Jisho

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もくせいがたわくせい 木星型惑星
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Noun
1. gas giant (Jupiter, Saturn)​Astronomy, See also 天王星型惑星
Noun
2. giant planet (Jupiter, Saturn, Uranus, Neptune); Jovian planet​Astronomy
Wikipedia definition
3. Gas giant​A gas giant (sometimes also known as a jovian planet after the planet Jupiter, or giant planet) is a large planet that is not primarily composed of rock or other solid matter. There are four gas giants in the Solar System: Jupiter, Saturn, Uranus, and Neptune. Many extrasolar gas giants have been identified orbiting other stars. Planets above 10 Earth masses are termed giant planets. Lower-mass gassy planets are sometimes called "gas dwarfs".
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Read “木星型惑星” on Japanese Wikipedia
Read “Gas giant” on DBpedia

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