noun
In a narrower astronomical classification, refers specifically to Jupiter and Saturn, which are composed mainly of hydrogen and helium. Contrasted with 天王星型惑星 (ice giants).
See also: 天王星型惑星
木星型惑星には、木星と土星が分類される。
Jupiter and Saturn are classified as gas giants.
noun
giant planet; Jovian planet
In a broader sense, includes all four outer planets: Jupiter, Saturn, Uranus, and Neptune. This usage is common in older or less technical contexts.
太陽系の木星型惑星は、木星、土星、天王星、海王星の四つである。
The giant planets in our solar system are Jupiter, Saturn, Uranus, and Neptune.