Solar System Facts

Verified facts about our cosmic home — the Sun, planets, moons, asteroids, comets, and the structure of the solar system.

The Sun Is the Roundest Natural Object in Our Solar System

Precise space-based measurements show the Sun is extraordinarily close to a perfect sphere. Its equatorial and polar diameters differ by only about 10 km (6 mi) across a diameter of roughly 1.39 million km (864,000 mi).

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