| http://www.w3.org/ns/prov#value | - The two largest, Jupiter and Saturn, are composed mainly of hydrogen and helium; the two outermost planets, Uranus and Neptune, are composed largely of ices, such as water, ammonia and methane, and are often referred to separately as ice giants".You can learn Solar System Planet Atlas in text with more than 1,000 photos and YouTube movies.(Language:text is Japanese only. )You can also view pictur
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