Jupiter's third moon. It is one of the four so-called Galilean moons discovered by Galilei in 1610. It orbits Jupiter about 1,070,000 km from its center in 7.1545 days. It is the largest moon in the solar system, with a diameter of 5,280 km, which is larger than Mercury, but its mass is about 0.026 times that of Earth, less than half that of Mercury. Its surface is thought to be covered in a thick layer of ice, and observations by the Voyager spacecraft have revealed various landforms, including craters. [Sadao Murayama] [Reference] |Jupiter's third moon. Diameter 5,280 km. It is the largest moon in the solar system. Photographed by the Jupiter probe "Galileo" © NASA/JPL "> Ganymede Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
木星の第3衛星。ガリレイが1610年に発見した4個のいわゆるガリレオ衛星の一つである。木星の中心から約107万キロメートルのところを7.1545日で公転している。太陽系最大の衛星であり、直径5280キロメートルで水星よりも大きいが、質量は地球の0.026倍ほどで、水星の半分以下である。表面は厚い氷に覆われていると思われ、ボイジャー探査機の観測でクレーターをはじめいろいろな地形がみいだされた。 [村山定男] [参照項目] |木星の第3衛星。直径5280km。太陽系最大の衛星である。木星探査機「ガリレオ」により撮影©NASA/JPL"> ガニメデ 出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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