In the solar system in which we live, planets, moons, stars, and other celestial bodies are all round. Why are the planets round? This seemingly simple question actually contains a mysteries of the universe that are extremely scary.
First, let's take a look at the process of planet formation. In the universe, interstellar matter is gravitationally brought together to form primordial planetary clouds. Over time, the primordial planetary clouds shrank and gradually increased in density, eventually forming a planet.
In this process, the shape of the planet is affected by a variety of factors. One of the most important factors is gravity. According to Newton's law of universal gravitation, the magnitude of gravitational force between two objects is directly proportional to their mass and inversely proportional to the square of the distance between them. Thus, during the formation of the planet, gravity gathers interstellar matter towards the center, forming an almost spherical object.
In addition, the rotation of the planet also has an effect on its shape. Due to the rotation of the planet, the material on its surface is subjected to centrifugal force and gathers in the direction of the equator, forming a slightly flattened ellipsoidal shape.
So, why are planets nearly spherical in shape? This is because during the formation of the planet, the action of gravity and centrifugal force will cause the shape of the planet to gradually tend to be spherical. If the shape of the planet is not spherical, then the material on its surface will be subjected to uneven gravitational and centrifugal forces, causing the material inside the planet to flow and eventually form a more spherical object.
However, behind this seemingly simple question, there is a deeper mystery of the universe. For example, why does the size and density of a planet affect its shape? Why do some planets have halos or moons? These questions need to be further explored and studied.
In short, the question of why the planets are all round, although it seems simple, contains a mysteries of the universe that are extremely scary. Through the study of this problem, we can better understand the nature and evolution of the universe, and provide more clues and ideas for human beings to explore the universe.