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Why Are Planets Round?

Solar System
Our Solar System.



Big, small but round.

But, why all the planets and stars are round? 

The eight planets in our solar system differ in many ways. They are of different sizes. They are different distances from the sun. Some are small and rocky, and others are large and gaseous. But all are nice and round. Why is that? Why don't they have cubes, pyramids or discs?

Planets are round because of a process known as "spherical shape formation". This process is caused by the forces of gravity and centrifugal force.


Gravity is the force that pulls all objects towards the center of mass. The stronger the gravity, the more compact an object will be. As a planet forms, the gravity of all the matter within it causes it to pull together and become denser. This results in the planet becoming more and more spherical in shape.


Additionally, as a planet spins on its axis, the centrifugal force caused by this rotation also contributes to the spherical shape. Centrifugal force is the force that pushes objects away from the center of rotation. As a planet spins, the centrifugal force pushes the matter at the equator outwards, making it less dense and causing it to bulge. This bulging effect, combined with the force of gravity, results in the planet having a spherical shape.


In summary, the force of gravity and centrifugal force work together to shape planets into the spherical shape we see today. The gravity of all the matter within a planet causes it to pull together and become more compact while the centrifugal force caused by its rotation results in the bulging at the equator and make it more spherical.


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