Scale insight
Scale Comparison
The Sun vs Stephenson 2 DFK 49, to scale
Stephenson 2 DFK 49 sits in the uncertain, extreme upper end of stellar size estimates, which is exactly why the comparison must stay careful. Even with that caution, true scale still makes one thing obvious: the object belongs to a vastly larger stellar regime than the Sun.
Shared physical scale
891million km
Stephenson 2 DFK 49 sits near the limit of what stellar size estimates can mean cleanly. It is not a tidy sphere with a universally agreed edge, but it still occupies an extreme scale far beyond the Sun's stable disk.
That is the right way to read the page: not as a claim of perfect precision, but as an honest look at how enormous the most inflated red supergiants may become. The uncertainty is part of the lesson, not a reason to avoid the comparison.
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.
Stephenson 2 DFK 49 is an extreme red supergiant whose quoted size remains highly uncertain because its outer layers are diffuse and difficult to define. Even so, plausible estimates make it so enormous that its photosphere could approach or even engulf Jupiter’s orbit if placed at the center of the Solar System.
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.