Sun
The Sun is the star at the centre of the Solar System.
1,391,000 kmDiameterWorlds apart
Sun vs Neutron star
What are they, and what does the difference actually look like?
Two things. One honest scale.
Meet the pair
What these two things are
Neutron star
A neutron star is the dense remnant core left after a massive star explodes as a supernova, composed mostly of neutrons.
20 kmDiameterSun has about 69,600 times the diameter of Neutron star.
01
Sun1,391,000 kmDiameter
02
Neutron star20 kmDiameter
Inset ×23,800Neutron star is too small to see clearly at this scale. The ring marks its position; only the inset is enlarged.
Measurements, assumptions & sources +
Sun
Our star, modelled with the IAU nominal solar radius. “Surface” means the visible photosphere. The core is much hotter; this is not a solid surface.
IAU — nominal solar and planetary conversion constants
The marked diameter is calibrated. Unmeasured illustration details are representative.
Neutron star
A 20 km, 1.4 solar-mass teaching model. The precise radius depends on stellar mass and the uncertain behaviour of dense matter.
The marked diameter is calibrated. Unmeasured illustration details are representative.
Change the comparison
Put something else beside it.
Measurement details
Why these numbers?
The visual compares diameter with diameter. The records below preserve each value’s basis and caveats.
Sun
1,391,000 kmDiameter · approximate
Our star, modelled with the IAU nominal solar radius. “Surface” means the visible photosphere. The core is much hotter; this is not a solid surface.
Neutron star
20 kmDiameter · representative
A 20 km, 1.4 solar-mass teaching model. The precise radius depends on stellar mass and the uncertain behaviour of dense matter.
- Comparing
- Diameter ↔ Diameter
- Relative size
- Sun is larger on this measurement by a factor of about 69,600.
How to read the visual
The labelled spans and stored measurements determine the scale; unmeasured illustration details do not.
- Sun is labelled approximate; treat the displayed value as a comparison anchor rather than false precision.
- Neutron star is labelled representative; treat the displayed value as a comparison anchor rather than false precision.
There’s always another scale
Follow your curiosity.
SpaceSun1,391,000 kmThe Sun is the star at the centre of the Solar System.SpaceNeutron star20 kmA neutron star is the dense remnant core left after a massive star explodes as a supernova, composed mostly of neutrons.
SpaceEarth12,740 kmEarth is the rocky planet on which we live and the third planet from the Sun.
SpaceJupiter139,800 kmJupiter is a giant planet composed mainly of hydrogen and helium, orbiting the Sun beyond the asteroid belt.
SpaceEarth–Sun distance1 AUThe Earth–Sun distance, or astronomical unit, is the standard measure of separation between Earth and the Sun used in astronomy.
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.Side by side
Another point of view.
