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Planet Neptune Moons: 13 (and growing) Mass: 17 times the mass of Earth Diameter: 30,775 miles Year: 164 Earth years Day: 16.1 hours Temperature: -235 degrees F Distance from the Sun: 8th planet from the sun, 2.8 billion miles What is Neptune like? Neptune is the eighth and furthest planet from the sun. Neptune's atmosphere gives it a blue color which is fitting with it being named after the Roman god of the sea. Neptune is a gas giant, meaning that its surface is gas rather than a hard rocky surface like earth. Neptune is slightly smaller than its sister planet Uranus making it the 4th largest planet. However, Neptune is a little bit larger in mass than Uranus making it the 3rd largest planet by mass. Neptune's atmosphere is mostly made up of Hydrogen with a smaller amount of Helium. The surface of Neptune swirls with huge storms and powerful winds. One large storm was photographed by Voyager 2 when it passed by Neptune in 1989. It was called the Great Dark Spot. The storm was as big as the size of the earth! Neptune has 13 known moons. The largest of Neptune's moons is Triton. Neptune also has a small ring system similar to Saturn, but not nearly as large or as visible. How does Neptune compare to Earth? Since Neptune is a gas giant planet, there is no rocky surface to walk around on like earth. Also, Neptune is so far away from the sun that, unlike earth, it gets most of its energy from its inner core rather than from the sun. Neptune is much, much bigger than earth. Even though much of Neptune is gas, its mass is 17 times that of Earth's. How do we know about Neptune? Neptune was first discovered by mathematics. When astronomers found that the planet Uranus did not follow their predicted orbit around the sun, they figured out that there must be another planet that was pulling on Uranus with gravity. They used some more mathematics and found out where Neptune should be. In 1846, they were finally able to see Neptune through a telescope and verify their mathematics. The only space probe to visit Neptune was Voyager 2 in 1989. By using the close up pictures from Voyager 2, scientists were able to learn a lot about Neptune. For more information on the Solar system: The Solar System The Sun Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune Pluto Back to Kids Study Page Back to Ducksters Kids Home Page

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