Earth
12,740 km - Mean diameter; approximate.
Earth is the rocky planet on which we live and the third planet from the Sun.
Mean-radius spherical model for Earth; actual shape is not perfectly spherical.
NASA JPL — planetary physical parametersEarth vs Neutron star: diameter comparison
The mean diameter of Earth is about 637 times the diameter of a neutron star. Selected basis: a representative value for Neutron star; approximate values.
- Earth
- Mean diameter
- Neutron star
- Diameter
Earth
12,740 kmMean diameter
0 - shared origin
Neutron star
20 kmDiameter
0 - shared origin
The ring marks the true-scale position of a neutron star; it does not show its width. Only the inset is enlarged (×203).
Both rulers start at the same zero and share one linear scale. Artwork keeps its original proportions.
In perspective637 times
Measurements, assumptions & sources
Neutron star
20 km - Diameter; representative.
A neutron star is the dense remnant core left after a massive star explodes as a supernova, composed mostly of neutrons.
A 20 km, 1.4 solar-mass teaching model. The precise radius depends on stellar mass and the uncertain behaviour of dense matter.
NASA — Neutron stars
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There’s always another scale
Follow your curiosity.
SpaceEarth12,740 kmEarth is the rocky planet on which we live and the third planet from the Sun.
SpaceNeutron star20 kmA neutron star is the dense remnant core left after a massive star explodes as a supernova, composed mostly of neutrons.
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.
SpaceWhite dwarf12,000 kmA white dwarf is the dense, hot remnant core left behind after a star like the Sun has exhausted its nuclear fuel and shed its outer layers.
Fundamental physicsProton1.682 fmA proton is a positively charged particle found in the nucleus of atoms, made up of quarks.A closer look
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Side by side
Another point of view.
Illustrative artwork · not to scale
Illustrative artwork · not to scale
Illustrative artwork · not to scale
Illustrative artwork · not to scaleGot a good eye for scale?