The distance from a star's center to its visible surface (photosphere), typically measured in solar radii or kilometers. This fundamental stellar property varies dramatically among different types of stars, from tiny white dwarfs to enormous supergiants.
From Latin 'stella' meaning star and 'radius' meaning spoke of a wheel or ray. The astronomical usage developed as astronomers began measuring stellar sizes in the 19th and 20th centuries using interferometry and other techniques.
Stellar radius reveals the incredible diversity of cosmic architecture! While the Sun could fit over a million Earths inside it, the supergiant star UY Scuti is so large that if placed at our Sun's position, it would engulf the orbit of Jupiter.
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