Khám phá ganymede


Ganymede is the seventh moon of dòng jupiter and the third of the Galilean moons. It is the largest moon in the solar system & is larger than the planet Mercury & dwarf planet Pluto. Ganymede is only slightly smaller than Mars and if it were orbiting the Sun rather than Jupiter, it would be classified as a planet itself.

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Ganymede was discovered by Galileo Galilei on 7 January 1610 along with the three other Jovian moons Europa, Io và Callisto. Together they are referred to as the Galilean moons. The discovery of these four Galilean satellites are what eventually led lớn the understand that the planets in the solar system were orbiting the Sun và that Earth was not the centre of the solar system.

Size of Ganymede compared khổng lồ Jupiter

Side by side comparison of the kích thước of đời xe yamaha jupiter vs it’s moon Ganymede

Facts about Ganymede

If Ganymede were orbiting the Sun it would be a planet.

Ganymede is larger than both Mercury và Pluto, và is 2/3 the kích thước of Mars with a diameter of 5,268 km (3,273 miles) – 8% larger than Mercury. It has the highest mass of all planetary satellites & has more than twice the mass of the Earth’s Moon.

The moon is named after a Trojan prince in Greek mythology.

Originally called dòng xe jupiter III by Galileo, Ganymede was named after a suggestion from German mathematician và astronomer Johannes Kepler. In the Greek story Zeus, a counterpart of jupiter in Roman mythology, carried the prince Ganymede to Olympus, where he became a cupbearer for the Olympian gods.

It takes Ganymede 7.1 Earth days to lớn orbit dòng yamaha jupiter at a speed of 39,165 km/h.

The moon orbits at 39,165 km (24,321 miles) an hour và takes 7.15455296 Earth days to lớn complete its orbit around Jupiter. Like most moons in the solar system, Ganymede is tidally locked to đời xe jupiter and one side is always facing the planet. Interestingly, for every orbit of Ganymede, Europa orbits đời xe jupiter twice & Io orbits four times.

Ganymede is the only moon in the solar system known to lớn have its own magnetic field.

It is believed that the magnetosphere of Ganymede is likely to lớn have been created through convection within the liquid iron core of the moon. The field is very small though & is barely noticeable because it is buried within Jupiter’s much larger magnetic field.

The moon is composed of equal amounts silicate rock and water ice and has several layers.

Ganymede is made of rocky material & water ice. It has a metallic iron and iron sulfide core which is surrounded by a rocky mantle and a very thick icy crust.

There may be an ocean layer of liquid water beneath the surface of Ganymede.

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An study published in năm trước suggests that there might be a stack of several saltwater ocean layers separated by different phases of ice as far as 124 miles below the surface of Ganymede. The lowest liquid layer may be right next lớn the rocky mantle below and could be sign for sustainable life on Ganymede.

40% of Ganymede’s surface is covered with highly cratered dark regions.

These dark regions are believed khổng lồ be from heavy impact by asteroids or comets and date back khổng lồ around 4 billion years ago. The lighter regions of the moon’s surface are not quite so old and cover the rest of Ganymede. The cause of the light terrain’s disrupted geology is though khổng lồ be the result of tectonic activity caused by tidal heating – a build up of friction, orbital và rotational energy that are dissipated as heat in the crust of the moons và planets involved.

Ganymede has a thin atmosphere than contains oxygen.

The moon has a very thin atmosphere & it does contain small amounts of oxygen but there is not enough to support any form of life.

Six spacecraft have visited Ganymede since 1973.

Pioneer 10 and 11 were launched in March 1972 & April 1973 respectively và made successful flybys of Ganymede in December 1973 & December 1974. They sent back limited data with blurry images of the moon. Voyager 1 và 2 returned much more high quality and detailed images in 1979 which showed the grooved terrain and also discovered that Ganymede was larger than first thought – replacing Saturn’s moon Titan as the largest satellite in the solar system.

The Galileo spacecraft in 1995 passed as low as 162 miles (261 km) over the surfaces of the Galilean moons, sending back a lot of new data such as the discovery of the magnetic field, the ocean beneath Ganymede’s surface, và the highest resolution close up images of the moon.

Finally, New Horizons in 2007 sent back images và made topography và composition maps of Ganymede before continuing on towards Pluto và the Kuiper Belt.

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