Jupiter
In 1610, Galileo Galilei discovered the four largest moons
of Jupiter—Io, Europa, Ganymede and Callisto (now known as the Galilean
moons)—using a telescope; thought to be the first telescopic observation of
moons other than Earth's.
• Its distance from sun is 778 million kms.
• Revolution period 12 years.
• Rotation period 9h, 50min, and 30 sec. (smallest day)
• It has 63 moons.
• It is the largest planet of the solar system.
• It has the largest number of satellites.
• Its diameter is 1, 24,800 kms.
• Its diameter is eleven times greater than the earth’s diameter.
• It has a dense, cloudy atmosphere of hydrogen and helium.
• It has a rock-iron-ice core about 15, 000 km (9,000 miles) thick.
• Jupiter radiates 67% more heat than it receives from the sun. this is
mainly due to dissipation of the primordial heat of the planet.
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