they contain the same basic elements as a star. 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
The Planets five then-known dwarf planets, Eris, Pluto, Haumea, Makemake, and Ceres. Unlike Matthews' composition, this work is not intended to be incorporated into a performance of Holst's suite. In 2006, the Berlin Philharmonic, with Sir Simon Rattle and EMI Classics, commissioned four composers (Kaija Saariaho, Matthias Pintscher, Mark-Anthony Turnage, and Brett Dean) and recorded an additional, four-movement suite based on asteroids in the Solar System. The four movements were: Holst adapted the melody of the central section of "Jupiter" in 1921 to fit the metre of a poem beginning "I Vow to Thee, My Country". As a hymn tune it has