Outline of Neptune

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.[a] Neptune orbits the Sun once every 164.8 years at an average distance of 30.1 astronomical units (4.50×10^9 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

• Astronomical object
  • Gravitationally rounded object
    • Planet
      • Giant planet
        • Ice giant
      • Planet of the Solar System
        • Outer planet
        • Superior planet

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
      • Orbit of Neptune

Movement of Neptune

• Orbit of Neptune
• Rotation of Neptune

Features of Neptune

• Atmosphere of Neptune
• Rings of Neptune

Natural satellites of Neptune

• Moons of Neptune

Inner moons of Neptune

• Naiad
• Thalassa
• Despina
• Galatea
• Larissa
• Hippocamp
• Proteus

Retrograde moons of Neptune

• Triton
  • Atmosphere of Triton
  • Climate of Triton
  • Geology of Triton
  • List of geological features on Triton
• Halimede
• Psamathe
• Neso
• S/2021 N 1

Prograde moons of Neptune

• Nereid
• Sao
• Laomedeia
• S/2002 N 5

History of Neptune

History of Neptune

• Discovery of Neptune

Exploration of Neptune

Exploration of Neptune

Flyby missions to explore Neptune

• Voyager 2

Future of Neptune exploration

Proposed missions to explore Neptune

• Interstellar Express
• Neptune Orbiter
• ODINUS
• Trident

See also

• Outline of astronomy
  • Outline of the Solar System
• Outline of space exploration

Notes

1. 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)