Jupiter (Encyclopedia of Science)
Jupiter, the fifth planet from the Sun, is the largest and most massive planet in our solar system. It is 1,300 times larger than Earth, with more than 300 times the mass of Earth and 2.5 times the mass of all the other planets combined. It has a diameter over 88,000 miles (142,000 kilometers), more than eleven times Earth's diameter of 7,900 miles (12,700 kilometers). Lying about 480 million miles (770 million kilometers) from the Sun, Jupiter takes almost 12 years to complete one revolution.
With its 28 moons, Jupiter is considered a mini-solar system of its own. Before the twenty-first century, astronomers believed Jupiter had only 16 moons. But a rash of discoveries soon put the total at 28. The newly discovered satellites are highly different from Jupiter's more well-known moons. They are much smaller, with estimated diameters ranging from 1.8 to 5 miles (3 to 8 kilometers). Also, they have large and eccentric orbits. Some go around Jupiter in a clockwise direction, while others
(The entire section is 1300 words.)
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