Neptune
Neptune is an ice giant planet with a deep blue atmosphere, orbiting the Sun beyond Uranus.
49,240 kmMean diameterWorlds apart
Neptune vs Earth
What are they, and what does the difference actually look like?
Two things. One honest scale.
Meet the pair
What these two things are
Earth
Earth is the rocky planet on which we live and the third planet from the Sun.
12,740 kmMean diameterNeptune has about 3.86 times the mean diameter of Earth.
Both marked spans share one linear scale. Artwork keeps its proportions; poses and surface detail are illustrative.
Measurements, assumptions & sources +
Neptune
Mean-radius spherical model for Neptune; actual shape is not perfectly spherical. Gravity refers to a conventional atmospheric level, not solid ground.
NASA JPL — planetary physical parameters
The marked mean diameter is calibrated. Unmeasured illustration details are representative.
Earth
Mean-radius spherical model for Earth; actual shape is not perfectly spherical.
NASA JPL — planetary physical parameters
The marked mean diameter is calibrated. Unmeasured illustration details are representative.
Change the comparison
Put something else beside it.
Measurement details
Why these numbers?
The visual compares mean diameter with mean diameter. The records below preserve each value’s basis and caveats.
Neptune
49,240 kmMean diameter · approximate
Mean-radius spherical model for Neptune; actual shape is not perfectly spherical. Gravity refers to a conventional atmospheric level, not solid ground.
Earth
12,740 kmMean diameter · approximate
Mean-radius spherical model for Earth; actual shape is not perfectly spherical.
- Comparing
- Mean diameter ↔ Mean diameter
- Relative size
- Neptune is larger on this measurement by a factor of about 3.86. Neptune's selected measurement is approximately 286% greater than Earth's.
How to read the visual
The labelled spans and stored measurements determine the scale; unmeasured illustration details do not.
- Neptune is labelled approximate; treat the displayed value as a comparison anchor rather than false precision.
- Earth is labelled approximate; treat the displayed value as a comparison anchor rather than false precision.
There’s always another scale
Follow your curiosity.
SpaceNeptune49,240 kmNeptune is an ice giant planet with a deep blue atmosphere, orbiting the Sun beyond Uranus.SpaceEarth12,740 kmEarth is the rocky planet on which we live and the third planet from the Sun.
SpaceMoon3,475 kmThe Moon is Earth’s natural satellite and the brightest large object in Earth’s night sky.
SpaceJupiter139,800 kmJupiter is a giant planet composed mainly of hydrogen and helium, orbiting the Sun beyond the asteroid belt.
SpaceSun1,391,000 kmThe Sun is the star at the centre of the Solar System.Side by side
Another point of view.
