Atmosphere
Mostly hydrogen and helium with methane.
Acquiring mission data
Apex AndromedaApex AndromedaAcquiring mission data
Planet 08 · Ice giant
The farthest planet, running the fastest winds.
Neptune is the densest giant planet and the only one discovered through mathematics before direct observation. Its deep blue atmosphere, internal heat, violent storms, and captured moon Triton make it much more active than its distance from the Sun suggests.
World profile
Mostly hydrogen and helium with methane.
No solid surface; the atmosphere merges into hot dense water, methane, and ammonia fluids above a rocky core.
Cloud tops average about −330 °F (−200 °C)
A system led by captured Kuiper Belt object Triton
Composition
Field notes
Neptune was predicted from disturbances in Uranus's orbit before it was identified in a telescope.
Its clouds move faster than 1,200 miles per hour (2,000 kilometers per hour), the strongest winds measured on a planet.
Triton orbits backwards, strong evidence that Neptune captured it from the Kuiper Belt.
Sourced image archive
Every image keeps its credit, capture date, description, and original source. Mission imagery links back into the same Andromeda mission catalog.
Mission imagery
Voyager 2's last whole-planet frames show the Great Dark Spot, Scooter, and high-altitude bright clouds before the 1989 encounter.
Connected mission archive
Flybys, orbiters, landers, atmospheric probes, rovers, launch missions, gravity assists, and system satellites are linked here when they exist in the Andromeda catalog.
Open mission browser →1 linked missions · showing 1–1
Associations use destination records plus a curated cross-world manifest for flybys and gravity assists. Mission-name collisions such as Project Mercury and Saturn launch vehicles are deliberately kept with Earth unless they actually visited the planet. Technically obvious; historically necessary.
Primary facts source
NASA Science · Neptune facts ↗
Community discussion
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