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The moons of the planet Jupiter have a total of 79. For 53 of them have names, but the rest have not.

Jupiter is the largest planet in Solar system we. No wonder this gas monster also has many moons.

Jupiter almost qualifies as the Solar System itself. Most of the moons are small, with about 60 satellites less than 6.2 miles in diameter.

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Most of the moon was discovered in the late 1970s. Then the results of this exploration are based on observations of automated spacecraft, such as NASA’s Voyager in 1979 and Galileo in 1995.

Knowing Jupiter’s Moons, Orbit Period From 7 Hours To 3 Earth Years

Not only the largest planet, but Jupiter is also the most massive. The mass of the planet is more than 300 Earth masses.

Jupiter has a large number of moons, due to its large area of ​​gravitational stability. The magnetic field is strong, making any asteroid-like object that passes nearby be crushed.

Unlike Earth, it lacks the strong gravitational and mass fields needed to hold other satellites in orbit.

Jupiter’s moons have different orbital periods. Ranging from 7 hours to almost 3 Earth years. The nearest orbit is nearly circular, while the farthest moon has an irregular orbit.

Jupiter’s outer moons orbit in the opposite direction to Jupiter’s rotation. This indicates that the moons were partly asteroids sucked toward Jupiter.

Galilee Satelit satellitesHAI

Jupiter’s 4 Galilean satellites are faint points of light in astronomers’ telescopes. The Pioneer and Voyager spacecraft missions provide a wealth of information.

Then in 1610, the Italian astronomer Galileo Galilei discovered Jupiter’s four moons. Initially, the names of Jupiter’s moons were numerically I, II, III, and IV.

Over the centuries the numerical names were renamed to Io, Europa, Ganymede, and Callisto. These 4 Galilean satellites were first discovered and became the object of the most scientific interest.

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In history astronomy, Galileo’s discovery became an important point. This is because these observations reveal that not all celestial bodies revolve around the Earth.

At that time, Earth was considered the center of the universe. 4 Galileo and the small dust-like moons near Jupiter make up Jupiter’s rings.


Jupiter’s moon is the most cratered object in the Solar System. Basically, the moon’s landscape has not changed since it was first formed.

Because its orbit is furthest from the planet and outside the main radiation belt, it will experience the impact of Jupiter’s magnetic field.


Ganymede is Jupiter’s largest moon. Jupiter’s moons are the only moons in the Solar System that have their own magnetic field.

Although this satellite is as large as Mercury, its density is only half. Even the most active volcanic object besides Earth.

The moon’s iron core is covered in thick crust. Then the surface of Ganymede as much as 40% is covered by dark areas of high craters.

Then the rest is covered with light grooved fields. Then it forms a fairly complex pattern throughout Ganymede.


The moon Europa is one of the brightest in our Solar System. Its entire surface consists almost of water and ice.

Europa has streaks and cracks all over the surface of the ice. This is indicated by the presence of a small crater.

In addition, the moon of the planet Jupiter on this one has a high level of reflectivity. So much so that it makes it one of the brightest moons in the Solar System.

The surface is quite young at the age of 20-180 million years. It is possible that the vast ocean beneath its surface contains life.


The first moon Galileo discovered had a volcano. Then this moon became the only celestial body besides Earth that had volcanic activity.

Interestingly, the moon Io has sulfur dioxide snow fields. Its composition leads to characteristics as a ball of fire and ice. Then Io has an iron or iron sulfide core.

Even the outer layer of silicate is brown. This will give Io the appearance of patches of orange, black, yellow, red, and white.

Jupiter’s moons are known as the Galilean satellites, number 4. The number of moons on Jupiter makes the solar system look like a miniature Solar System. (R10 / HR-Online / Editor-Ndu)


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