The following outline is provided as an overview of and topical guide to Neptune:
Neptune – eighth and farthest known planet from the Sun in the Solar System. In the Solar System, it is the fourth-largest planet by diameter, the third-most-massive planet, and the densest giant planet. Neptune is 17 times the mass of Earth and is slightly more massive than its near-twin Uranus, which is 15 times the mass of Earth and slightly larger than Neptune.[lower-alpha 1] Neptune orbits the Sun once every 164.8 years at an average distance of 30.1 astronomical units (4.50×109 km). It is named after the Roman god of the sea and has the astronomical symbol ♆, a stylised version of the god Neptune's trident.
Classification of Neptune
Location of Neptune
- Milky Way Galaxy – barred spiral galaxy
- Orion Arm – a spiral arm of the Milky Way
- Solar System – the Sun and the objects that orbit it, including 8 planets, the eighth and furthest planet from the Sun being Neptune
- Orion Arm – a spiral arm of the Milky Way
Movement of Neptune
Features of Neptune
Natural satellites of Neptune
Inner moons of Neptune
Retrograde moons of Neptune
Prograde moons of Neptune
History of Neptune
Exploration of Neptune
Flyby missions to explore Neptune
Future of Neptune exploration
Proposed missions to explore Neptune
See also
Notes
- ↑ Neptune is denser and physically smaller than Uranus because Neptune's greater mass gravitationally compresses the atmosphere more.
References
External links
- NASA's Neptune fact sheet
- Neptune from Bill Arnett's nineplanets.org
- Neptune Astronomy Cast episode No. 63, includes full transcript.
- Neptune Profile at NASA's Solar System Exploration site
- Planets – Neptune A children's guide to Neptune.
- Merrifield, Michael; Bauer, Amanda (2010). "Neptune". Sixty Symbols. Brady Haran for the University of Nottingham.
- Neptune by amateur (The Planetary Society)
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