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In our observable universe, the most common geometric shape is the circle, and by extension the sphere. This is basically all due to gravitation. Large bodies such as planets and stars tend toward spheres. However, they are not perfect spheres. Our own planet Earth for example is not perfectly round, but is rather more accurately described as an oblate spheroid since because of its rotation it is slightly wider at the equator than at the poles. However, the Sun has been observed to be the most close to a perfect sphere than any other object in the universe. Galaxies tend to be circular-shaped disks consisting of the familiar luminous matter of stars and the interstellar medium when viewed face-on. Young stars tend to dominate in the disk. When viewed edge-on, galaxies appear as flat disks surrounded by spherical halos of old stars and the mysterious dark matter. It is also worth noting that the motion of celestial bodies also tends toward a circle or, depending on distance and the strength of gravitation, an ellipse. Rotation about the axis is always circular. Orbital revolution can either be circular or elliptical depending on distance and the strength of gravitation.

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Q: What is the most common geometric shape in the universe?
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