Why are giant celestial objects shaped like spheres?

Feel the necessity of the topic : Have you ever noticed that every giant object in space is perfectly or near a sphere in shape? But why only spheres? Why not other shapes like triangular solid, cone, torus, rectangular cuboid etc. or any irregular shapes? In this blog, you’re going to learn the reasons behind the common shape “Sphere” of every giant celestial object. Let’s go….

Let’s learn some key points that will help us to understand the topic clearly:

What is Gravity?: Gravity can be defined as a force by which an object can draw anything towards self. Albert Einstein described gravity as a curve in space that wraps around an object (Sun, Planets, black hole etc.). If any other object passes through the curvature it’ll be pulled towards the bottom of the curve. This is caused by the gravitational force of the object. Gravitational force of an object depends on the mass held by the object. The higher the mass of the object, the higher the gravity.

 

The gravitational force is given by the following formula:  Fa=Fb= G x Mm/(R)^2  But the direction of Fa and Fb are opposite in nature. So we can say that any body attracts any object towards its Centre of mass or Centre of gravity.

The reason behind the unique "Sphere" shape:

We’ve seen before that the gravitational force is felt towards the centre of mass of a body. Every single particle of every object gets attracted towards the centre of mass of that object itself and this causes

a circle in 2D and sphere in 3D roughly (See the pictures below). A question may arise! Since every object

attracts its own particle towards its center of mass then why the earthly objects are not sphere in shape? Not only

earthly things but also some objects in space are also not spheres in shape. Cause a minimum gravitational force

is needed to  squeeze all the particles of the object into a sphere and these lite weighted earthly bodies or some

small asteroids in space are not sphere or near a sphere cause they’re unable to produce that minimum

gravitational force that can squeeze all the particles of the object in a sphere. Small and lite weighted objects

don’t have huge gravitational force because they’ve small mass that forms the body. Objects with huge mass

with huge gravitational force only tend to become a roughly or perfectly sphere. The interstellar objects like the

Sun, Moon, Planet Earth and other planets are very close to spheres in shape because of their huge mass

and huge gravitational force towards the canter.