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Neptune is the eighth and farthestplanet from theSun in theSolar System. It is anice giant. It is the fourth-largest planet in the system.

Neptune'smass is 17 timesEarth's mass and a little bit more thanUranus' mass. Neptune is denser and smaller than Uranus. Its greater mass makes itsgravity make itsatmosphere smaller anddenser.

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

Neptune's atmosphere is mostlyhydrogen andhelium. It also contains small amounts ofmethane which makes the planet appear blue. Neptune'sblue color is much darker than the color ofUranus. 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 andJohn Couch Adams were theastronomers who discovered Neptune. Neptune was not discovered using atelescope. It was the first planet to be discovered usingmathematics. In 1821, astronomers saw thatUranus' 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 onlyspacecraft 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 otherspace probes have been planned.

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

"Yellow" is a song by Englishalternative rock bandColdplay. The band wrote the song andco-produced it with Britishrecord producerKen Nelson. It was for their first albumParachutes. The song's lyrics are a reference to band vocalistChris Martin's(pictured) unreturned love. The song was released across the world in June 2000. Helped byheavy rotation and usage in promotions, the song made the band very popular. It remains one of the band's most popular songs.