Neptune size and scale context

Neptune is the outermost giant planet in the Solar System. It is the windiest world known, with methane-cloud systems racing through its atmosphere at speeds above 2,000 kilometers per hour. Read its scale context, comparisons, and journey links on the canonical object page.

EnceladusIcy ocean moon·500 km

CeresDwarf planet·940 km

IapetusTwo-toned icy moon·1,470 km

PlutoDwarf planet·2,380 km

MoonRocky moon·3,470 km

MercuryTerrestrial planet·4,879 km

MarsTerrestrial planet·6,779 km

EarthTerrestrial planet·12,742 km

NeptuneIce giant planet·49,528 km

JupiterGas giant planet·140,000 km

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Between the smallest and the largest, perspective is everything.

About

Scale of Space is a scroll-based journey through the universe, placing objects on a single logarithmic scale so you can compare size across an unbroken range.

Guides turn parts of that scale into curated essays, while focused views let you explore the same range through specific groups of objects.

Editorial

Solar System Planets From Electron to Atoms Stars To Scale Birth And Death Of Stars Black Holes To Scale

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Planets of the Solar System Stars of the Universe Black holes Subatomic scale

Open Scale of Space Browse all comparisons

Between the smallest and the largest, perspective is everything.

About

Scale of Space is a scroll-based journey through the universe, placing objects on a single logarithmic scale so you can compare size across an unbroken range.

Guides turn parts of that scale into curated essays, while focused views let you explore the same range through specific groups of objects.

Editorial

Solar System Planets From Electron to Atoms Stars To Scale Birth And Death Of Stars Black Holes To Scale

Views

Planets of the Solar System Stars of the Universe Black holes Subatomic scale

Open Scale of Space Browse all comparisons

Planets

Earth

Earth is the rocky planet on which we live and the most familiar anchor for planetary scale. It remains the only world known to host life, with long-lived surface oceans that have shaped both its geology and its atmosphere.

Scale fact12,742 kmdiameter

Object class: Terrestrial planet
Composition: Silicate rock and iron core
Temperature: ~288 K mean surface
Estimated age: ~4.54 billion years
Host: Sun

Planets

Neptune

Neptune is the outermost giant planet in the Solar System. It is the windiest world known, with methane-cloud systems racing through its atmosphere at speeds above 2,000 kilometers per hour.

Scale fact49,528 kmdiameter

Object class: Ice giant planet
Mass: ~17 Earth masses
Host: Sun
Estimated age: ~4.5 billion years
Composition: Hydrogen, helium, water-ammonia-methane ices
Temperature: ~59 K cloud tops

Planets

Jupiter

Jupiter is the largest planet in the Solar System. It is more massive than all the other planets combined and still spins once in only about 10 hours, giving the giant world the shortest day in the planetary family.

Scale fact140,000 kmdiameter

Object class: Gas giant planet
Mass: ~318 Earth masses
Host: Sun
Estimated age: ~4.5 billion years
Composition: Hydrogen and helium
Temperature: ~110 K cloud tops