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Jupiter

Jovian MoonsThe Magnetosphere of Jupiter Jupiter is the largest planet in the solar system—a gaseous world as large as 1,300 Earths. Its equatorial diameter is 88,736 mi (142,800 km), w…

Jovian Moons

GanymedeEuropaCallistoIoAmalthea Jupiter has a total of 63 known satellites. The four great moons of Jupiter were discovered by Galileo Galilei (1564–1642) in Jan. 1610, and are called t…

Amalthea

Amalthea, Jupiter's innermost satellite, was discovered in 1892. It is so small—165 mi (265 km) long and 90 mi (150 km) wide—that it is extremely difficult to observe from Earth.…

Io

Io, 2,262 mi (3,640 km) in diameter, is the most spectacular of the Galilean moons. Its brilliant colors of red, orange, and yellow set it apart from any other moon or planet. Active volcanoes have …

Europa

Europa, the brightest of Jupiter's satellites, is about 1,950 mi (3,160 km) in diameter or about the size of Earth's Moon. Its density is about three times that of water. The moon is covered …

Ganymede

Ganymede, 3,275 mi (5,270 km) in diameter, is Jupiter's largest moon, and it is also the largest satellite in the solar system. Ganymede is about one and one-half times the size of our Moon. It is h…

Callisto

Callisto, 2,400 mi (4,800 km) in diameter, is the outermost and, apparently, the least geologically active of Jupiter's four major satellites. Its density is less than twice that of water. Ca…

The Moon

Mercury and Venus do not have any moons. The planet that comes after Earth, Mars, has two very small moons. Jupiter has four major moons and at least 59 minor ones. Saturn, the ringed planet,…

The Magnetosphere of Jupiter

Perhaps the largest structure in the solar system is the magnetosphere of Jupiter. This is the region of space that is filled with Jupiter's magnetic field and is bounded by the interaction of that …

Jupiter

A belt of asteroids (fragments of rock and iron) between Mars and Jupiter separate the four inner planets from the five outer planets. Jupiter, the largest planet in our solar system, was nam…