Scale insight
Scale Comparison
The Sun vs Sirius B, to scale
Sirius B is the clearest nearby reminder that a star can stop being star-sized in the ordinary sense. Next to the Sun, the white dwarf reads as a compact remnant rather than as a smaller version of a living star.
Sirius B used to be the more expansive star. What we see now is the dense remnant left after stellar evolution stripped the system down to a white dwarf no longer comparable to the Sun's broad main-sequence disk.
Set beside the Sun, that history becomes physical rather than abstract. Stellar death can compress a star into something closer to planetary scale while still preserving roughly stellar mass.
Objects
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Sirius B is the white dwarf companion of Sirius A, the brightest star in the night sky. Hubble measurements show it packs about the Sun’s mass into a body smaller than Earth, with gravity so strong that a person would weigh tens of millions of pounds on its surface.
Visual creditscaleofspace.org / CC BY-NC 4.0
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.
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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.