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This is the front page of the Simple English Wikipedia. Wikipedias are places where people work together to write encyclopedias in different languages. We use Simple English words and grammar here. The Simple English Wikipedia is for everyone, such as children and adults who are learning English. There are 280,304 articles on the Simple English Wikipedia. All of the pages are free to use. They have all been published under both the Creative Commons Attribution/Share-Alike License 4.0 International License and the GNU Free Documentation License. You can help here! You may change these pages and make new pages. Read the help pages and other good pages to learn how to write pages here. If you need help, you may ask questions at Simple talk.

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Neptune is the eighth and farthest planet from the Sun in the Solar System. It is an ice giant. It is the fourth-largest planet in the system.

Neptune's mass is 17 times Earth's mass and a little bit more than Uranus' mass. Neptune is denser and smaller than Uranus. Its greater mass makes its gravity make its atmosphere smaller and denser.

It was named after the Roman god of the sea, Neptune. Neptune's astronomical symbol is ♆, the trident of the god Neptune.

Neptune's atmosphere is mostly hydrogen and helium. It also contains small amounts of methane which makes the planet appear blue. Neptune's blue color is much darker than the color of Uranus. Neptune also has the strongest winds of any planet in the Solar System, as high as 2,100 km/h or 1,300 mph.

Urbain Le Verrier and John Couch Adams were the astronomers who discovered Neptune. Neptune was not discovered using a telescope. It was the first planet to be discovered using mathematics. In 1821, astronomers saw that Uranus' orbit was different from what they expected. Another nearby planet's mass was changing Uranus' orbit. They found Neptune was the cause.

Voyager 2 visited Neptune on 25 August 1989. It was the only spacecraft to visit the planet. Neptune used to have a huge storm known as the "Great Dark Spot". Voyager 2 discovered the spot in 1989. The dark spot was not seen in 1994, but new spots were found since then. It is not known why the dark spot disappeared. Visits by other space probes have been planned.

Neptune has five rings. These rings are hard to see from the Earth.

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2009 Royal Rumble match winner Randy Orton in 2018
2009 Royal Rumble match winner Randy Orton in 2018

The 2009 Royal Rumble was a professional wrestling pay-per-view event made by World Wrestling Entertainment (WWE). It took place on January 22, 2009 at the Joe Louis Arena in Detroit, Michigan. It was the 22th Royal Rumble event held by WWE. The event featured the Royal Rumble match as the main event, which Randy Orton (pictured) won. 450,000 paid to see the event.

Did you know...

From a collection of Wikipedia's articles:

Jamie Lee Curtis in 2018

  • ... that Academy Award-winning actress Jamie Lee Curtis (pictured) did not want to be called Baroness Haden-Guest because she said the title has nothing to do with her?
  • ... that the Japanese spider crab has the largest leg span among any arthropod in the world?
  • ... that at age 37, Simon Harris is the youngest person to become Ireland's Taoiseach?
  • ... that Kirby's Dream Course was not originally going to be a Kirby game, and the version without Kirby was later released on the Satellaview?
  • ... that Manhattan Project member and Nobel Prize winner Richard Feynman is said to have helped uncover the reasons behind the Space Shuttle Challenger disaster?
  • ... that 14% of the adults living in the United States have problems in their everyday life, because they cannot read and write well enough?
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