(outer-most solar system planet)
Neptune is the outer-most known planet in the Solar System.
- 30 AU - orbital radius.
- 17 Earth masses.
- 3.85 Earth radii.
Among the solar system planets,
it is easily most similar to Uranus,
with a slightly larger mass and a slightly smaller radius.
Neptune has 14 Moons, of which one, Triton, is substantial.
Triton has a retrograde orbit, suggesting it is a captured Minor Planet.
Pluto and Neptune have a 3:2 Orbital Resonance.
The only mission to fly near Neptune was Voyager 2 in 1989.
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Astronomical Unit (AU)
Equilibrium Temperature (Teq)
Kuiper Belt (K Belt)
Late Heavy Bombardment (LHB)
Solar Mass (MSun)
Outer Solar System Origins Survey (OSSOS)
Trans-Neptunian Object (TNO)