What causes objects in space to be spherical shaped?

Objects in space become spherical due to the force of gravity, which pulls matter toward a central point. When an object reaches a certain size, its gravitational force becomes strong enough to overcome the rigidity of its material, allowing it to collapse into a shape where all points on the surface are equidistant from the center. This equilibrium shape minimizes potential energy, resulting in a sphere. Additionally, larger celestial bodies may also exhibit slight deviations from perfect sphericity due to rotation and other forces.