Scale Comparison
Polaris Aa, the dominant star in the North Star system, is about 46 times the Sun’s diameter.
Polaris Aa is a pulsating Cepheid, so its radius and brightness vary over a cycle of about four days. The plotted diameter is a representative value, not a fixed solid boundary.
Objects
The Sun is the star at the center of the Solar System and the source of almost all the energy reaching its planets. It fuses about 600 million metric tons of hydrogen each second, and energy released in the core takes on the order of 100,000 years to work its way out to the visible surface.
Polaris Aa is the yellow supergiant at the heart of the North Star system and the nearest classical Cepheid to Earth. Cepheids are standard candles for measuring cosmic distances, which makes this nearby example an important calibrator.
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About
Scale of Space is a scroll-based journey through the universe, placing objects on a single logarithmic scale so you can compare size across an unbroken range.
Guides explain selected parts of that range, while focused views filter the objects by subject.