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Jupiter


            Jupiter was named for the Roman primary god, Jupiter. Jupiter is the fifth and largest planet in the solar system. Jupiter is 5.2 times farther away from than the Sun than the Earth. On average, it is 480,000,000 miles from the sun. Jupiter doesn't have seasons because seasons are caused by a tilted axis, and Jupiter's axis is only tilted 3 degrees, which is not enough to cause seasons. It takes Jupiter 9.8 Earth hours to revolve around its axis this is a Jovian day. Jupiter's diameter is 88,700 miles. This is a little bit more than 11 times the diameter of the Earth. Jupiter is so big that all the other planets in our Solar System would fit inside Jupiter if it were hollow. Jupiter's mass is about 1.9 x 1027 kg, this is 318 times the mass of the Earth. The gravity on Jupiter is only 254% of the gravity on Earth. This is because Jupiter is such a large planet; a 100-pound person would weigh 254 pounds on Jupiter. It takes 11.86 Earth years for Jupiter to orbit the sun once this is a Jovian year. .
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             Jupiter's atmosphere is composed of about 90% hydrogen and 10 % helium. There are only minute traces (0.07%) of methane (CH3), water, ammonia, and rock dust. The cloud-tops average 120 K = -153°C = -244F. The outer mantle is liquid hydrogen; the inner mantle is liquid metallic hydrogen. At the center of the planet is a molten rock core that is many times bigger and more massive than the entire Earth. It is 20,000 °C, about three times hotter than the Earth's core. Jupiter has four large moons and dozens of smaller ones (there are 39 moons known so far). More moons are being found all the time. Metis is the closest moon to Jupiter. Metis is 25 miles in diameter and orbits 79,500 miles from Jupiter, within its main ring. Stephen Synnott discovered metis in 1980. Adrastea is the second-closest moon to Jupiter. Adrastea is 12 miles in diameter and orbits 80,000 miles from Jupiter, within its main ring.


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