Compare physical diameters. Positions and spacing are illustrative.
All comparisons preserve physical diameter ratios. M and B abbreviate million and billion kilometres.
Solar System planet diameters are equatorial. Added moons use mean diameters and spherical shapes; their axial tilts are not modeled. Exoplanet radii use the IAU nominal Earth radius of 6,378.1 km. Measured spin uses sidereal periods from NASA’s planetary fact sheets. A single time multiplier applies to every body. Atmospheric winds and cloud drift are not modeled. Retrograde rotation is encoded by the tilted spin axis, without reversing it a second time. Starting longitudes and tilt directions are illustrative, not an ephemeris. Triton uses a schematic retrograde axis. Exoplanet spin is left unmodeled rather than inferred from an orbital period.
The Sun uses a 695,700 km radius and a representative 609.12-hour rotation from the NASA Sun fact sheet. The Sun and gas giants rotate differentially; this model uses a single reference period.
Sirius A’s radius is 1.713 ± 0.009 solar radii (Davis et al., 2011). Betelgeuse uses one model estimate of 764 (+116/−62) solar radii (Joyce et al., 2020); its size is uncertain and variable. These distant stars have illustrative surface maps and no simulated spin because a reliable period is not adopted here.
“Largest” and “smallest” are candidates, not settled records. Stellar radii depend on distance, atmosphere models and variability; black hole masses also have measurement uncertainty. Each new object has an adopted estimate and source, available through Details.
Black holes use the Schwarzschild reference horizon diameter, D = 4GM/c², approximately 5.9065 km per solar mass. This assumes no spin; it is not the larger shadow or accretion disk seen in telescope images. The sphere is black, with a faint boundary guide added for visibility. Gravitational lensing and accretion are not simulated. The GW190814 companion may instead have been a neutron star, in which case its displayed horizon would not apply.
Textures by Solar System Scope, licensed under CC BY 4.0. Maps combine imagery and artistic reconstruction; some colors are enhanced. Venus shows its cloud tops, carried at the solid-body rotation rate in this simplified model. Distant stars reuse a tinted solar map for illustration. Lighting, atmosphere glow and stellar brightness are adjusted for visibility.
Added moon maps: NASA/JPL-Caltech/USGS, via the JPL texture library. Io’s color composite and Titan’s haze illustration are by David Seal, NASA/JPL-Caltech. Pluto: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute. These older spacecraft mosaics have variable resolution, grayscale regions and coverage gaps. Exoplanet appearances are procedural illustrations, not resolved images. Full map credits ↗
Drag to orbit in any direction, scroll or pinch to zoom, and right-drag or use two fingers to pan. Click a body or its comparison card to focus. Press F to fit everything, Space to pause, or / to search. Body labels start hidden; enable them under Display settings. Very small objects retain their true sizes even below one pixel; select their cards to inspect them up close.