What's the Roundest Object in the Universe?
Briefly

The sun, our nearest star, is surprisingly the roundest astronomical object, showcasing minimal deviation from perfect spherical shape, a remarkable feat of nature.
Gravity plays a crucial role in shaping cosmic bodies. As they accumulate mass, their gravitational pull smooths out irregularities, driving them toward spherical forms.
Once objects reach approximately 400 kilometers in diameter, they typically achieve a near-spherical shape, with the largest bodies exhibiting this property across various types.
The roundness of celestial bodies like planets and stars results from gravitational forces that cause irregular formations to collapse into smoother shapes over time.
Read at www.scientificamerican.com
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