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Neptune is the fourth largest planet in the Solar System, and is the most distant official planet that orbits the Sun. It is considered one of the "gas giants" because it is composed mainly of gases, and lacks a solid, rocky crust like Earth.
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Fast Facts
- Discovered on September 23, 1846
- Discovered by three scientists: Urbain Le Verrier, John Couch Adams and Johann Galle
- Named after the Roman god of the ocean.
- Radius: 24,764 kilometers (3.8 times Earth's radius)
- Circumference: 155,597 kilometers
- Surface area: 7.64 million square kilometers (14.9 times Earth's)
- Mass: 1.02x1026 kilograms (17.1 times Earth's)
- Average distance from the Sun: 4.49 billion kilometers
- 13 known moons in its orbitNASA-JPL: Neptune - Facts & Figures
- : 80.0%
- : 19.0%
- : 1.5%
- Trace amounts of Hydrogen Deuteride, EthaneNASA: Neptune Fact Sheet
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Astronomical Surprise
Neptune's existence was mathematically-predicted by Galileo between 1612 and 1613—more than two hundred years before it was visually confirmed. However, Galileo believed that the object accounted for in his calculations was a fixed star. Astronomers didn't discover that Neptune was in fact a planet until 1846.NASA-JPL: Neptune - Overview -
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Nine Planets: Neptune Facts
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Window To The Universe: Beginner, Intermediate, and Advanced Neptune Information
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Wikipedia: Neptune
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NASA: Neptune Worldbook
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Space Today Online: It's Springtime on Planet Neptune
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Thinkquest: Introduction to Neptune
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Nine Planets: Neptune Facts
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Neptune on Twitter Powered by Twitter
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Volumes on the up: Monthly volumes reach year high at Neptune Orient Lines, but rates still remain weak. http://bit.ly/GbaIM
@tradewindsnews | November 10, 2009 01:57 AM -
couldn't find the latino building and i was too lazy to keep looking.. welppp back to neptune.
@afreee | November 10, 2009 01:35 AM -
RT @astrogrrl: Moon oppose Neptune. Don't doubt the self. Express yourself freely. Hopefulness even in the midst of sadness or trying times
@revizion | November 10, 2009 01:28 AM -
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Neptune on Amazon | View All
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Dogs are from Neptune - $16.95
The new wave of excluding aversives and training with positive reinforcement is rapidly proving itself to not only be the method of choice for adding behavior, but now, as evidenced by trainers like Jean Donaldson, the method of choice f...
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Neptune Avenue: A Jack Leightner Crime Novel (Detective Jack Leightner) - $24.95
“If we took it all personally,” Brooklyn South homicide detective Jack Leightner tells his rookie NYPD partner, “there’s no way we could do the job.” <p s...
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Questions and Answers About Neptune | View All | Ask a Question
View All Neptune Questions (3) | Ask a QuestionHow were Uranus, Neptune, and Pluto discovered by scientist? (1 Answer)In short: Uranus was discovered by sight, Neptune and Pluto by deductive reasoning. Let´s see it how all was done: http://www.universetoday.com/wp-content/uploads/2008/09/william_herschel01.jpg William Herschel Uranus was legaly discovered in March 1781 ... read more
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