Scale Comparison
Sirius A is a main-sequence star about 1.7 times the Sun’s diameter.
Sirius A has about twice the Sun’s mass and is much hotter and more luminous. The size difference comes from comparing two main-sequence stars, not an ordinary star with an evolved giant.
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.
Sirius A is the brightest star in Earth’s night sky and the luminous primary of the Sirius binary. The same system also contains Sirius B, a white dwarf.
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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.