“Ganymede”的概念、定义、翻译、参考文献-科学参考

Ganymede

Astronomy

The largest satellite of Jupiter, and the largest in the Solar System, at 5262 km in diameter; also known as Jupiter III. Ganymede orbits Jupiter in 7.155 days at a distance of 1 070 400 km. Its period of axial rotation is the same as its orbital period. Ganymede is the brightest of the Galilean satellites, reaching magnitude 4.6 at opposition. It has a surface rich in water ice and a mean density of 1.94 g/cm³, indicating that just over half its composition is rock. Irradiation of the surface ice by ultraviolet light and atomic particles is thought to generate the moon’s tenuous oxygen atmosphere. Ganymede’s surface is a mixture of high-albedo (young, smooth) and darker (older, more heavily cratered) terrains. The brighter regions are crossed by linear flow-like features called sulci, thought to result from partial resurfacing by ice followed by stretching and faulting. Some of the larger impact craters have become palimpsests due to slow, glacial flow of the ice. Ganymede has a weak magnetic field with a strength of 750 nT at the surface, about 40 times weaker than that of the Earth.

Space Exploration

The largest moon of the planet Jupiter, orbiting every 7.2 days at a distance of 1.1 million km. It is the largest moon in the Solar System, 5 260 km in diameter (larger than the planet Mercury). Its surface is a mixture of extensively cratered and grooved terrain. Molecular oxygen was identified on Ganymede's surface in 1994. It is thought that Ganymede has a water ice crust and possibly a buried water ocean.
The space probe Galileo detected a magnetic field around Ganymede in 1996; this suggests it may have a molten core. Galileo photographed Ganymede at a distance of 7 448 km. The resulting images were 17 times clearer than those taken by Voyager 2 in 1979.

Geology and Earth Sciences

One of the Galilean satellites, and the largest jovian satellite; it is bigger than Mercury and Pluto. It is believed to have a rock and metal core surrounded by a large mantle of water or water ice, 800–900 km thick, and the surface is of ice, with two types of terrain, one very cratered and dark, the other rather lighter, with many grooves and ridges. These terrains result from tectonic activity, but the details are not known. Both terrains are extensively cratered, the craters being flat, with no ring mountains and central depressions, and suggest the surface is about 3–3.5 Ma old. Ganymede has a magnetic field, embedded within that of Jupiter. Ganymede was discovered in 1610 by Simon Marius and Galileo. Its diameter is 5268 km; mass 1.48 × 10²³ kg; mean density 1940 kg/m³; visual albedo 0.42; mean distance from Jupiter 1.07 × 10⁶ km.

单词	Ganymede
释义	Ganymede Astronomy The largest satellite of Jupiter, and the largest in the Solar System, at 5262 km in diameter; also known as Jupiter III. Ganymede orbits Jupiter in 7.155 days at a distance of 1 070 400 km. Its period of axial rotation is the same as its orbital period. Ganymede is the brightest of the Galilean satellites, reaching magnitude 4.6 at opposition. It has a surface rich in water ice and a mean density of 1.94 g/cm³, indicating that just over half its composition is rock. Irradiation of the surface ice by ultraviolet light and atomic particles is thought to generate the moon’s tenuous oxygen atmosphere. Ganymede’s surface is a mixture of high-albedo (young, smooth) and darker (older, more heavily cratered) terrains. The brighter regions are crossed by linear flow-like features called sulci, thought to result from partial resurfacing by ice followed by stretching and faulting. Some of the larger impact craters have become palimpsests due to slow, glacial flow of the ice. Ganymede has a weak magnetic field with a strength of 750 nT at the surface, about 40 times weaker than that of the Earth. Space Exploration The largest moon of the planet Jupiter, orbiting every 7.2 days at a distance of 1.1 million km. It is the largest moon in the Solar System, 5 260 km in diameter (larger than the planet Mercury). Its surface is a mixture of extensively cratered and grooved terrain. Molecular oxygen was identified on Ganymede's surface in 1994. It is thought that Ganymede has a water ice crust and possibly a buried water ocean. The space probe Galileo detected a magnetic field around Ganymede in 1996; this suggests it may have a molten core. Galileo photographed Ganymede at a distance of 7 448 km. The resulting images were 17 times clearer than those taken by Voyager 2 in 1979. Geology and Earth Sciences One of the Galilean satellites, and the largest jovian satellite; it is bigger than Mercury and Pluto. It is believed to have a rock and metal core surrounded by a large mantle of water or water ice, 800–900 km thick, and the surface is of ice, with two types of terrain, one very cratered and dark, the other rather lighter, with many grooves and ridges. These terrains result from tectonic activity, but the details are not known. Both terrains are extensively cratered, the craters being flat, with no ring mountains and central depressions, and suggest the surface is about 3–3.5 Ma old. Ganymede has a magnetic field, embedded within that of Jupiter. Ganymede was discovered in 1610 by Simon Marius and Galileo. Its diameter is 5268 km; mass 1.48 × 10²³ kg; mean density 1940 kg/m³; visual albedo 0.42; mean distance from Jupiter 1.07 × 10⁶ km.
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