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Sources: https://www.universetoday.com/112805/why-is-everything-spherical/
Why are things round in universe?
Have you noticed that a good portion of things in space are shaped like a sphere? Stars, planets, and moons are all spherical.
It all comes down to gravity. All the atoms in an object pull towards a common center of gravity, and they’re resisted outwards by whatever force is holding them together.
Inside a glass of water, you would see individual molecules trying to fit in as close as they can. Tension making the top of the water smooth and even.
Now, let us imagine a planet made entirely of water. If there were no winds, it would be perfectly smooth. The water molecules on the north pole are pulling towards the molecules on the south pole. The ones on the left are pulling towards the right. With all points pulling towards the center of the mass you would get a perfect sphere.
Gravity and surface tension pull it in, and molecular forces are pushing it outward. If you could hold this massive water droplet in an environment where it would remain undisturbed, eventually the water would reach a perfect balance. This is known as “hydrostatic equilibrium”.
Stars, planets and moons can be made of gas, ice or rock. This accumulation of enough mass in one area, and it’s going to pull all that stuff into a roughly spherical shape. Less massive objects, such as asteroids, comets, and smaller moons have less gravity, so they may not pull into perfect spheres.
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