What is the mean radius of the Sun in kilometers?
Answer
About 696,000 kilometers
The physical dimensions of the Sun are measured precisely by astronomers, even given its immense scale. The mean radius of the Sun is stated to be approximately 696,000 kilometers. This measurement, when doubled to account for the full width, results in a total diameter of roughly 1.392 million kilometers. This diameter is so large that it allows for a comparison where about 109 Earths could be lined up side-by-side across the Sun's face. The Sun is noted to be nearly a perfect sphere, with only a tiny difference of about 10 kilometers between its equatorial and polar diameters.
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