Scale insight
Scale Comparison
The Sun vs Polaris Aa, to scale
Polaris is famous as a navigational marker, but on a true diameter scale it is better understood as an evolved supergiant star. Next to Polaris Aa, the Sun becomes the much smaller reference star hidden behind the familiarity of the North Star.
Shared physical scale
35.9million km
Polaris is culturally familiar in a way that can obscure its physical reality. The North Star sounds like a fixed point of orientation, yet the object itself belongs to a much larger stellar class than the Sun.
Seeing the scale difference directly reconnects the sky marker to stellar evolution. Polaris Aa is not just a famous direction-finder. It is a large evolved star with a very different physical footprint from our own.
Objects
Open each object in context
The Sun is the star at the center of the Solar System and the engine behind every climate and orbit within it. It fuses about 600 million metric tons of hydrogen each second, while photons created in the core can take roughly 250,000 years to work their way 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. Because Cepheids act as standard candles for measuring cosmic distances, this pulsating star is far more than a navigation marker: it is one of astronomy’s key calibration beacons.
Visual creditscaleofspace.org / CC BY-NC 4.0
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Between the smallest and the largest, perspective is everything.
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 turn parts of that scale into curated essays, while focused views let you explore the same range through specific groups of objects.