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Solar System Observatory
Enter a 3D lineup built from NASA equatorial diameters. Every globe shares one physical size scale, from the Sun at about 109 Earth-widths down to Mercury at 0.38. The gaps are compressed so the comparison remains explorable.
Compare eight familiar Milky Way stars on one physical radius scale—from tiny Proxima Centauri to the pulsing red supergiant Betelgeuse. Labels keep the smallest stars findable while their glowing surfaces remain scientifically scaled.
Use Fit all stars for the full scale shock, select any star for a close inspection, or launch the guided journey from red dwarf to supergiant. Optional orbit rings show where Mercury, Earth, Mars, and Jupiter would sit on the same scale.
Approximate stellar properties compiled from NASA's Universe glossary, NASA's Betelgeuse guide, and ESA Hipparcos. The deep-sky environment uses ESA/Gaia/DPAC EDR3 data (CC BY-SA 3.0 IGO); the Sun's EUV view is NASA/GSFC/SDO AIA 171 imagery. Evolved-star sizes vary by method and time.
Drag to orbit. Scroll or pinch to cross millions of kilometers. Right-drag or two-finger drag to pan. Select any world in space or from the target rail.
Planetary surface maps by Solar System Scope (CC BY 4.0), based on NASA imagery and elevation data. Earth night lights: NASA/GSFC. Deep sky: ESA/Gaia/DPAC EDR3 (CC BY-SA 3.0 IGO). Solar EUV imagery: NASA/GSFC/SDO.
Soundscapes: Space and Ambient Space 7, used under the Pixabay Content License.