Hello, I'm an expert in astrophysics with a focus on stellar structures and celestial mechanics. When we talk about the shape of a star, it's important to understand that stars are not perfect geometric shapes like spheres or cubes. Instead, they are plasma bodies governed by the laws of physics, including gravity and pressure.

The actual shape of a star is best described as a spheroid, which is a three-dimensional shape that is roughly spherical but can be slightly flattened at the poles and bulging at the equator. This shape is a result of the balance between the inward pull of gravity and the outward pressure from the nuclear fusion reactions happening in the star's core.

However, it's important to note that stars can exhibit slight irregularities in their shape due to various factors such as rotation, magnetic fields, and the presence of companion stars in binary systems. For instance, a rapidly rotating star can become oblate, meaning it is slightly flattened at the poles.

In summary, while stars are often depicted as perfect spheres for simplicity, their true shape is more complex and influenced by the physical processes occurring within them.

read more >>

However, stars are not exactly spherical in shape. This is because the centrifugal force of the star's rotation is much greater at the equator of the star than it is at the poles because of the rotational velocity. This greater centrifugal force pushes the equator outwards, stretching the star into an oblate shape.read more >>